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    Wyświetlanie 1-11 z 11
    Tytuł:
    Analysis of prognosis of lowland river bed erosion based on geotechnical parameters
    Autorzy:
    Smaga, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/178854.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    CPTU
    relative density
    bed erosion
    river flow
    Opis:
    The river erosion is a complex process, the dynamics of which is very difficult to predict. Its intensity largely depends on hydraulic conditions of the river channel. However, it is also thought that natural resistance of the subsoil has a great influence on the scale of the erosion process. Predicting the effects of this process is extremely important in the case of constructing a piling structure (for example, artificial reservoirs). The partition of the river channel causes significant lowering of the river channel bed downstream the dam which threatens the stability of hydro technical and engineering (bridges) buildings. To stop this unwanted phenomenon, stabilizing thresholds are built. However, random location of thresholds significantly reduces their effectiveness. Therefore, taking under consideration natural geotechnical conditions of the subsoil appears to be extremely important. In the light of the current development of in-situ tests in geotechnics, an attempt to use results from these tests to predict the bed erosion rate was made. The analysis includes results from CPTU and DPL tests, which were carried out in the Warta River valley downstream the Jeziorsko reservoir. In the paper, the general diagrams for the procedure of obtaining and processing the data are shown. As a result, the author presents two multidimensional bed erosion rate models built based on hydraulic data and results from CPTU or DPL tests. These models allow taking more effective actions, leading to the neutralization of the effects of the intensive bed erosion process.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 4; 57-63
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of functional cluster analysis of CPTU data for assessment of a subsoil rigidity
    Autorzy:
    Młynarek, Z.
    Wierzbicki, J.
    Wołyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/178174.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    CPTU
    cluster analysis
    functional data
    rigidity model
    Opis:
    This paper shows an example of the grouping of piezocone penetration test (CPTU) characteristics using functional data analysis, together with the results of clustering, in the form of a subsoil rigidity model. The subsoil rigidity model was constructed based on layer separation using the proposed method, as well as the k-means method. In the construction of the subsoil rigidity model, the constrained modulus M was applied. These moduli were determined from empirical relationships for overconsolidated and normally consolidated soils from Poland based on cone tip resistance.
    Źródło:
    Studia Geotechnica et Mechanica; 2018, 40, 2; 117-124
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geotechnical parameters of alluvial soils from in-situ tests
    Autorzy:
    Młynarek, Z.
    Stefaniak, G.
    Wierzbicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241228.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    silty soils parameters
    strength
    deformation
    CPTU
    SDMT
    Opis:
    The article concentrates on the identification of geotechnical parameters of alluvial soil represented by silts found near Poznań and Elbląg. Strength and deformation parameters of the subsoil tested were identified by the CPTU (static penetration) and SDMT (dilatometric) methods, as well as by the vane test (VT). Geotechnical parameters of the subsoil were analysed with a view to using the soil as an earth construction material and as a foundation for buildings constructed on the grounds tested. The article includes an analysis of the overconsolidation process of the soil tested and a formula for the identification of the overconsolidation ratio OCR. Equation 9 reflects the relation between the undrained shear strength and plasticity of the silts analyzed and the OCR value. The analysis resulted in the determination of the Nkt coefficient, which might be used to identify the undrained shear strength of both sediments tested. On the basis of a detailed analysis of changes in terms of the constrained oedometric modulus M0, the relations between the said modulus, the liquidity index and the OCR value were identified. Mayne’s formula (1995) was used to determine the M0 modulus from the CPTU test. The usefullness of the sediments found near Poznań as an earth construction material was analysed after their structure had been destroyed and compacted with a Proctor apparatus. In cases of samples characterised by different water content and soil particle density, the analysis of changes in terms of cohesion and the internal friction angle proved that these parameters are influenced by the soil phase composition (Fig. 18 and 19). On the basis of the tests, it was concluded that the most desirable shear strength parameters are achieved when the silt is compacted below the optimum water content.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 1-2; 63-81
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usefulness of the CPTU method in evaluating shear modulus G0 changes in the subsoil
    Autorzy:
    Młynarek, Zbigniew
    Wierzbicki, Jędrzej
    Lunne, Tom
    Powiązania:
    https://bibliotekanauki.pl/articles/1845148.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    shear modulus G0
    CPTU
    non-cohesive soil
    Opis:
