Study On Earth Pressure Of Earthquake Considering Shape Of Slip Surface And Soil Arch Effect

The retaining wall,as a supporting structure that can effectively prevent deformation of the rock and soil behind the wall,is widely used in construction engineering,road traffic,water conservancy and oth er engineering constructions.The earth pressure from the lateral soil is its design calculation.The m ain research object is also the oldest and most basic subject in the geotechnical field.With the frequent occurrence of earthquakes around the world in recent years,more and more researchers have paid attention to earthquake earth pressure.At present,t he research on earthquake earth pressure has yielded fruitful results,but in some special cases,the research on earthquake earth pressure is still in progress.There are deficiencies.This paper takes the inclined retaining wall around the bottom of the wall as the research object,considers the effect of displacement on the soil arch effect and earthquake earth pressure,and adopts a combined research method of horizontal layer analysis method and pseudo-static method to study different slip surfaces.Earthquake active and passive earth pressure distributions,combined forces,and heights of combined forces,and numerical analysis using finite element so ftware.The main contents and conclusions are as follows:(1)Taking the analysis of displacement to soil arch effect as the entry point,the lateral soil pressure coefficients considering displacement and soil arch effect are analyzed,and two different shapes of slip surface expressions and their influencing factors are discussed.Under certain conditions such as the inclination of the retaining wall and the friction angle of the soil,the side earth pressure coefficient increases with the increase of the displacement,decreases with the increase of the friction angle in the soil,and increases with the increase of the friction angle.The inclination angle of the straight slip surface decreases with the increase of the seismic acceleration coefficient,and the logarithmic spiral slip surface gradually becomes steeper with the increase of the displacement.(2)The theoretical calculation formulas of seismic active and passive earth pressure distributions,combined forces,and combined action points for two d ifferent slip surface shapes,straight and logarithmic spiral,are derived,and the results obtained from the two slip surfaces are compared.The results show that,for the active earth pressure of the earthquake,the impact of the sliding surface is relat ively small.The results obtained by the two types of sliding surface in this paper are very close;the passive earth pressure of the earthquake is different,although the results of the two types of sliding surface shape change basically consistent,but the earth pressure distribution and resultant force of the logarithmic spiral slip surface are significa ntly smaller than those of the linear slip surface,and the height of the combined force acting point is higher than the linear slip surface.(3)The effects of factors such as seismic acceleration coefficient,slip surface inclination angle,internal and external friction angle,and displacement amount on the distribution of active and passive earth pressure,resultant force,and the point of action of the force are analyzed through an example.The results show that the seismic active earth pressure gradually decreases with the increase of the displacement,but the seismic passive earth pressure is the opposite.The combined seismic active earth pressure increases with the increase of the seismic acceleration coefficient.When the temperature changes from-30° to 30°,the resultant force also increases,and the passive earth pressure change trend is opposite to the active earth pressure,and the effect of the earthquake on the resultant force is the most obvious.When it increases and decreases,the height of the combined point of seismic passive earth pressure will increase.And the validity of the theoretical derivation of this paper is verified by numerical simulation.