Stability Analysis And Parameter Optimization Of Soil Slopes Supported By Anti-slide Piles

Slope,a landform widely distributed in the surface,is widespread in a variety of engineering and economic activities.However,due to the slope engineering is a very complex comprehensive geotechnical problem,how to ensure the stability,economy and practicality of slope engineering is still a very important issue in the current process of modern urban construction.Because of its wide application range,the great anti-slide effect,and many outstanding advantages to the surrounding geological environment,it has become one of the most important methods to control the landslide and other geological disasters.The stability of the slope engineering is affected by the structural characteristics of the slope,the topography,the soil properties,the geological structure and the supporting parameters of anti-slide pile.However,the analysis of effect mechanism and the weight of each factor is not very perfect,also needs further research and exploration.Based on the mechanism of slope anti-slide pile support,using the Midas/GTS finite element numerical simulation software,the safety factor andthe horizontal displacement of anti-slide pile are the main evaluation indexes of slope stability.The single factor variable method is used to analyze the soil strength parameters,slope angle,groundwater level and pile position.The results show that the stability of the slope is significantly related to soil cohesion,internal friction angle,groundwater level and slope angle.But the elastic modulus and Poisson's ratio have little effect on the stability of the slope.When the anti-slide pile position in the middle of the slope,the slope has the strongest stability.Taking the concrete slope reinforcement project as an example,the effect of pile length,pile spacing and pile diameter on slope stability was analyzed by single factor variable method using Midas/GTS numerical simulation software.Then,using the orthogonal test design method,the three factors of pile length,pile spacing and pile diameter are selected under the same conditions as the physical and mechanical parameters of the anti-slide pile.The safety factor of the slope and the maximum horizontal displacement of pile top are used as the evaluation indexes.Using the range analysis,it is found that the influence of pile spacing on slope safety factor and horizontal displacement of pile top is the biggest,followed by pile diameter and pile length.According to the above analysis,the paper uses Matlab mathematic software to analyze the comprehensive influence of pile length,pile spacing and pile diameter on the slope,and obtain the relevant empirical formula.The slope stability and the three factors are linear regression,and the correlation issignificant.Finally,the spacing between the piles is taken as the single variable,and the influence of other factors is used to optimize the design of the anti-slide pile.The mathematical relationship between the safety factor and the pile spacing is obtained by Matlab software.The related empirical formula provide a reference for the future to solve similar slope engineering stability issues.