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    Wyświetlanie 1-8 z 8
    Tytuł:
    Crack tortuosity in swelling clay soils
    Autorzy:
    Chertkov, V.Y.
    Ravina, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/24125.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    planar tortuosity
    tortuousity
    swelling soil
    clay soil
    soil
    spatial tortuosity
    crack network
    Źródło:
    International Agrophysics; 1999, 13, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crack width, cross-section area, and volume in swelling clay soils
    Autorzy:
    Chertkov, V.Y.
    Ravina, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/26102.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    shrinkage
    swelling soil
    clay soil
    geometry
    crack formation
    width
    crack
    water content
    Źródło:
    International Agrophysics; 1999, 13, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of bearing capacity effect in swelling soil
    Autorzy:
    Mohammed, A. N.
    Khalil, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174193.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    grunt nawodniony
    nośność gruntu
    ciśnienie pęcznienia gruntu
    swell pressure
    swelling soil
    bearing capacity
    water content
    dry unit weight
    Opis:
    The current study aims to investigate the effects of swell pressure on the bearing capacity of swelling soil. A model and some laboratory tests have been created to investigate the swell pressure effect on the bearing capacity variation of soil swelling due to swelling pressure. The influence of varying water content [...] and dry unit weight [...] on the shear strength and swelling pressure was studied. The soil has been taken from Diwan Residential Compound-Mosul. It is classified as highly swelling soil. The swell pressure of soils at their natural water content reached [...]. Experiment results show that the parameters of shear resistance decreased with the [...] wcincrease at the constant value of [...], and increased with the [...] increase when the [...] was constant. Results show that the swelling pressure decreased with the wc increase, while it increased with the [...] increase. Also, the results obtained using was model show that the resistance of bearing capacity of pre-saturated selected soil was [...], while the bearing capacity was [...] when taking into account in the generation of swelling pressure.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 167--178
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heave analysis of shallow foundations founded in swelling clayey soil at N’Gaous city in Algeria
    Autorzy:
    Khennouf, Abdelaziz
    Baheddi, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/1845129.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    clayey soil
    swelling
    analytical approach
    foundation heave
    numerical modelling
    Opis:
    The design of shallow foundations on swelling soils needs a thorough study to evaluate the effect of swelling potential soil on the final foundation heave. For this reason, a simple analytical approach based on the soil stress state under the foundation can be used to calculate the foundation heave. This paper reports a set of analytical and numerical analysis using the finite-difference code (FLAC 3D), performed on an isolated shallow foundation founded on a swelling soil mass at N’Gaous city in Batna Province, Algeria, subjected to distributed vertical loads. Further, the influence of some parameters on total heave was analyzed, such as the embedded foundation and soil stiffness. The analysis results from the proposed 3D modelling was compared and discussed with analytical results. The numerical results obtained show a good agreement with the analytical solutions based on oedometer tests proposed in the literature, and deliver a satisfactory prediction of the heave of the shallow foundations.
    Źródło:
    Studia Geotechnica et Mechanica; 2020, 42, 3; 210-221
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of swell index and swelling pressure from suction tests : a case study of Neogene clays from Warsaw (Poland)
    Autorzy:
    Wójcik, E.
    Gawriuczenkow, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060572.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    expansive soils
    swell index
    swelling pressure
    soil suction
    neogene clays
    Opis:
    The paper presents the results of swell index, swelling pressure and soil suction tests carried out on Neogene clays from Warsaw, depending on the water content, clay fraction, liquid limit, plasticity index, cation exchange capacity, and content of clay minerals and beidellite. These clays are considered expansive soils in Poland, as they are vulnerable to water content variations in the active zone, which result in their volume change and, in consequence, cause damage of foundations and other construction elements. A number of physical, chemical and mineral properties were determined for these clays. The swelling tests were carried out on samples precompacted in Proctor apparatus, at various initial values of water content. The analyses have shown exponential relation of swell index, swelling pressure and suction versus water content. In addition, the investigated relationship between the suction and swell characteristics of tested clays shows good correlation as a power function between these parameters. In addition, validity of correlations between fitting parameters of obtained relationships and soil index properties, such as clay fraction, liquid limit, plasticity index, cation exchange capacity, and content of clay minerals and beidellite, have been demonstrated. The empirical relations are characterized by high values of the correlation coefficient. A very high fit has also been found for a proposed relationship between the swell index and swelling pressure for tested clays.
