Stability Analysis Of Masangwan Landslide Influenced By Underground Mining

Landslide caused by mining under mountain with topography and geology condition of landslide is one of the main surface damage of underground mining in mountain area.With the interdisciplinary nature and complexity,landslide induced by underground mining is a complex mechanical process involving many factors.Study of landslide prevention induced by mining involves the slope stability of the main mining factors, ground movement and deformation, overburden movement and stress-strain relationship, the mechanism of mining landslide, slope stability prediction, the long-term slope stability and other issues.By MaSangWan landslide in sichuan JinGang coal mine as the research object, the topography, regional geology background, geological structure, mine production technology, MaSangWan landslide overview of JinGang coal mine were investigated; the impact factors of mining landslide and the slope stability influenced by inverse slope mining were analysised, the law of deformation and failure of overburden and slope by inverse slope mining based on similar simulation test were studyed;By numerical simulation of MaSangWan landslide,we obtained the displacement and the stress variation after mining; Finally, by stability calculation and evaluation of MaSangWan landslide, we obtained the influence mechanism MaSangWan landslide.There main search aehievements are as follows:(1) The analysis of slope stability influenced by inverse slope mining show that with the exploitation, slope stability factor continuously decreased, When the slope is beginning to reach full mining subsidence, landslide stability coefficient reach the minimum, after which no changes, at this point the slope is the most dangerous.(2) The results of similar simulation test shows that horizontal displacement of overburden in gently inclined seam was larger than in horizontal seam, rock sink and move to the seam dip angle influenced by Mining Subsidence,then produced shear stress and horizontal tensile stress, in slope top, the tensile stress is so large as to generating surface cracks, Slight damage in slope toe.(3) Numerical results showed that with coal mining, the slope of the stress distribution changed greatly.In the slope top had a tension stress zone and Local tensile stress yielded.In the slope Toe, stress and shear stress concentration was obvious, and local compression and shear yield. (4) From the calculation of the mining strength we can see, coal mining is a minor mining and underground mining on the stability of the slope was less affected.According to the MaSangWan ground deformation data shows that MaSangWan landslide area's level of influence was medium strong.(5) MaSangWan slope stability calculation results show that The slope stability factor reduced by the influence of mining.The slope was in basically stable after the interconnect coal mining,and under the influence of rainfall the stability coefficient declined further that leading to landslide.