Alteration Zone Weakening And Slop Stability Analysis Under Seepage

Stability analysis of tailings reservoir slope is one of the most important problems in geotechnical engineering.Based on the detailed study of the stability of the tailings slope, it is found that many factors can affect the stability of the tailings slope.Considering the coupling effect of seepage field stress field and the weakening effect of seepage on the alteration zone is an important reason for its stability.In this paper,Sanshandao tailings pit slope engineering as an example, the typical seepage effect as the main clue.Based on the relevant experiments, the weakening of the .alteration zone and the stability of the slope under seepage condition are analyzed.The main research contents and results are as follows:(1)The physical and mechanical properties of the alteration zone rocks in the slope are systematically analyzed. The physical and mechanical properties such as the density, porosity and triaxial compressive strength of the alteration zone are obtained.(2)Under the condition of seepage,this paper introduces the basic theoretical knowledge of the coupling of seepage field and stress field,and deduces the equation of the finite element equation.(3)Based on ABAQUS programming language, the initial pore pressure of the model is set.The position of the infiltration line in the slope can be obtained by comparing the position of the infiltration line in the engineering exploration. The results are in the same position, which indicates that the physical parameters of the rock are numerically simulated. The setting of the boundary conditions is in line with the actual engineering and the reliability of ABAQUS for seepage analysis of the slope.(4)Under the condition of seepage flow, ABAQUS was used to simulate the stress field and seepage field of 487 section and 503 section of slope. The relationship between pore water pressure, effective stress and displacement change was studied.Comparing the stress value, the displacement value, the plastic zone and the safety factor without considering the seepage conditions, it is found that there is a big difference in whether or not the seepage is considered.(5)Aiming at the geological condition of the rock slope in the warehouse, the special monitoring system is established and implemented,including surface displacement monitoring, surface crack monitoring, deep displacement monitoring, water level monitoring and macro inspection monitoring.The contents and methods of monitoring,monitoring instrument and working principle are introduced in detail.According to the displacement monitoring results, the results of ABAQUS are more close to the actual results under the consideration of seepage, which shows that the analysis of dam is more reasonable.