Research On Slope Support Based On Displacement Back Analysis

Because of the continuous progress of urbanization,land use ratio is also increasing,slope engineering began to occur frequently.The influence of slope engineering damage is often bad,so the slope support design scheme should meet the requirements of specifications in terms of deformation and stability,and the premise of slope support design is to determine the accurate rock and soil layer parameters of the slope.The measurement of these parameters takes time and effort.This paper takes a slope engineering example in Changsha as the research object,carries on the slope displacement back analysis research and the slope support design plan simulation checking calculation.The main contents and conclusions of this paper are as follows:(1)The back analysis theory of displacement is briefly introduced,and the application of strength reduction method in slope stability research is briefly described.(2)According to the relevant data of slope engineering,the numerical model of slope is established by FLAC3 D software.The cohesive force c and internal friction angle ? of the soil layer parameter of strongly weathered sandstone are taken as the parameters of the back analysis of displacement,and the other deformation parameters remain constant.The research scheme under different parameter combination is determined,and the slope deformation under different test scheme is simulated by software FLAC3 D.(3)Based on the slope displacement values simulated by FLAC3 D software under different test schemes,the mapping relationship between rock and soil layer parameters and slope displacement values is studied by using MATLAB software.After the study and training are completed,the measured slope displacement values are substituted into the neural network.The parameters of rock and soil layer are obtained by simulation.(4)The parameters of rock and soil are simulated by software FLAC3 D,and the simulated displacement value is compared with the measured displacement value,and it is found that the displacement value is basically the same.The result shows that it is feasible to determine the parameters of slope soil layer by displacement inverse analysis method.(5)According to the parameters of rock and soil layer obtained from the back analysis of displacement,the design scheme of slope support is simulated and calculated.The empirical calculation shows that the slope support scheme meets the requirements of the code in three aspects: horizontal displacement,vertical displacement and stability,which indicates that the support scheme is applicable to the project.(6)On the one hand,the uncertainty of field test and indoor test can be eliminated by determining the parameters of rock and soil by the method of displacement back analysis;on the other hand,the cost of field test and indoor test can be saved,which is of great engineering practical significance.The simulation and calculation of support scheme by software FLAC3 D can also play a certain reference role in similar projects.