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Tytuł:
Numerical simulation on mining effects of upper coal seam on lower coal seam of splitting area of splitting and merging coal seam
Symulacja numeryczna efektów wydobywania węgla w górnym pokładzie węgla na dolny pokład węgla na obszarze rozszczepienia w pokładzie o cechach rozszczepienia i scalania
Autorzy:
Zha, W. H.
Hua, X. Z.
Xiong, L. J.
Huang, R.
Powiązania:
https://bibliotekanauki.pl/articles/348696.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
rozszczepienie i scalanie
naprężenia stropu
prawo pęknięć
symulacja numeryczna
splitting and merging
floor stress
failure law
numerical simulations
Opis:
The main mining coal seams 71 and 72 of Huaibei mine area show a relation between splitting and merging. Under the slicing mining circumstance of the splitting area, it is the key problem to face the mining area to ensure the safety of the lower 72 coal mining. Based on face 7225 of Xutuan Coal Mine the influence of 71 coal seam mining on the coal seam 72 was analyzed by the FLAC3D. The law of stress propagation in the floor, failure extent and movement during the mining of coal seam 71 and coal seam 72 were studied by the numerical simulation; it provides the basis for roof management and support selection of 72 coal seam mining.
Główne pokłady węglowe nr 71 i 72 kopalni Huaibei wykazują cechy zarówno rozszczepienia, jak i scalania. Podczas wybierania warstwowego na obszarze rozszczepienia głównym problemem jest zapewnienie bezpieczeństwa dolnego pokładu nr 72. Na przykładzie przodka 7225 kopalni Xutuan przeanalizowano wpływ wydobycia w pokładzie nr 71 na pokład nr 72 przy użyciu programu FLAC3D. Propagację fal naprężeń w spągu, zakres pęknięcia i przesunięcia podczas wybierania pokładu węgla nr 71 i 72 zbadano za pomocą symulacji numerycznej, co daje podstawy do lepszej kontroli stropu i do wyboru obudowy pod wybieranie pokładu węgla nr 72.
Źródło:
AGH Journal of Mining and Geoengineering; 2012, 36, 3; 471-479
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CO2-ECBM and CO2 sequestration in Polish coal seam – experimental study
Autorzy:
Baran, P.
Zarębska, K
Krzystolik, P
Hadro, J.
Nunn, A.
Powiązania:
https://bibliotekanauki.pl/articles/91967.pdf
Data publikacji:
2014
Wydawca:
Główny Instytut Górnictwa
Tematy:
coal
sorption
sequestration
carbon dioxide
methane
ECBM
węgiel
sorpcja
sekwestracja
dwutlenek węgla
metan
Opis:
Purpose: Methane recovery is interesting not only because of its clean combustion; it is also beneficial for the environment because of the reduction of the amount of methane emitted into the atmosphere, which is important because of methane’s significant impact on the greenhouse effect. However, desorption of methane is a slow process, significantly dependent on the coalification of coal, its porosity and petrographic composition. Injection of carbon dioxide into the coal bed under sufficient pressure might be a factor in stimulating the efficiency of this process, as – because of preferential sorption – carbon dioxide displaces methane molecules previously absorbed in the coal matrix. Methods: The measurements were made for Polish low-rank coal used for the analysis of methane recovery from Polish coal mines. Coal samples were collected from sites used for geological, sorption and petrographic research, as well as for the assessment of the reservoir’s genetic origin CH4 content. Experimental studies of sorption were performed with the use of the volumetric method at a lower and higher gas pressure. Results: The methane isothermes show more than double the reduction of adsorption along with increasing temperature. The most sig-nificant changes of sorption capacity due to temperature variations can be seen when observing the difference in the course of the hysteresis of sorption/desorption of the gas as a function of temperature. In cases where there is a temperature of 323 K, a temperature hysteresis loop might indicate larger quantities of methane trapped in the porous structure of coal. In cases of carbon dioxide as sorbate, a similar shape of sorption isotherms occurred at both temperatures, while the temperature increase caused approximately double the reduction of sorption capacity. Also the isotherm’s shape is similar for both temperatures of measurement, indicating no effect of temperature on the amount of gas within the structure of the tested coal. High-pressure isotherms of CO2 and CH4 are confirmed in the literature, proving that carbon dioxide is the gas that allows the best penetration of the internal structure of bituminous coal. The critical temperature of CO2 (304.5 K) is so high, that sorption measurements can be performed at room temperatures (293, 298 K), where activated diffusion is relatively fast. Practical implications: Understanding the sorption of gases is the primary issue, related to the exploitation of coal seams, when explaining the mechanism of gas deposition in coal seams and its relationship with outbursts of rocks and gases in mines. Originality/ value: The results indicate successful sorption of carbon dioxide in each experiment. This provides the rationale to study the application of the coal tested to obtain methane genetic origin genetic methane with the use of the CO2 injection.
