Study Of Slope Stability Analysis Based On Vector Sum Analysis Method And Its Applications

The analysis of slope anti-sliding stability has always been an important subject in the research field of geotechnical engineering.There are a lot of slopes in water conservancy and hydropower engineering,road engineering,mining and other projects.Currently,blasting is mainly used in the construction of these projects as a rock excavation method.As we all know,blasting is a high-risk technical means,it will inevitably take a negative impact on the surrounding environment while using blasting to break rock mass.The vibration effect caused by blasting has a huge threat to the stability of the slope.Therefore,it is of great theoretical significance and engineering application value to analyze and study the slope stability under blasting load.In view of this problem,the following researches are mainly carried out in this article:(1)Based on the vector sum analysis method(VSAM),the problem of determining the critical slip surface of the slope was studied.To overco0 me the shortcomings of basic ant colony algorithm,the combining of the ant colony system(ACS)algorithm with the VSAM was proposed for searching the noncircular critical slip surface of a slope.The ant division mechanism and the pheromone flatness mechanism were introduced to improve the global optimization ability of the ACS.Through two typical slope examples of ACADS and a highway engineering slope,the feasibility and accuracy of the algorithm were verified.The results show that the proposed algorithm improves the search efficiency and prevents the algorithm from falling into premature.(2)Based on the existing blasting theory,the vibration characteristics of blasting and the propagation law of blasting vibration wave in rock mass were analyzed.According to the analysis results,the semi-empirical and semi-theoretical triangular pulse load was used to simplify the effect of blasting load,then,the dynamic finite element model of slope under blasting load was established.Based on the results of dynamic finite element method(DFEM),the VSAM was used to solve the safety factor time history of the slope under blasting load.Through the calculation of a homogeneous slope example,the feasibility of the combining of the VSAM with the DFEM to analyze the dynamic stability of the slope under blasting load was verified.(3)Taking the Kuangshancun slope in the reservoir area of Xiangjiaba Hydropower Station as the study object,the stability of this slope was analyzed according to the proposed research ideas.Firstly,the global slip surface and local slip surface as well as the corresponding vector sum safety factors were searched by the improved ACS algorithm proposed in the paper,respectively.Based on the static stability analysis,the method of combing the dynamic FEM and the VSAM was used to solve the safety factor time history of the Kuangshancun slope under the blasting load.According to the analysis results,the stability of the Kuangshancun slope was evaluated.