Stability Analysis Of Guizhou Old City Landslide And Simulation Of Anti-slide Pile Reinforcement

This paper takes Guizhou Laocheng landslide as the research object.Guizhou Laocheng landslide is located in Zigui old county of Guizhou Town.Before the storage of the Three Gorges Reservoir,there have been local deformation signs,but it has not been treated.In recent years,the state has invested more and more in the control of geological disasters in the Three Gorges reservoir area,so it is meaningful to study the stability and control measures of laocheng landslide.On the left bank landslide is located in the Yangtze river,is the top under the narrow width of winnowing form,the sliding surface is circular,the slidi ng body thickness generally 13-24 m,average thickness of about 21 m.The slide area is 11.17×104 m2,and the slide volume is 215.6×104 m3.The transfer coefficient method is used to calculate the stability of the landslide.According to the collected regional geological data and field investigation,the zhoulaocheng landslide is classified as a more complex class II project.Therefore,in addition to the limit balance method,the strength reduction method in FLAC3D is also used to verify the stability.The modeling process is Auto CAD--Profes sional 3D modeling software(Rhino)--numerical simulation software calculati on(FLAC3D).This mode eliminates the need for complex interface programming language,especially for complex surface models such as surface and stratum,which are transformed from the original complicated surface built by skin method to directly imported and generated by Loft command with one click.It simplifies the modeling process,improves the accuracy of the model,and makes the calculation results more realistic.The study shows that laocheng landslide is basically stable under the current working conditions,but the repeated fluctuation of reservoir water level may induce landslide instability under extreme working conditions.Finally,the influence of anchorage depth and pile spacing on the stability of anti-slide piles is studied.The anchoring depth of anti-slide pile is studied by using false three-dimensional model,and it is concluded that 1/5 pile length is the most reasonable anchorage depth.Based on the real three-dimensional model,the pile spacing of anti-slide piles is studied,and it is concluded that the pile spacing of 5m is the most reasonable,which meets the requirements of safety and economy.And this guide landslide anti-slide pile control design scheme.