Seismic dynamic response theoretical analysis for L-shaped reinforced soil walls
The L-shaped retaining wall and reinforced soil are combined to make full advantage of its good seismic performance.It can be used in supporting engineerings in earthquake-prone and high earthquake intensity regions.The failure mechanism and dynamic response of L-shaped reinforced soil retaining wall under earthquake load are studied.In order to define two failure modes of long-heel baseplate and short-heel baseplate,the critical coefficient of heel plate length(λcr)is proposed on the basis of the second and the third slip surface generation conditions.Assume that the backfill sliding surface is a straight line,applying the upper bound theorem and using the Mohr-Coulomb failure criterion,the critical state equations of L-shaped reinforced soil retaining walls under two failure modes are established respectively,as well,the seismic yield acceleration coefficient is derived.The optimal solution is given according to the extremum principle,and the critical yield acceleration coefficient and its corresponding inclination angle of the backfill sliding surface are obtained.The failure modes and critical yield acceleration coefficients affected by geometric parameters,physical and mechanical parameters and tensile strength of bars are analyzed.Through the analysis of the example,it can be seen that the reinforcement structure can effectively improve the seismic capacity of L-shaped retaining wall and change its failure mode.When the tensile strength of the design reinforcement is large enough,L-shaped reinforced soil retaining wall only suffers from long-heel plate failure.
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