Źródło:
Journal of Sustainable Mining; 2014, 13, 2; 22-29
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case study: Mechanism and effect analysis of presplitting blasting in shallow extra-thick coal seam
Autorzy:
Sun, Qiang
Shan, Chegfang
Wu, Zhongya
Wang, Yunbo
Powiązania:
https://bibliotekanauki.pl/articles/2203332.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pokłady węgla
wydobycie węgla
węgiel
szhallow-buried thick coal seam
hard roof and coal seam
fully mechanised top coal caving mining
blasting presplitting
parameter optimisation
Opis:
The caving effect of the top coal caving is crucial for efficient mining. Using the Yushuling coal mine, Xinjiang province, China, as a case study, the coal and rock physical and mechanical parameters, such as the compressive, tensile, and shear strength values and hardness of the top coal and roof rock, were determined. The analysis of the effect of different factors on the blasting presplitting process was numerically simulated, and the optimal parameters of blast drilling were identified. Three presplit boreholes were implemented: in the workface, the workface’s advance area, and the two roadway roofs in the workface’s advance area. The optimal blasting drilling parameters and charge structure were designed. The field test results in the mine under study indicated that the top coal recovery rate of the 110501 fully mechanised top coal caving face was improved twice (from 40 to more than 80%), and an effective blasting presplitting was achieved. The proposed blasting presplitting method has an important guiding significance for fully mechanised top coal caving mining in Xinjiang and similar mining areas.
Źródło:
Archives of Mining Sciences; 2022, 67, 3; 381--399
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In-situ coal seam and overburden permeability characterization combining downhole flow meter and temperature logs
Autorzy:
Busse, J.
Scheuermann, A.
Bringemeier, D.
Hossack, A.
Li, L.
Powiązania:
https://bibliotekanauki.pl/articles/1395710.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Śląski. Wydział Nauk o Ziemi
Tematy:
coal seam detection
permeability
geophysical logging
exploration
methodology
przepuszczalność
pokłady węgla
metodyka
poszukiwania
Opis:
The planning and design of any coal mine development requires among others a thorough investigation of the geological, geotechnical and hydrogeological subsurface conditions. As part of a coal mine exploration program we conducted heat pulse vertical flow meter testing. The flow data were combined with absolute and differential temperature logging data to gain information about the hydraulic characteristics of two different coal seams and their over- and interburden. For the strata that were localised based on geophysical logging data including density, gamma ray and resistivity hydraulic properties were quantified. We demonstrate that the temperature log response complements the flow meter log response. A coupling of both methods is therefore recommended to get an insight into the hydraulic conditions in a coal seam and its overburden.
Źródło:
Contemporary Trends in Geoscience; 2016, 5, 1; 1-17
2299-8179
Pojawia się w:
Contemporary Trends in Geoscience
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Próba odmetanowania pokładu węgla przed rozpoczęciem eksploatacji
Trial of coal seam pre-mining methane drainage
Autorzy:
Lubosik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/164770.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
zagrożenie metanowe
odmetanowanie
odmetanowanie wyprzedzające
próby dołowe
methane hazard
methane drainage
pre-mining methane drainage
underground trials
Opis:
Zagrożenie metanowe stanowi poważny problem w trakcie prowadzenia eksploatacji w polskich kopalniach węgla kamiennego, gdzie około 80% węgla wydobywane jest z pokładów metanowych. Jednym ze sposobów zmniejszenia zagrożenia metanowego jest prowadzenie odmetanowania górotworu, które polega na ujęciu metanu do instalacji i odprowadzeniu go na powierzchnię lub poza rejon eksploatacji. W artykule opisana została próba zastosowania odmetanowania wyprzedzającego, która przeprowadzona została w parceli ściany 121 w pokładzie 364 w KWK Brzeszcze (obecnie Nowe Brzeszcze Grupa TAURON Sp. z o.o.). W tym celu wywiercono 6 otworów odmetanowujących (TM1-6) o średnicy 76 mm i długości 100 m, prostopadle do ociosu chodnika taśmowego ściany 121, w pokładzie węgla. Odległość pomiędzy otworami wynosiła ok. 10 m, za wyjątkiem otworu TM1, który wywiercony został 75 m przed pozostałymi otworami. W momencie rozpoczęcia odmetanowania odległość czoła ściany 121 od otworów odmetanowujących wynosiła ponad 210 m, czyli otwory te znajdowały się w górotworze nienaruszonym, poza wpływem frontu eksploatacyjnego. W trakcie trwania próby monitorowano: stężenie metanu, wielkość ujęcia metanu, ciśnienie w otworach odmetanowujących, podciśnienie w rurociągu odmetanowującym oraz odległość od czoła ściany. Stwierdzono, że odmetanowanie wyprzedzające charakteryzowało się ok. 19-krotnie mniejszym ujęciem metanu od odmetanowania bieżącego, co prawdopodobnie związane jest z niską przepuszczalnością węgla.
