Stability Analysis Of Bank Landslide In Tuanshiban Reservoir In Wanzhou District Based On Numerical Simulation

With the rapid development of China's economy,we can see that the continuous upgrading and development of water conservancy,railway,tunnel,highway,bridge and other projects have brought huge economic benefits and convenient transportation to people's production and life.At the same time,we should also pay attention to the impact of engineering activities and some natural factors on the bank slope of the reservoir,strengthen the slope management and protection measures,so that people's travel and life and property safety are effectively guaranteed.Taking the bank slope of Tuanshiban as the engineering background,this paper analyzes quantitatively the stability of the slope in the study area according to its geological environment characteristics and existing geological exploration data,mainly combining numerical simulation method,limit equilibrium method and bank collapse prediction method.At the same time,FLAC3 D software is used to simulate the slope support model of anti-slide pile,anchor frame beam and the combination of anti-slide pile and anchor frame beam under the most adverse conditions.On the premise of ensuring the safety and stability of slope,the supporting scheme is compared and analyzed in detail from the aspects of supporting effect and stability coefficient,and reasonable supporting suggestions are put forward at last.The main research contents are as follows:(1)Combined with the field investigation and data analysis,it can be seen that the bank slope of Tuanshiban belongs to the wading sliding slope of old collapse and slip accumulation body.The stability of the bank slope of the reservoir mainly includes the potential instability factors,such as bedrock properties,rainstorm and mountain flood water,and the change of reservoir water level.(2)Using the transfer coefficient method in the limit equilibrium method,the stability of the slope is calculated under four working conditions of natural state,heavy rain,high water level(175m)and sudden drop of water level along the potential sliding face,and the main factors affecting the landslide of the bank slope of the slates reservoir are analyzed according to the calculation results.(3)The graphic method in the bank collapse prediction method is used to analyze the intensity of bank reconstruction of the slope and further quantitatively evaluate the stability of the bank slope according to the bank collapse prediction width formed by the bank reconstruction prediction line.(4)the software of FLAC3 D numerical simulation respectively group SLATE of the slope in a natural state,heavy rain,high water level(175 m),the water level in the four conditions of three dimensional numerical model of slope,and according to the horizontal and vertical displacement contours,maximum shear strain increment cloud,plastic zone distribution nephogram and stability coefficient of slab of the slope stability analysis.(5)FLAC3D numerical software was used to simulate the support models of antislide pile,anchor frame beam and the combination of anti-slide pile and anchor frame beam under the most unfavorable conditions.According to the horizontal and vertical displacement cloud map,maximum shear strain increment cloud map,plastic zone distribution cloud map and stability coefficient,the supporting scheme is compared and analyzed from the support effect,stability coefficient and other aspects,and then the reasonable support suggestions are put forward.