Study On Searching For The Most Dangerous Sliding Surface Of Three-Dimensional Slope

How to search the potential dangerous sliding surface is one of the most important and difficult points in slope stability analysis. At present, there are many methods to search for the most dangerous sliding surface of slope by using two-dimensional calculation method, but the study of research on the potential sliding surface of 3D slope is still not deep enough. The analysis of slope stability in practical engineering is usually a three-dimensional problem. The stability factor calculated by using two-dimensional-slope-calculation-method is conservative, so it will cause some unnecessary waste in the design of the slope or treatment of slope. Based on the deficiency of the research at the present stage, this paper attempts to use three-dimensional analysis method to calculate the stability coefficient of slope, and combined with the optimization algorithm to search the potential dangerous sliding surface of 3D slope.It is a very complicated problem to search the potential sliding surface of 3D slope. When the stability factor is used as the main index to evaluate the stability of slope, the problem of searching the potential dangerous slip surface of a three-dimensional slope can be transformed into a mathematical problem:The slope stability factor is a function of the basic parameters, physical properties and the shape of the sliding surface. The minimal value problem can be solved by the optimization method, this is the research ideas of this paper. Specific work and main conclusions are as follows:(1)In order to better compare the results of the search, this paper introduces two methods to calculate the stability factor of three-dimensional slope.The corresponding calculation program is worked out, and a typical example is used to verify the rationality of the program. At the same time, the influence factors of three-dimensional slope stability are analyzed. The influence degree of these factors on the stability coefficient is of guiding significance for the search of potential dangerous sliding surface;(2) Combined with three dimensional stability analysis method, the genetic algorithm is used to search the potential sliding surface. This paper simplified sliding body physical equation, and derive the simple constraint conditions of sliding surface to meet the constraint inequalities, this makes the search out of the most dangerous sliding mask has the actual physical meaning. The search results show that the genetic algorithm is applied to the potential dangerous sliding surface of 3D slope, which shows good global searching ability and convergence.(3)Drawing on the principle of genetic algorithm and the basic process, and according to the characteristics of the three-dimensional slope of the potential risk of sliding surface, a new method for searching the most dangerous sliding surface of 3D slope is presented,which called genetic intrusion algorithm. Two examples show that genetic intrusion algorithm is reasonable and effective, and the error between the search results and the genetic algorithm is very small, but the search efficiency is higher than the genetic algorithm.(4)The advantages and disadvantages of genetic intrusion algorithm and the genetic algorithm are analyzed in this paper. Learn from each other, these two methods are combined to potentially dangerous sliding surface search of three-dimensional slope. Compared with the results of the search results, it is known that the combination method can set the genetic algorithm and the advantages of the new method. Under the same conditions, the search efficiency is higher, and the precision of the search results is the best.