Study On Recognition And Judgment Of Potential Slip Surface Of Binary Structure Slope

As its own characteristics, dual structure of soil and rock has been the typical representative of slope structure. The Slope failure modes diverse:It may occur in the upper part of the soil, or in soil and rock contact interface, it may also be triggered on the weak structural plane of the lower part of the bedrock. Different internal and external conditions, slope potential slip surface of the shape, Position and the corresponding safety coefficient vary. The shape of the slip surface may be circular arc、plane shape or a compound type of the circular arc and plane. The accurate judgment of the failure mode is the precondition of slope stability analysis and reinforcement design. How to grasp and define the change law of the potential slip surface of the two element structure slope from the theoretical point of view, is the key to the analysis and prevention of the slope geological hazard, and the industry must also consider the reality of the problem.In this paper, the finite difference software FLAC3D is used to establish the numerical model of the ideal two element structure. In order to make the calculation simple, we assume that the interface of the soil rock interface is plane and the effect of ground water and earthquake is not considered. Under this assumption, the influence of soil rock interface angle, cohesion and internal friction angle on the two element structure slope potential sliding surface and safety factor discussion is discussed. The law of the stability of the two element structure developing with the angle of the interface, cohesion and internal friction angle is summarized. The FLAC3D numerical simulation results are checked by using Beijing Lizheng software. We find that Checking results and numerical simulation results have little difference, the law is basically the same.The above theoretical analysis results are applied to the verification of the slope engineering of Zhaotong Yongshan Hongyang area. Through practical analysis and calculation, the position, shape and the corresponding safety factor of the slope slip surface are obtained. The calculated results are in agreement with the observed data and the characteristic of the degeneration and destruction of the slope. The calculated results are in agreement with the observed data and the characteristic of the degeneration and destruction of the slope. This shows that the theoretical analysis model is reliable and effective.The conclusion of this paper can be used in practical engineering, and it can provide some help for the research and analysis of the design and construction of high slope support.