    This article contains the analysis of the correlation between the cone resistance qc from CPTU tests and shear modulus G0 determined from seismic tests SDMT and SCPTU. The analysis was performed for sands located in Poland, characterised by differential grain size distribution and origin. The significant impact of the independent variables; grain size, preconsolidation stress σ’p, geostatic vertical stress σ’v0 and relative density index on the dependencies analysed, were examined in three stages. Firstly, a general relationship between the cone resistance and shear modulus G0 was established; in the second stage, an analysis was carried out in selected groups of subsoil; and in the third stage, the influence of other independent variables was taken into account. In each stage, the functional form of the dependency was determined, and their statistical significance was assessed throughout coefficient of determination R2. For more variables, multivariable regression analysis was applied for assessment. Conducted analysis showed that the overall view of the relation between the cone resistance qc and shear modulus G0 has low evaluation of the statistical significance. This fact is consistent with the theoretical assessment of this relationship. To obtain a satisfactory assessment of this dependency, it is necessary to construct empirical equations for individual groups of soil, taking into account other independent variables; preconsolidation stress σ’p, vertical stress σ’vo and relative density index. This approach allows to assess the local correlation relationship, which is very useful during the geological project.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 3; 195-205
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft Soil Overconsolidation and CPTU Dissipation Test
    Autorzy:
    Bałachowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/241488.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    CPTU
    DMT
    pore pressure
    stress history
    soft soil
    Opis:
    Stress state and stress history of subsoil under the flood embankment was evaluated with CPTU and DMT tests. The CPTU dissipation tests in soft soils under the central part of the embankment and on the upstream and downstream sides were performed. The shape of pore water dissipation curve reflects stress state and stress history. Monotonic decay of water pore pressure was found for normally consolidated soils. Dilatory pore pressure response is typical for overconsolidated soils. Methods for the flow characteristics determination (coefficient of consolidation and hydraulic conductivity) were presented.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 2; 155-180
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective friction angle of deltaic soils in the Vistula Marshlands
    Autorzy:
    Międlarz, Kamila
    Konkol, Jakub
    Bałachowski, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/178633.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    angle of internal friction
    CPTU
    triaxial testing
    soft soils
    peat
    Opis:
    This article presents the results of laboratory tests on soft, normally consolidated soils from the Vistula Marshlands. Samples of high-plasticity organic soils (muds) taken from 3.2–4.0 m and 9.5–10.0 m depth, as well as peat deposit at 14.0 m, are analysed. Presented case study confirms the applicability of the Norwegian Institute of Technology (NTH) method based on Cone Penetration Tests (CPTU) and allows for a conservative estimation of effective friction angle for muds. The plastification angle equal to 14.5° for organic silt, applied in the modified NTH method, fits well the triaxial test (TX) results. Moreover, the dilative-contractive behaviour according to the CPTU soil classification based on the Robertson’s proposal from 2016 corresponds well with volumetric changes observed in the consolidated drained triaxial compression tests. The internal friction angles of the Vistula Marshlands' muds and peats are lower in comparison with the database of similar soft soils.
    Źródło:
    Studia Geotechnica et Mechanica; 2019, 41, 3; 143-150
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deep compaction control of sandy soils
    Autorzy:
    Bałachowski, L.
    Kurek, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/178341.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vibrocompaction
    CPTU
    sands
    soil behaviour type
    piaski
    gleby piaszczyste
    zagęszczanie wibracyjne
    Opis:
    Vibroflotation, vibratory compaction, micro-blasting or heavy tamping are typical improvement methods for the cohesionless deposits of high thickness. The complex mechanism of deep soil compaction is related to void ratio decrease with grain rear-rangements, lateral stress increase, prestressing effect of certain number of load cycles, water pressure dissipation, aging and other effects. Calibration chamber based interpretation of CPTU/DMT can be used to take into account vertical and horizontal stress and void ratio effects. Some examples of interpretation of soundings in pre-treated and compacted sands are given. Some acceptance criteria for compaction control are discussed. The improvement factors are analysed including the normalised approach based on the soil behaviour type index.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 2; 3-8
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Landslide investigations by static sounding with pore pressure measurements (CPTU), ground penetration radar techniques (GPR) and other chosen methods
    Autorzy:
    Bednarczyk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186179.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    badanie osuwisk
    testy geotechniczne
    testy in situ
    testy laboratoryjne
    sondowania statyczne CPTU
    badania georadarowe
    pomiary GPS
    landslide investigations
    geotechnical in situ and laboratory tests
    CPTU
    GPR
    GPS
    Opis:
    The main subject of the paper is the practical application of the existing geotechnical and geo-environmental engineering techniques for the purpose of ground characterisation in landslide areas. Special interest is given to the landslide issues in difficult geotechnical and geological conditions and evaluation of soil design parameters by in situ tests. In the paper, usage of CPTU connected with reference laboratory tests, GPR and other monitoring techniques in landslide and potential landslide areas are presented. Research was based on investigations in Polish opencast mines, Carpathian flysch sediments and Norwegian clays. Presented data are based on the exemplar landslide projects. The background of presented CPTU studies is slope stability evaluations of the Polish opencast brown coal mines undertaken during a research stay at the Norwegian University of Science and Technology (NTNU) with support of the Norwegian Research Council and NATO Advanced Fellowship Programme. Landslide investigations by GPR and GPS technique were performed on Carpathian flysch sediments in Lachowice and Wapienne (Poland).
