Displacement-based Design Method Of Typical Support Structure In High Intensity Area

Along with the development of urbanization in China’s region,a lot of artificial slope are formed in the process of infrastructure construction,some of which are located in high-intensity areas.The earthquake action can easily exacerbate the instability of the slope,resulting in deformation and failure of the slope.The geological structure in western region active,complex and instability.,meanwhile earthquake-supported structures are prone to displacement deformation and damage.So,it is significant to take the anti-seismic measures into consideration during the design of slope engineering.In the traditional seismic design method for supporting structures,the seismic load is considered as a constant inertial force.However,a large number of experimental studies have shown that the seismic load changes continuously with time and space.Therefore,using the pseudo-static method(M-O method)to carry out anti-seismic design of the slope support structure in high-intensity area has certain deficiencies.Based on above mentioned points,the article uses seismic fluctuation records as input loads,on this basis the permanent displacement of the slope support structure is studied.Based on the permanent displacement threshold,the upper limit value of seismic yield acceleration that the slope support structure can withstand is determined.Combined with the limit analysis,limit equilibrium and multi-slider velocity field theory,the paper have researched the retaining wall and anti-slide pile.On the research of retaining wall,without the preparation of the shape of rupture surface,a multivariate functional formula of a gravity retaining wall with respect to a fracture angle(the angle between the straight line and the horizontal plane at each segment of the slope rupture surface)in the rotation failure mode or translational mode;On the research of anti-slide pile,assumed the shape of rupture surface was logarithmically spiral,the paper established a formula between the placement of anti-slide pile and the depth of the potential rupture surface.Then the formula is coded,the mathematical planning method was used to search for and determine the base width of the gravity retaining wall and the slope rupture surface.or the corresponding reasonable position of anti-slide pile.Analyzing the influence of the variation of the slope soil properties and then analyzing the influence of the variation the property of retaining wall(such as the friction angle between wall with the soil)on basement width of wall and so on.And comparing it with the method of calculation in the specification,the results of different methods have a similar regularity.Using the finite difference method,the numerical simulation software(Flac3d)was used to simulate the seismic wave motion process of the slope support engineering carried out by the displacement control design method,and preliminary verification of the method proposed in this paper was reasonable.