Stability Analysis Of High Steep Rock Slope And Optimum Design Of Anchorage

All along,the proportion of landslides and collapses in natural geological disasters has remained high.According to relevant data,China's average number of deaths per year due to slope instability has reached hundreds,resulting in economic losses of up to 20 billion yuan,which has caused great harm to people's lives and property.Because of its high slope,large slope,and complicated geological conditions,high and steep rock slopes are more prone to slope failure.This article relies on the protection project of the Banbi Mountain in Chengde City.Through on-site investigation and data analysis,the stability and support design of the typical section of high rock slope are analyzed and studied.The main research results are as follows:Combining the site investigation report and existing data,it comprehensively analyzes the structural features and development characteristics of the rock mass of the slope,including the structural fracture characteristics and influencing factors of the development of the dangerous rock mass,the spatial distribution characteristics of the weak structural plane and Its condition analysis.The traditional limit equilibrium method is adopted to calculate the stability safety factor of typical profiles of rock slopes under different working conditions.The results show that the stability of the slope is reduced by the existence of structural planes in the slope rock mass,but the stability factor of slope stability is 1.23 when only the structural plane is considered without other precipitating factors.With the addition of such unfavorable factors as heavy rain and earthquake,the stability of the slope will be greatly reduced,making the slope unstable or even unstable.The numerical simulation of the stability of the selected typical section of the slope in storm conditions is compared with that of the traditional limit equilibrium method.The results are close.And through the analysis of the displacement map and incremental shear cloud stress map,it can more intuitively reflect the damage of the rock body along the weak structural plane,which can provide reference for the design of the back support program.The unified strength theory was introduced into the stability analysis of rock slopes,and the effects of intermediate principal stress coefficients and double shear stress state parameters on slope stability were studied.The study found that the calculation results under the Mohr-Coulomb strength theory are relatively conservative,which will cause certain waste of engineering materials.The design of anchorage support for the slope was carried out,and the optimization of the cable inclination angle,anchorage force,distance between anchor cables and anchor cable length was optimized.After the optimization,the stability of the slope reinforced with anchor cable is better and has certain economical efficiency,which improves the rationality of anchorage support.