    Źródło:
    Polish Geological Institute Special Papers; 2004, 15; 19-28
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identyfikacja sprawności funkcjonowania systemu drenażu pierścieniowego
    Determination of efficiency of the circumferential drainage system
    Autorzy:
    Kroll, M.
    Stefaniak, K.
    Walczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/400138.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    drenaż pierścieniowy
    filtracja
    CPTU
    test dyssypacji
    osady poflotacyjne
    circumferential drainage
    permeability
    dissipation test
    tailings
    Opis:
    Jedną z możliwości poprawy współczynnika stateczności nasypu budowlanego jest obniżenie położenia krzywej filtracji. W wyniku tego zabiegu uzyskuje się mniejsze siły masowe uruchamiające potencjalny zsuw oraz korzystniejsze parametry wytrzymałościowe gruntów, które przeciwdziałają ruchom osuwiskowym. W przypadku składowisk odpadów obniżenie krzywej filtracji wód uzyskuje się poprzez budowę studni odciążających i piętrowych systemów drenażowych, spełniających wytyczne bezpiecznej eksploatacji obiektu. Celem niniejszej pracy jest wskazanie metody umożliwiającej monitoring rzeczywistego położenia krzywej filtracji w masywie składowanych osadów oraz ocena sprawności działania drenażu pierścieniowego składowiska. W pracy podjęto próbę wykorzystania do tego celu metody statycznego sondowania CPTU. Badanie CPTU umożliwia pomiar dyssypacji ciśnienia wody w porach gruntu, identyfikując warunki drenażu, które porównuje się z wynikami obserwacji piezometrycznych. Wyniki tego rodzaju badań umożliwiły kontrolę zmian położenia krzywej depresji wód nadosadowych w zaporach oraz określenie sprawności funkcjonowania systemu drenażu pierścieniowego.
    One of the potential alternatives to improve the stability coefficient for an embankment structure is to flatten the filtration curve. As a result, we obtain lower body forces triggering the potential landslide and more advantageous soil strength parameters, which counteract landslide movements. In the case of waste dumps lowering the phreatic surface of waters is achieved thanks to the construction of auxiliary drainage systems, meeting the guidelines for their safe operation. The aim of this paper is to indicate a method facilitating the determination of the actual position of the phreatic surface within the deposited sediments and the assessment of efficiency of the circumferential drainage system in the waste dump. It was decided in this study to apply cone penetration test CPTU. The CPTU made it possible to measure dissipation of excess water pressure in pores identifying drainage conditions, which were compared with the results of piezometric measurements. The results of these tests made it possible to monitor changes in the position of the depression curve of supernatant waters in dams and to determine the efficiency of the circumferential drainage system.
