| This paper selects the Jincheng shangxia landslide as the research object.Based on the data collection and field investigation,the environmental geological conditions of the landslide area and the basic characteristics of the landslide are analyzed.The physical and mechanical parameters of the rock and soil are obtained by experiments such as rock and soil mechanics.The FLAC3 D numerical simulation software is used to quantitatively analyze the stress-strain distribution and displacement changes under different working conditions.Secondly,the limit equilibrium method is used to calculate the stability coefficient of the landslide under different working conditions,and the results are compared with FLAC3 D to analyze the genetic mechanism of the landslide.Finally,based on the geological structure and topography of the landslide body,reasonable suggestions for the treatment of landslides are proposed.Finally,based on the geological structure and topography of the landslide body,reasonable suggestions for the treatment of landslides are proposed.The following brief conclusions are drawn in the subject research.(1)Xiaqin landslide belongs to rock landslide,and the landslide body slides along the soft interlayer of carbonaceous mudstone.After the excavation of the slope,the original stress of the landslide body is redistributed,resulting in the landslide being in an unstable state.Slope sliding is controlled by internal factors such as topography,hydrogeology and lithology combination.Artificial slope cutting and precipitation are external factors for landslide occurrence;(2)The intrinsic factor is the root cause of landslide sliding.The sliding surface of the landslide area is artificially filled with fully water-permeable and fully weathered sandy shale.The permeability of the carbonaceous mudstone is relatively weak,which is an unfavorable combination of lithology.It is the key to the formation of the sliding surface of the landslide;(3)Manual excavation of slope feet and precipitation is an important external factor in the formation of landslides.Before the excavation,due to heavy rainfall and artificial irrigation on the top of the slope,the surface water penetrates into the slope body,and the upper loose rock and soil body collects into the aquifer,which causes the mudstone to soften and form a weak layer.Due to the traction of the leading edge of the landslide,a tensile crack is formed at the trailing edge of the landslide.The artificial slope cuts the original stress balance of the slope,the shear stress at the foot of the slope increases,and the sliding zone develops further;(4)Using the method of geological drilling,the visual rock formation information of the unexposed rock formation and the position of the weak interlayer(carbonaceous mudstone)are obtained,so that the sliding surface of the landslide is roughly inferred,and the material structure of the landslide body is further To understanding.Combining indoor rock mechanics test and geotechnical test,the physical and mechanical properties of each rock and soil are obtained;(5)Using flac3 d numerical simulation software to further quantitatively analyze the stability of the landslide,the landslide is divided into three sections,each section is divided into: original slope body,post-excavation and saturated water conditions for the landslide The body is analyzed for maximum and minimum principal stresses,shear stresses,and its increments and displacements.The analysis results are consistent with the actual survey;(6)Based on the stability analysis,combined with the current situation of landslide,several schemes for the treatment of landslide are proposed,such as anti-slide pile scheme,anchoring engineering scheme and prestressed anchor cable anti-slide pile scheme.And analyze the advantages and disadvantages of the program.Finally,the prestressed anchor cable anti-slide pile scheme was selected.And make reasonable suggestions for water interception and drainage in and out of the landslide. |
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