Numerical simulation on fault water-inrush based on fluid-solid coupling theory
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Abstract
About 75% water-inrush accidents in China are caused by geological structure such as faults, therefore, it is necessary to investigate the water-inrush mechanism of faults to provide references for the mining activity above confined water. In this paper, based on the fluid-solid coupling theory, we built the stress-seepage coupling model for rock, then we combined with an example of water-inrush caused by fault, studied the water-inrush mechanism by using the numerical software COMSOL Mutiphysics, analyzed the change rule of shear stress, vertical stress, plastic area and water pressure for stope with a fault, and estimated the water-inrush risk at the different distances between working faces and the fault. The numerical simulation results indicate that: (1) the water-inrush risk will grow as the decrease of the distance between working face and the fault; (2) the failure mode of the rock in floor with fault is shear failure; (3) the rock between water-containing fault and working face failure is the reason for water-inrush.
Keywords
fault fluid-solid coupling water inrush numerical simulationPreview
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References
- Bai H B, Miao X X, 2009. Research progress and major problems of water preserved coal mining. Journal of Mining & Safety Engineering, 26(3): 253–262.Google Scholar
- Bu W K, Mao X B, 2009. Research on effect of fault dip on fault activation and water inrush of coal floor. Chinese Journal of Rock Mechanics and Engineering, 28(2): 386–394.Google Scholar
- Hu G, 2008. Study on the water transmitting mechanism while fault belt activated in fully mechanized top-coal caving. Doctor’s Thesis, China University of Mining & Technology.Google Scholar
- Jaeger J C, Cook N G W, 1979. Fundamentals of rock mechanics. London: Chapman and Hall.CrossRefGoogle Scholar
- Li L C, Tang C A, Liang Z Z, Ma T H, Zhang Y B, 2009. Numerical analysis of pathway formation of groundwater inrush from faults in coal seam floor. Chinese Journal of Rock Mechanics and Engineering, 28(2): 290–297.Google Scholar
- Li L J, Qian M G, Li S G, 1996. Mechanism of water-inrush through fault. Journal of China Coal Society, 21(2): 119–123.Google Scholar
- Li Q F, Wang W J, ZHU C Q, 2009. Analysis of fault water-inrush mechanism based on the principle of water-resistant key strata. Journal of Mining & Safety Engineering, 26(3): 253–262.Google Scholar
- Liu W T, Wu Q, 2008. Numerical simulations of water inrush of fault f_0 in Fangezhuang coal mine. Chinese Journal of Rock Mechanics and Engineering, 27: 3604–3610.Google Scholar
- Liu Z J, Hu Y Q, 2007. Solid-liquid coupling study on water inrush through faults in coal mining above confined aquifer. Journal of China Coal Society, 32(10): 1046–1050.Google Scholar
- Qian M G, Shi W P, 2003. Ground pressure and strata control. Xuzhou: China University of Mining & Technology Press.Google Scholar
- Yang S A, 1994. Prevention and control of water inrush from faults in floor rocks in the workings. Journal of China Coal Society, 19(6): 620–625.Google Scholar
- Yang T H, Tang C A, Tan Z H, Zhu W C, Feng Q Y, 2007. State of the art of inrush models in rock mass failure and developing trend for prediction and forecast of groundwater inrush. Chinese Journal of Rock Mechanics and Engineering, 26(2): 268–277.Google Scholar
- Zhang K, 2010. Study on mechanical model and fluid-solid coupling mechanism for brittle rocks. Doctor’s Thesis, Chinese Academy of Sciences.Google Scholar