Active Earth Pressure Comparative Study Of Rigid Retaining Wall In Different Displacement Mode

In this paper, research is based on the road of Three Gorges Reservoir area industrial park of Donggang industrial park in Chongqing. Because there are many deep cuttings and high embankments in the engineering section, setting up the retaining wall in the appropriate sections was considered. It is crucial for retaining wall design that expliciting the distribution of each point the earth pressure against the back of the retaining wall and accurately calculating the resultant force of earth pressure and the application point of the resultant force. For earth pressure Calculation, Classical earth Pressure theories such as Coulomb and Rankine earth Pressure theory have been widely used to design the retaining structures, because they are simple and can reflect the mechanical concepts clearly. But the classical theories are only valid for the backfill of translation wall arrives the limiting condition, and assumed the earth pressure distribution to be hydrostatic. But the retaining structures in service usually accept some restrains and may subject to move different from translation. The measured earth pressures on retaining wall are mostly non-linear. So, it’s necessary to study on the earth pressure distribution, the resultant of earth pressure and the application point of the resultant force considering the mode of wall movement. In this connection, many scholars have studied it. However, most of them were qualitative analysis on the issues of related earth pressure, quantitative analysis were relatively less, in addition, the filling surface was horizontal and the back of wall was vertical in the model. It is necessary to consider effects of slope angle of filling-β and dip angle-α of earth retaining wall on the earth pressure distribution, the resultant of earth pressure and the application point of the resultant force in dieffrent modes of wall movement.First, this paper is based on the horizontal layer method which is proposed by M. E. KaraH. The wedge soil is divided into infinitesimal soillayer that parallel to the backfill surface, then seting equilibrium equation of it, deducing the calculation formula of active earth pressure in different modes of wall movement including three kinds of modes Translation, Rotation about base, Rotation about top. And then the effects of the angle β and α on the active limit displacement, the earth pressure distribution, the application point of the resultant force were analyzed by using PLAXIS finite element software to create49finite element calculation model,considering three modes of wall movement. The results show that in T movement mode, active application point of the resultant force relative slope angle of filling-β and angle-a are positively correlation and close to the linear correlation, the application point of the resultant force relative height alterate abou批t0.325～0.483. In RB, RT movement modes, the application point of the resultant force can be adjusted by the application point of the resultant force in T movement mode. The research results was applied to analysis retaining wall of the road of Three Gorges Reservoir area industrial park of Donggang Industrial Park in Chongqing. The results show that it can calculate earth pressure relatively real.