Stability Analysis Of Non-circular Sliding Surface Of The Slope

Slope stability analysis is one of the oldest problems in geotechnical engineering, andalso one of the most active problems in research and practice. Over the years, a largenumber of scholars had raised a lot of methods for slope stability analysis. There had beena lot of calculation methods for soil slope stability safety factor and the search methods forcritical sliding surface, and those methods had been applied in several large-scalesoftwares for analyses. However, there are still many problems. In this paper, the in-depthstudy will be conducted on the selection of control variables for non-circular slidingsurface (sliding surface mode). The search modeling method for the most dangerousnon-arc sliding surface on the soil slopes will be studied based on the genetic algorithm.The key points of the study include the model’s genetic variables, the design of fitnessfunction and realization from variables to fitness function based on algorithm. The mainresearch contents are as follows:First, the generalization and summary of classic slices method: Sweden method,Bishop method, Janbu method, MP method, etc., and their scopes and the advantages anddisadvantages are pointed out;Second, the genetic algorithm is used to search the most dangerous sliding surface ofthe simple slope, and examples are used to verify its feasibility and effectiveness;Third, based on the Janbu method, the most dangerous sliding surface of the slopecan be used to search the arc-shaped sliding surface is the most commonly used methodwith simple calculations by assuming the shapes. However, the actual sliding surface cannot be approximated by arc sliding surface. So only the calculation method of non-circularsliding surface can be used; selection of control variables for sliding surface of slopes ofany shapes (sliding surface simulation strategy) and the search of the most dangeroussliding surface. In this paper, a simulation strategy assuming the non-circular slidingsurface is put forward. It is different from the general strategy. It is assumed to that severalparagraphs (of the same horizontal distance) are connected with each other to form a foldline, thus reducing the control variables, but it is obviously a rough approximation. Thenew simulation strategy presented here adopts six segments (of different horizontaldistances) connected together, which is more realistic than the same horizontal distance.Through example, the validity of these methods is verified to provide a theoretical basisfor the slope analysis and design method for slope engineering.The search of the most dangerous sliding surface of soil slope and its correspondingminimum safety factor are important contents of geotechnical engineering. The analysisresults have a great impact on the project. If the results are too conservative, it willincrease the costs and add unnecessary workload; if the calculations are wrong, the resultsmay be unsafe and it may cause losses of life and property. Therefore, its study is of greatsignificance.