Methane hazard constitutes a serious problem during exploitation in Polish hard coal mines, where approx. 80% of coal is extracted from methane hazard seams. Methane drainage ie. capture of methane from rockmass to drainage installation and transportation of removed gas to the surface or outside working panel is one of the most used system of methane hazard reduction. Underground trail of pre-mining methane drainage carried out in longwall 121 panel, seam 364, Brzeszcze Colliery (nowadays Nowe Brzeszcze Grupa TAURON Sp. z o.o.) is described in the paper. For that purpose 6 drainage boreholes (TM1-6) 76mm in diameter and 100m in length were drilled in a seam from chodnik tasmowy sc. 121, perpendicularly to the gateroad rib. Boreholes were drilled in 10m intervals except borehole TM1 which was drilled at a distance of about 75m before borehole TM2. When measurements started the distance between longwall 121 and drainage boreholes was about 210m thus the boreholes were placed in zone not affected by extraction pressure. During pre-methane drainage tests the CH4 concentration, its out-flow, pressure in a boreholes, negative pressure and distance from the longwall were measured. The results of this underground trial indicate that pre-mining methane drainage technology in this form is 19 times less efficient than classic methane drainage (during longwall advance), what probably results from low coal permeability.
Źródło:
Przegląd Górniczy; 2017, 73, 2; 44-50
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
4D gas geological research on coal seam with gas hazard potential in mining panel
Autorzy:
Cui, Hongqing
He, Xin
Wang, Zehua
Powiązania:
https://bibliotekanauki.pl/articles/2201387.pdf
Data publikacji:
2022
Wydawca:
Główny Instytut Górnictwa
Tematy:
gas geology
gas hazard prevention
small geological structure
fine geological survey
4D analysis
geologia gazowa
zapobieganie zagrożeniom gazowym
mała struktura geologiczna
szczegółowe badania geologiczne
analiza 4D
Opis:
According to regulations of the mining industry in China, it is necessary to carry out gas hazard prevention projects in advance when mining coal seams with gas hazard potential, and gas geological research should be taken as the basic work for optimal design and effective construction of gas hazard prevention projects. Research on coal seam with gas hazard potential have shown that anomalous geological area could be the gas hazard potential area as well, where superimposed tectonic and mining stress field usually results in tectonically disturbed coal and pressured gas. A 4D gas geological research method is used to find out the anomalous geological area and assess its gas hazard potential. The method covers two ranges of gas geological research: fine geological survey and 4D analysis. The former includes a comprehensive prospect of concealed small geological anomalies (such as small fault, small fold and coal thickness variation) by use of gas extraction projects; The latter includes a dynamic forecast of gas hazard potential from space-time perspective based on numerical simulation analysis on additional stress fields around small geological structures beyond coal mining face. Its research benefit the optimal design and effective implementation of gas hazard prevention measures in coal mining panel with high coal and gas outburst potential.
Źródło:
Journal of Sustainable Mining; 2022, 21, 2; 112--119
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of stress state in coal seam based on inverse problem solution using acoustic sounding data
Autorzy:
Kudaibergenov, Mels K.
Iskakov, Kazizat T.
Kudaibergenova, Bakytzhan S.
Powiązania:
https://bibliotekanauki.pl/articles/88885.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
coal seam
stress
elasticity theory
biharmonic equation
inverse problem
Opis:
The paper presents an algorithm for calculating the horizontal, vertical and tangential stresses in a horizontal coal seam lying between galleries. These stresses are expressed in terms of the Airy function, which satisfies a homogeneous biharmonic equation. For its numerical solution it is necessary to set boundary conditions. Practical limitations do not allow us to determine the tangential stresses on horizontal boundaries of the coal seam. Calculations of stresses are proposed to be carried out in two steps. The first step is to solve the inverse problem for the biharmonic equation to find unknown tangential stresses on horizontal boundaries of the coal seam. The inverse problem is solved by minimizing the residual functional. Its strong convexity is proved, which implies the existence and uniqueness of the solution of the inverse problem. The second step is to solve the boundary value problem for the biharmonic equation to calculate stresses in the coal seam. The result of a numerical experiment is presented.
