A Study On The Reinforcement Effect Of Anti-slide Piles Of Xiahongyan Talus Slope Of Baihetan Hydropower Station

Landslide is a kind of geological hazard of slope failure,which is the most widely distributed and severely threatened in various geological hazards.Therefore,the treatment of landslide is of great significance to the safety of the lives and property of the people and the construction of the project.As one of the main engineering measures for landslide control,Anti-slide pile is widely used because of its many advantages.However,due to the lack of monitoring data after the control project,there are few studies on the evaluation of the reinforcement effect of anti-slide pile.This paper based on the Xiahongyan talus slope of Baihetan Hydropower Station,a series of studies about the reinforcement effect of anti-slide piles of Xiahongyan talus slope were performed.The main research results are as follows.(1)On the basis of understanding the investigation data of Xiahongyan talus slope in detail,and references to the results of previous studies,the basic characteristics of the talus slope were confirmed.Especially the sliding scale,position and spatial distribution of the slip surface,properties of slip soil,and so on.Then the deformation and failure modes and external factors were analyzed.Results shows: the deformation mechanism of xiahongyan talus slope is because of the empty condition of Dazhaigou in front of it,the talus slope creep or slide along the weak zone under the influence of heavy rainfall and human activities.(2)In order to confirm the stress state and deformation characteristics of the accumulation body,MIDAS/GTS numerical simulation procedure was used to construct a three-dimensional simulation model for the stability of the slope before the control project.The numerical simulation results show that: there is a wide range of continuous shear failure zone in the vicinity of the sliding zone.And it is easy for the accumulation body to form a traction deformation along the interface between bedrock and overburden.Compare the results of numerical simulation with that of engineering geology analysis,it can be seen that they look the same,which means that the establishment and parameter selection of the numerical calculation model for Xiahongyan talus slope are reasonable.(3)The monitoring results of the surface and internal displacement of the slope before and after the control project were compared and analyzed.And the deformation mechanism and external influence factors of the slope were obtained.The stress and strain monitoring data of anti-slide piles was analyzed.Results show that: after the completion of the anti-slide piles construction,the internal force of each pile is stable,which shows that the design and distribution of anti-slide piles are reasonable.(4)MIDAS/GTS numerical simulation procedure was used to construct a three-dimensional simulation model for the stability of the slope after the control project.Results show that: after the control project,the stability of the talus slope was greatly improved,and the slope is stable in whole.(5)Based on the numerical simulation of the stability under different working conditions,combined with the slope monitoring results,it can be concluded that the control effect is remarkable,and after the completion of the anti-slide pile project,the talus slope tends to be stable.