Dynamic Analysis Of Slope Protected By Composite Soil Nailing Wall Under Earthquake Action

The composite soil nail supporting technology is an integrated reinforced technology used with the other soil reinforced technology in soil nailing structure.It is one kind of special soil nail supporting technology,which happens with the development of slope and deep foundation engineering in the last few years.This technology overcomes the flaw of traditional soil nail supporting technology,namely can't control the deformation of slope,so it has very good prospects for development.The earthquake in our country is frequent,and the geological condition is quite complex.In many engineering construction process,including road and railroad,the projects must unavoidably pass through the high intensity earthquake belt.Therefore,it is necessary to carry on the dynamical analysis of the composite soil nail supporting slope under the earthquake action.The major works of this article are as follows:(1) The formation,the development and the research present situation of the composite soil nail supporting technology have been discussed.The research survey and the application prospect of the composite soil nail supporting technology under the earthquake action have been summarized.In addition, the dynamical study method has been summarized,and the question existing in the present research work for the composite soil nail supporting technology has been analyzed.(2) Considered the coordinated work between the composite soil nail supporting structure and the soil body,according to failure mode of soil slope, the seismic stability analysis model for composite soil nail supporting slope has been established by using the limiting equilibrium theory,in which the influence of the pre-stressed force of anchor on the stability analysis is considered.The dynamic search pattern of slipping surface of composite soil nail supporting slope with computer has been deduced,so with the changes of design parameters of composite soil nails,the dynamical analytical process for stability of composite soil nail supporting structure has been realized.So the stability analytical question for the composite soil nail supporting structure has been better solved.Finally,the dynamical stability analysis program for composite soil nail supporting slope has been written.(3) Based on the characteristics of composite soil nail supporting slope,on the basis of fully analyzing the work mechanism of each part of the composite soil nail supporting structure,simultaneously considered the bidirectional earthquake action,the three-dimensional finite element analysis model has been established with the finite element analysis software ADINA.Taken a slope supporting project as an example,the dynamical response of the composite soil nail supporting structure has been analyzed.Moreover,the change rules of the axial forces of the pre-stressed anchors and soil nails under earthquake wave action,and the response acceleration,the dynamical displacement of supporting structure have been simulated.