The Application And Stability Analysis Of Soil Nailing In Chengdu Area

Now, soil nailing plays a more and more role in the deep excavation support. But, the methods of stability analysis are different from each other. The stability analysis of soil nailing is a key content in the designing calculation of soil nailing. Because of complexity of the soil structure, it is impossible to definitely find out a slip surface that totally meets the real situation. So the first thing is to ascertain a slip surface that meets the real one approximately and is easy to be located during the designing calculation. And then, the soil nailing's designing parameters can be got with the slip surface. According to the normal geological conditions of foundation pits in Chengdu area, this paper chooses one kind of slip surfaces, which are used as potential ones in stability analysis presently, suitable for the soil structural characteristics in this area. Based on this, the force and moment balance analysis is carried on in the inner force calculation of soil nailings in order to avoid the uncertainty of the earth press. A predigested slice method based on the limit equilibrium method is also presented in this paper, which is suitable for Chengdu area. Following are the main research areas and achievements of this paper: 1.the normal engineering geologic conditions of foundation pits in Chengdu area; 2.promoting a logarithm screw line as the potential slip surface kind; 3.carrying on the force and moment balance analysis of soil nailing; 4.stability analysis of soil nailings by 3-D finite element method; 5.comparing the results of different calculating methods.