Analysis of landslide mechanisms of the southern red bed slope in the No.2 opencast coal mine in eastern Shengli coal field
FAN Zhiyong1，ZHOU Yang1，LIU Xiaoyu1，LI Shihai1，ZHANG Xin2
(1. Key Laboratory for Mechanics in Fluid Solid Coupling Systems，Institute of Mechanics，Chinese Academy of Sciences，Beijing 100190，China；2. Inner Mongolia Datang International Xilinhaote Mining Co.，Ltd.，Xilinhaote，Inner Mongolia 026000，China)
Abstract：Sliding mechanisms have been studied for the series of the landslides of the southern red bed slope in the No.2 opencast coal mine in eastern Shengli coal field. The geological exploration is used to determine the distribution of the faults and the properties of the strata. By field survey and comparison of the four images photographed by an unmanned aerial vehicle，the deformation and failure characteristics of every landslide area are analyzed phenomenally. Using the monitoring data of the GPS，the deformation characteristics of the two large landslides are analyzed quantitatively. Combined with boreholes information，the slip face of the deforming area is obtained. Based on the generalization of the stratum structure and the effect of water，a physical model experiment is made to qualitatively explore the failure evolution mechanisms of the southern red bed landslide. The research shows that，the watertight property of the F68 fault，the different deformation between the sandstone layers and mudstone layers，and the distribution of lots of weak layers with low shear strength in the southern slope are the primary geological factors resulting in the series of the landslides，the increase of the rainfall intensity aggravates the deformation of the southern slope. In fact，Sandstone and mudstone belong to hard rock and soft rock respectively，and the mudstone softens easily when encountering water；because of the different deformation of sandstone and mudstone，the steep joints in the sandstone become open and then the surface water infiltrates easier；besides，the groundwater cannot dissipate in the F68 fault. All of the above reasons cause the ulceration at the toe of the slope and the formation of the fracture zones on the surface of the slope. Under the condition of the rainstorm，plenty of rainwater infiltrates and softens the weak layers，the higher seepage water pressureexists in the weak layers and the hydrostatic pressure forms in the fracture zones，consequently leading to the multistage “horizontal-pushing-type”landslides.
樊智勇1，周 杨1，刘晓宇1，李世海1，张 信2. 胜利煤田东二号露天煤矿南帮红层滑坡机制分析[J]. 岩石力学与工程学报, 2016, 35(S2): 4063-4072.
FAN Zhiyong1，ZHOU Yang1，LIU Xiaoyu1，LI Shihai1，ZHANG Xin2. Analysis of landslide mechanisms of the southern red bed slope in the No.2 opencast coal mine in eastern Shengli coal field. , 2016, 35(S2): 4063-4072.
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2016, Vol. 35 
