| The foundation pit of the slope site,that is,excavating the foundation pit on the slope,is a problem that has only appeared in recent years.In addition to the particularity and complexity of its engineering and site,there are few studies on this problem at home and abroad.Study on the Mechanic Performance for leveled foundation pit support pile is relatively mature at home and abroad,and the Mechanic Performance for leveled foundation pit support pile and the foundation pit support pile of the slope site have significant differences.In order to understand the Mechanic Performance for the foundation pit support pile of the slope site,we probe deeply into the problem in this paper.The main work is as follow:(1)As for the analysis of slope stability,the three methods including limit equilibrium method,finite element method and finite difference method are used to analyze the stability of homogeneous slope and heterogeneous slope respectively,so as to illustrate the reliability and effectiveness of finite element numerical analysis results.(2)Using the above three methods analyze the influence of different physical mechanical parameters of rock and soil on slope stability,such as soil specific weigh,cohesion c and internal friction angle,elastic modulus E,Poisson's ratio and dilation angle etc..In this way,the importance of the rock and soil parameters to the stability of the slope is explained,and the theoretical basis for the value of the parameters in the subsequent numerical simulation is provided.(3)Simulated using MIDAS/GTS NX finite element analysis software,and analyzed the original slope stability and the stability of slope under different pile long support.We also analyzed displacement field and stress field changes before and after supporting,in order to explain the supporting pile is anti slide pile and slope stability's relationship with pile length relationship.(4)The MIDAS/GTS NX finite element software is used to simulate the displacement nephogram of the supporting piles under different excavation steps.Through the analysis,the difference between the displacement of the upper and lower piles and the displacement characteristics of the upper pile and the lower pile is obtained.(5)The MIDAS/GTS NX finite element software is used to simulate the stress nephogram of the foundation pit anti slide pile support under different excavation steps,and the distribution of soil pressure strength before and after excavation is obtained.According to the soil stress distribution in stress nephogram are summarized on soil pressure distribution of pile,and the difference of soil pressure distribution of pile.(6)In numerical simulation analysis,by changing the slope angle to simulate the distribution of soil pressure of pile back under different angles,the theoretical formula of the relationship between the active earth pressure coefficient of the pile back and the slope angle is obtained through theoretical analysis and mathematical statistics.(7)Lizheng software is used to supporting design of foundation pit excavation of the slope site in the practical projects.At last,combined with the actual situation,we give some suggestions,which will provide a reference for similar projects. |
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