New Analysis Method Of Seismic Earth Pressure On A Retaining Wall

Abstract:Retaining wall is one of the most widely used special structure in the practical engineering, is widely used in civil construction, highway engineering, bridge engineering, water conservancy, port engineering, railway engineering. The destruction of the retaining wall is widespread in the earthquake and in a variety of forms, the damage of retaining wall not only endanger people’s lives, more seriously, would block the traffic, bring difficult for the earthquake relief. The seismic design of the retaining wall has been one of the topics of domestic and foreign scholars research. Mononobe-Okabe formula is a common method used for calculate seismic earth pressure in the design of retaining walls, many assumptions of the Mononobe-Okabe formula that limited its application scope, and also it can’t obtain the position of application point of resultant force of seismic earth pressure and the distribution of seismic earth pressure.This article uses the calculation method of rotating retaining wall, it translate the seismic active earth pressure and seismic passive earth pressure problem into non-seismic earth pressure problem, by using horizontal layer analysis theory, it obtains application position of resultant force and distribution of seismic active and passive earth pressure and the analytical formulas of resultant force of seismic earth pressure, and the explicit solution of critical rupture angle by graphic method. The Calculation model considers the influencing factors such as vertical and horizontal seismic accelerations, cohesion and external friction angle between filler and back of retaining wall, equispaced overloading, batter angle of wall back, and so on. The formulas can be used for seismic active and passive earth pressure calculations of non-cohesive soil or cohesive soil with common border condition. The analysis results show the formula is the same as M-O formula under simplified assumptions. According to the appropriate assumptions, further simplify the seismic earth pressure calculation formula got by using rotating retaining wall method, it obtains the simplified calculation of the seismic earth pressure, the analysis results show the applicability of the simplified calculation formula, the rotating retaining method simplifies the deducing process of seismic earth pressure formulations, Unified the solution of the seismic earth pressure of retaining.