Computational Study On Non-limit Earth Pressure Of Retaining Wall With Mode Of Translation Mode

With the further advancement of Chinese infrastructure construction,as a common supporting structures,retaining wall plays an increasingly important role in hydraulic,highway engineering,railway engineering,civil engineering,mining engineering,geotechnical engineering,providing assurance for the smooth completion of the project and the normal operation of the building.The main source of force for the retaining wall is the earth pressure behind the wall.How to calculate the earth pressure more accurately is the key content of the retaining wall design.At present,calculating earth pressure in engineering commonly used to applying Coulomb's theory and Rankine's theory,the methods are only applicable when the soil reaches the limit displacement.However,a large number of tests proved that the wall displacement affects the distribution of earth pressure.Based on this,the research on the theory of non-limit earth pressure is carried out.For the retaining wall of the wall back tilt with the translation mode,the relationship between the displacement and the internal,external friction angle are established.Based on the mohr circle for stress considering the soil arching effect,we obtain the expressions of horizontal stress,vertical stress and shear stress.They are applied to the horizontal layer analysis method,and the theoretical expressions of the non-limit active and passive earth pressure intensity,resultant force and resultant force point height is derived.Compared with the existing theory,the non-limit active and passive earth pressure distribution solutions in this paper agree well with the experimental values,which fully explains the rationality and correctness of theoretical derivation of this paper.In addition,some corresponding parameters sensitivity analysis were done,the results are as follows:In the non-limit active state,regardless of the inter-soil shear stress is considered or not,the magnitude of the earth pressure decreases with the increase of the wall displacement,the curve which the peak is closed to the bottom of the wall is convex.The earth pressure considering the shear stress in the upper part of the wall is less than the not considering shear stress,and the lower part is opposite.The shear stress first increases greatly and then decreases a little with the increase of internal friction angle,and increase with the increase of displacement,external friction angle and ground overload.With the increase of wall back inclination,the shear stress decreases first,then increasing in reverse,the earth pressure will increase.In the non-limit passive state,regardless of whether or not the inter-soil shear stress isconsidered,the earth pressure increases with the increase of the wall displacement,being concave curve distribution,and the earth pressure considering shear stress is greater in the upper part of the wall.the lower part is less.With the increase of displacement,internal friction angle,external friction angle and ground overload,the shear stress increases with the increase of the back angle of the wall,which increases in the upper part of the wall and decreases in the smaller range at the bottom of the wall.Regardless of whether the soil is in the non-limit active state or the non-limit passive state,the shear stress between the soil layers can't be neglected,the soil effects as the opposite of the wall displacement.,and the distribution of shear stress is also consistent with the earth pressure.Whether the shear stress effect is considered,the earth pressure resultant force is the same,and the position of the earth pressure resultant force considering the shear stress is between the Coulomb's solution and the theoretical solution of the shear stress.