    Źródło:
    Geological Quarterly; 2017, 61, 4; 738--750
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Volumetric behavior of natural swelling soil on drying-wetting paths. Application to the Boumagueur marl -Algeria-
    Autorzy:
    Mebarki, Mehdi
    Kareche, Toufik
    Benyahia, Sabah
    Derfouf, Feth-Ellah Mounir
    Abou-Bekr, Nabil
    Taibi, Said
    Powiązania:
    https://bibliotekanauki.pl/articles/1845135.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    suction
    shrinkage
    swelling
    drying-wetting
    undisturbed soil
    slurry
    volumetric behavior
    Opis:
    This article presents the results of experimental work carried out both in situ (coring; pressuremeter test) and in the laboratory (drying-wetting and oedometric tests) to describe the volumetric behavior on drying-wetting path of a swelling clayey soil of eastern Algeria. In order to perform drying-wetting tests the osmotic technique and saturated salts solutions were used. These suction-imposed methods have gained widespread acceptance as reliable methods for imposing suction on soil specimens. They allowed to sweep a wide range of suctions between 0 and 500 MPa. The ability to impose suction on soil specimens allows for drying and wetting stress paths to be applied to evaluate resulting changes in state parameters (void ratio, degree of saturation and water content). These paths were carried out on specimens with different initial states. Slurries of soil were used to characterize the reference behavior, while the undisturbed soil samples allow to describe the behavior of material under in situ conditions. In the last part of this article and to specify the behavior observed in the saturated domain, a comparison between the resulting deformations of the drying-wetting test and those resulting from the oedometric test was made.
    Źródło:
    Studia Geotechnica et Mechanica; 2020, 42, 3; 248-262
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strength regain in soil aggregate beds by swelling and shrinkage
    Autorzy:
    Seguel, O.
    Horn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/24243.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    precompression stress
    shrinkage
    bulk density
    soil structure
    cohesion
    swelling
    aggregate bed
    friction angle
    soil aggregate
    strength regain
    Źródło:
    International Agrophysics; 2006, 20, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of biofertilizers on protein, moisture and ash content in relation to swelling property, water absorption capacity, mineral elements, total phenolic level of Stevia (Stevia rebaudiana Bert.) plant grown under acidic soil zone of South India
    Autorzy:
    Das, K.
    Dang, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/11022.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    biofertilizer
    protein
    moisture
    ash content
    swelling property
    physicochemical property
    phenol
    water absorption
    absorption capacity
    mineral element
    total phenolics level
    atomic absorption spectrometry
    stevia
    Stevia rebaudiana
    plant growth
    acid soil zone
    South India
    India
    Opis:
    The field experiment on Stevia rebaudiana (SR), (Family: Asteraceae) was carried out in acid soil zone of Shimoga (Karnataka) in the year 2009 and 2010 to investigate the influence of biofertilizers on protein, moisture and ash content in the dried Stevia leaf and their correlation with swelling property, water absorption capacity and mineral element contents. Results revealed that second harvested sample (August) in first year (2009) was better for all aspects than other harvested samples and the results showed significant increase in protein content (16.22 %), swelling index (SI) (5.10 % w/w), water absorption capacity (WAC) (4.91 ml/g) with the treatment T8 where three bio fertilizers were applied togetherly with simultaneous moisture content varied from 6.61 to 7.18 %. The significant higher correlations were observed (significant at 1 %) between protein content with SI (r = 0.99), WAC (r = 0.99) and SI with WAC (r = 0.98) in 2009 harvested samples. The ash content was higher in third harvested sample (13.54 %) in the year 2009 with simultaneous increased amount of Fe (6.19 mg/kg), Mn (1.24 mg/kg), Cu (0.72 mg/kg) and Zn (1.22 mg/kg) contents due to the residual effect of bio fertilizers. Nitrogen (0.74 mg/kg), P (0.40 mg/kg) and K (0.68 mg/kg) contents were higher during second harvested samples and thereafter decreased. Total phenolic content was also recorded highest (64.52 mg/g) with three bio fertilizers applied togetherly during year 2009 compared to the year 2010 (50.12 mg/g). The results suggest that the application of bio-fertilizers either single or more numbers in a balanced way may be beneficial in improving protein, phenol and mineral contents of stevia plant.
    Źródło:
    International Letters of Natural Sciences; 2014, 01
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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