Źródło:
Mining Science; 2019, 26; 173-187
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phosphorus minerals in tonstein; coal seam 405 at Sośnica-Makoszowy coal mine, Upper Silesia, southern Poland
Autorzy:
Kokowska-Pawłowska, M.
Nowak, J.
Powiązania:
https://bibliotekanauki.pl/articles/139189.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tonstein
Załęże beds
goyazite
gorceixite
apatite
phosphorus
barium
strontium
warstwy załęskie
goyazyt
apatyt
fosfor
bar
stront
Opis:
The paper presents results of research on tonstein, which constitutes an interburden in coal seam 405 at the Sośnica - Makoszowy coal mine, Makoszowy field (mining level 600 m), Upper Silesia, southern Poland. The mineral and chemical compositions of the tonstein differ from the typical compositions described earlier for tonsteins from Upper Silesia Coal Basin area. Additionally, minerals present in the tonsteins include kaolinite, quartz, kaolinitised biotite and feldspars. The presence of the phosphatic minerals apatite and goyazite has been recognized. The presence of gorceixite and crandallite is also possible. The contents of CaO (5.66 wt%) and P2O5 (6.2 wt%) are remarkably high. Analysis of selected trace elements demonstrated high contents of Sr (4937 ppm) and Ba (4300 ppm), related to the phosphatic minerals. On the basis of mineral composition the tonstein has been identified as a crystalline tonstein, transitional to a multiplied one.
Źródło:
Acta Geologica Polonica; 2013, 63, 2; 271-281
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of load characteristic of shield bolter miner cutting head under complex coal seam condition
Autorzy:
Qiao, S.
Xia, Y. M.
Liu, Z. Z.
Liu, J. S.
Ning, B.
Wang, A. L.
Powiązania:
https://bibliotekanauki.pl/articles/89071.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
complex coal seam
shield bolter miner
load characteristic
specific energy
load fluctuation
Opis:
Aiming at the complex conditions of the first shielded bolter miner in the actual work, the mechanical model of bolter miner cutting head was established. Based on cutting mechanism of the conical pick and the cutting head, the cutting head load and torque analysis model under complex coal seam were established. The dynamic characteristics of load and torque in the process of cutting head are analyzed under three different working conditions of cutting roof-coal layers, coal-floor layers and coal seam by finite element method. The results show that when the damage variable D=1, the coal-rock completely lacks the bearing capacity, and it forms arc-shaped crushing groove on the coal-rock. The large difference of torque between roof-coal layers and the roof-coal layers in the conical pick is 112 Nm, which indicates that the cutting head has the best performance with cutting the coal seam first and then cutting the rock. In the process of excavation, the load fluctuation coefficient of cutting the coal-floor layers and roof-coal layers is about 1.2 times of that of the coal seam. The results can provide a reference for the efficient cutting and performance evaluation of the bolter miner.
Źródło:
Mining Science; 2017, 24; 85-97
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proper borehole pattern design for coal seam methane drainage in Tabas coal mine using Comsol Multiphysics
Autorzy:
Bagherzadeh, Ali
Najafi, Mehd
Marji, Mohammad Fatehi
Noroozi, Mehdi
Powiązania:
https://bibliotekanauki.pl/articles/2201375.pdf
Data publikacji:
2022
Wydawca:
Główny Instytut Górnictwa
Tematy:
numerical modeling
borehole patterns
COMSOL Multiphysics
CFD simulation
coal gas drainage
modelowanie numeryczne
schematy otworów wiertniczych
symulacja CFD
odmetanowanie
Opis:
Optimizing the operational parameters of the borehole pattern in the coal seam includes the maximum amount of gas to be drained with the least amount of drilling, investment, and drainage time. The main purpose of this research is to properly design the drainage borehole pattern in the C1 coal seam of the Tabas coal mine. In this research, the Comsol Multiphysics software was used for numerical modeling of the boreholes. According to the method of diffusion of methane gas in a coal seam, the reduction of methane gas concentration and the amount of gas released from the coal blocks were approximated. For the gas drainage boreholes, the three patterns of the rectangular, parallelogram, and triangular forms were considered. Also, the boreholes were modeled with the three diameters of 76, 86, and 96 mm. This modeling was performed for 180 days of drainage operation and showed that the triangular pattern was more suitable than the other two patterns. The presented model is applicable in coal mines where gas drainage operations are necessary and helps engineers design the patterns of drainage boreholes to maximize their gas drainage efficiency.
Źródło:
Journal of Sustainable Mining; 2022, 21, 1; 54--64
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 96

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