Occurrence Regularity And Reinforcement Evaluation Of Multi-slip Surfaces Of Qinghua Temple Landslide In Yanan

For the slope with the characteristics,which are steep in the upper part of the slope,slow in the lower part of the slope and slender irregularities on slip zone,there may be secondary sliding surface before sliding along as a whole.Aimed at the secondary or local sliding situation,how to accurately distinguish and identify the secondary sliding surface of irregular slope has been a difficult task of the engineering.The terrain in Qinghua Temple landslide area is high in the west and low in the east,high in the north and low in the south,and high in the middle and low in the both sides.It is inclined from west to east and the topography is large.The landslide of Qinghua Temple is a complex slope.Therefore,it is of great engineering significance to study the secondary sliding surface and its reinforcement optimization in Qinghua Temple landslide.In this paper,based on the study of the occurrence regularity and the reinforcement problem of the secondary sliding surface in Qinghua Temple landslide,conclusions are drawn as follows,based on the comparison of previous studies,it is suggested that there may be several secondary surface failure,and pointed out that the if the neglect of these secondary sliding surface,it will lead to local instability and make the reinforcement does not achieve the purpose of reinforcement.Secondly,in order to discuss the law of occurrence of the secondary sliding surface in Qinghua Temple landslide,the method of local constraint on the slope is proposed,on the basis of the strength reduction finite element method,the law of occurrence of the secondary sliding surface of Qinghua Temple landslide typical slope is analyzed under the conditions of the strength parameter of the natural water content soil and strength parameters and residual strength of saturated soil.Thirdly,in order to determine the three-dimensional distribution of the secondary sliding surface of Qinghua Temple landslide,a number of three-dimensional secondary sliding surfaces are proposed based on the law of occurrence of the typical slope secondary sliding surface,three-dimensional secondary sliding surface position differences and characteristics are analyzed and compared under the conditions of the strength parameter of the natural water content soil and strength parameters and residual strength of saturated soil.Finally,according to the reinforcement design of Qinghua Temple landslide and the distribution trend of these three-dimensional secondary sliding surfaces,the corresponding reinforcement and optimization design are discussed,which provide more reliable reinforcement scheme for the reinforcement design of Qinghua Temple landslide.The method of analyzing the distribution law of the typical secondary sliding surface of complex slope by the method of strength reduction finite element method is proposed in this paper,discrimination problem of a series of secondary sliding surfaces of complex slope under complex terrain can effectively solve,and the reinforcement optimization design can realistically accomplish by the combination of these three-dimensional secondary surface distribution trend,it can provide more reliable reinforcement program for the complex slope.