    Źródło:
    Inżynieria Ekologiczna; 2015, 45; 68-74
    2081-139X
    2392-0629
    Pojawia się w:
    Inżynieria Ekologiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka lessów lubelskich jako podłoża budowlanego
    Characteristics of the Lublin loess as a building subsoil
    Autorzy:
    Nepelski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2076162.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    parametry sondowania
    testy ciśnieniomierzy
    CPTU
    DMT
    typy facji lessowych
    less
    pressuremeter tests
    loess facies types
    loess
    Opis:
    The loess subsoil constitutes over 50% of the Lublin area and determines the geotechnical conditions of the western side of the River Bystrzyca. The paper discusses the geological structure of this part of Lublin and presents an analysis of the results of field research carried out by the author. The research methodology and the method of deriving parameters for the loess subsoil are also proposed. The Lublin loesses were divided into three main facies groups: aeolian (typical loess), aeolian-diluvial and aeolian-alluvial. The basis for the division and parametric characteristics of individual facies were mainly in-situ tests: CPT/CPTU static soundings, DMT/SDMT flat dilatometer tests and PMT Menard pressuremeter tests. The collected data allowed characterizing each of the facies groups and developing a synthetic geological cross-section representing the geological structure of the western part of Lublin. The number of analysed tests allowed stating that the data from CPT/CPTU static soundings are representative for Lublin. Data from DMT/SDMT tests can be considered representative, but further research is needed to refine them and, for example, to separate them by facies. Data from pressuremeter tests should be treated as preliminary. The analyses show that the most common facies in Lublin is silty aeolian one called typical loess, which, according to the author, constitutes approximately 75-80%, and their parameters are of key importance for the design of buildings. The remaining facies groups are about 8-15% for aeolian-diluvial loess and 8-10% for aeolian alluvial loess. Typical loesses are macroscopically homogeneous, but their varying stiffness is reflected in in-situ tests. The basic research method for loess subsoil should be CPT/CPTU static soundings, while the most representative parameter for geotechnical layers is the cone resistance qc. Details of the geological structure and parameters should be performed with DMT, SDMT and PMT tests, as well as laboratory tests, the necessary scope of which can be determined after the development of the subsoil model from the results of CPT tests.
    Źródło:
    Przegląd Geologiczny; 2021, 69, 12; 835--849
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the cone penetration resistance obtained in static and dynamic field tests
    Porównanie oporów penetracji stożka uzyskiwanych w sondowaniach statycznych i dynamicznych
    Autorzy:
    Czado, B.
    Pietras, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/348715.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    badania polowe gruntu
    sondowanie statyczne
    CPT
    CPTU
    DP
    DPH
    sondowanie dynamiczne
    field tests of soil
    cone penetration test
    dynamic probing
    Opis:
    Soil field testing performed with the static method of CPT/CPTU is increasingly being used in Poland to examine the ground for the purposes of foundation design. The results of this test may be used directly in the calculations of foundation piles, but also of spread foundations. The use of a static test becomes problematic when coarse soils (sandy gravels, gravels) are found in the subsoil. In these situations a dynamic probing may be performed to supplement the results of CPT in the soil strata where the CPT examination is impossible. This requires the development of appropriate correlation between the soil parameters obtained in static (qc) and dynamic tests (qd). This paper presents an analysis of the results of field tests conducted in Kraków, Poland. Results were obtained in the test nodes, which included: cone penetration test (CPT), dynamic probing (DPH) and a borehole. The derived correlations were compared with the results of similar studies performed in Hungary and Lithuania.
    Sondowanie statyczne metodą CPT/CPTU jest co raz częściej stosowane w Polsce do rozpoznania podłoża pod obiekty budowlane. Wyniki tego badania można wykorzystać w bezpośredni sposób przede wszystkim do projektowania pali fundamentowych, ale także fundamentów bezpośrednich. Zastosowanie sondy statycznej staje się problematyczne, gdy w podłożu zalegają grunty gruboziarniste (pospółki, żwiry). W takich sytuacjach można zastosować sondę dynamiczną i uzupełnienie wyniki badania CPT dla warstw, gdzie przeprowadzenie badania CPT jest niemożliwe. Wymaga to jednak opracowania odpowiednich korelacji pomiędzy parametrami qc i qd. Artykuł przedstawia analizę wyników badań przeprowadzonych w węzłach badawczych, obejmujących sondowanie statyczne CPT, sondowanie dynamiczne DPH oraz otwór wiertniczy. Prezentowane są uzyskane zależności pomiędzy oporem statycznym qc, a dynamicznym qd. Uzyskane korelacje porównano z wynikami podobnych prac przeprowadzonych na Węgrzech oraz na Litwie.
    Źródło:
    AGH Journal of Mining and Geoengineering; 2012, 36, 1; 97-105
    1732-6702
    Pojawia się w:
    AGH Journal of Mining and Geoengineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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