Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method
A quantitative method of structural system reliability was proposed to study the influence of random rock mechanical parameters and loads on the stability of the coal seam floor above confined aquifers. To obtain the reliability probability of the floor, two modes of water-resistant floor failure we...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2018/9580271 |
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| author | Haifeng Lu Xiuyu Liang Nan Shan You-Kuan Zhang |
| author_facet | Haifeng Lu Xiuyu Liang Nan Shan You-Kuan Zhang |
| author_sort | Haifeng Lu |
| collection | DOAJ |
| description | A quantitative method of structural system reliability was proposed to study the influence of random rock mechanical parameters and loads on the stability of the coal seam floor above confined aquifers. To obtain the reliability probability of the floor, two modes of water-resistant floor failure were suggested as follows: (1) mining completely removed the water-resistant key strata of the floor. In this case, the failure modes were of three main types: mining failure, confined water intrusion, and combined mining failure and intrusion. (2) Failure modes included shear and tensile failures when the thickness of the key strata was greater than 0. On the basis of the elastic thin plate theory, the performance function that calculates the reliability probability of all modes could be obtained. The failure modes were regarded as the series system. The Monte Carlo method was employed to calculate the reliability probability of each failure mode and series system. The results showed that the random rock mechanical parameters and loads of the key strata significantly influence the antiwater inrush capacity of the floor. In addition, the water inrush coefficient and reliability probability can be simultaneously used as the evaluation indexes of water inrush risk. Both these indexes could improve the assessment of the reliability of the floor. |
| format | Article |
| id | doaj-art-736980aee3094d04857aa468f69682b0 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-736980aee3094d04857aa468f69682b02025-02-03T01:12:56ZengWileyGeofluids1468-81151468-81232018-01-01201810.1155/2018/95802719580271Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability MethodHaifeng Lu0Xiuyu Liang1Nan Shan2You-Kuan Zhang3College of Earth and Environment, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaState Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Guangdong 518055, ChinaNanjing Institute of Environmental Sciences, Ministry of Environmental Protection of the People’s Republic of China, Nanjing, Jiangsu 210042, ChinaState Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Guangdong 518055, ChinaA quantitative method of structural system reliability was proposed to study the influence of random rock mechanical parameters and loads on the stability of the coal seam floor above confined aquifers. To obtain the reliability probability of the floor, two modes of water-resistant floor failure were suggested as follows: (1) mining completely removed the water-resistant key strata of the floor. In this case, the failure modes were of three main types: mining failure, confined water intrusion, and combined mining failure and intrusion. (2) Failure modes included shear and tensile failures when the thickness of the key strata was greater than 0. On the basis of the elastic thin plate theory, the performance function that calculates the reliability probability of all modes could be obtained. The failure modes were regarded as the series system. The Monte Carlo method was employed to calculate the reliability probability of each failure mode and series system. The results showed that the random rock mechanical parameters and loads of the key strata significantly influence the antiwater inrush capacity of the floor. In addition, the water inrush coefficient and reliability probability can be simultaneously used as the evaluation indexes of water inrush risk. Both these indexes could improve the assessment of the reliability of the floor.http://dx.doi.org/10.1155/2018/9580271 |
| spellingShingle | Haifeng Lu Xiuyu Liang Nan Shan You-Kuan Zhang Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method Geofluids |
| title | Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method |
| title_full | Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method |
| title_fullStr | Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method |
| title_full_unstemmed | Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method |
| title_short | Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method |
| title_sort | study on the stability of the coal seam floor above a confined aquifer using the structural system reliability method |
| url | http://dx.doi.org/10.1155/2018/9580271 |
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