Stability Analysis Method Of Slope And Retaining Structure Based On Heuristic Algorithm

The stability analysis of slope and retaining structure is not only the key step of slope treatment and reinforcement structure design,but also the important basis of landslide assessment and forecast,therefore it has great practical significance to promote national infrastructure construction and guarantee people's life and property safety.With the development of modern mathematics and computer,the stability analysis model of slope and retaining structure is improved by the new achievements of mathematics and computer,which provides a new idea for the study of the stability of complex slopes and retaining structures.Based on the current research hotspot of intelligent computing,this paper introduces a new heuristic algorithm——Gravitational Search Algorithm.In response to its limitations,other algorithms and optimization strategies are combined to improve it and three new heuristic algorithms are obtained:Particle Gravitation Search Algorithm(PGSA),Hybrid Heuristic Algorithm(HHA)and Chaos Gravitation Search Algorithm(CGSA).Then this paper explores the applications of the three new algorithms in the search of arbitrary sliding surface of slopes,the calculation of working soil nailing force and the solution of active earth pressure in finite backfill respectively.Firstly,the three-time uniform B-spline function is used to simulate the sliding surface of slope with arbitrary shape,and the effective B-spline curve endpoint processing method and the sliding surface generation strategy are discussed,thus a new method of arbitrary sliding surface construction is proposed.Furthermore,based on the slope stability analysis method of Morgenstern-Price and the Hybrid Heuristic Algorithm(HHA)proposed in this paper,a novel method for slope stability calculation and critical sliding surface search is proposed.The reliability and effectiveness of the method are verified by the standard test questions of four slope stability analysis.Secondly,aiming at the problem of the difference between the measured soil nailing force and the calculating soil nailing force,by analyzing the use of the phase-nailed-soil interaction mechanism,based on the soil arching effect and the Morgenstern-Price limit equilibrium oblique-strip method,the analysis model of soil nailing stability and the calculation model of soil nailing were established respectively,and the coupling effect between internal force and potential slip surface of soil nailing was simulated by using the two iterations,and the working soil nailing force and potential slip surface were obtained.The Particle Gravitation Search Algorithm(PGSA)is introduced in this paper to optimize the solution.The results of the test of Clouterre project in France demonstrate the rationality of this method.Finally,considering that the finite soil is not suitable for the classical earth pressure theory,it is assumed that the failure form of the finite fill is a single slide block or a double slider mode based on the logarithmic helical sliding surface.Considering the general situation of inclined roughness of wall anticline and the inclination of fill surface,using pseudo static method to calculate seismic force,according to limit analysis limit theorem,and based on the Chaos Gravitation Search Algorithm(CGSA)proposed in this paper,the calculation method of the upper limit of the active earth pressure of the finite backfill is put forward.