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Evaluation of Seismic Earth Pressure Considering Lateral Deformation

ZHANG Jian-min1,SONG Fei2(1.State Key Lab of Hydrosciences and Engineering/School of Civil Engineering,Tsinghua University,Beijing 100084,China; 2.School of Highway Engineering,Chang'an University,Xi'an,Shaaxi 710064,China)  
Evaluation of seismic earth pressure is one of the key items in the earthquake-resistant design of retaining structures.Previous studies indicate that seismic earth pressure is closely related to the lateral deformation of the backfill.Classic Mononobe-Okabe earth pressure theories can be used to compute the earth pressure at the active and passive limit states only,ignoring the effect of lateral deformation on earth pressure change.In this paper,the variation of earth pressure coefficient with the strain increment ratio is investigated.The earth pressure coefficient is experimentally confirmed to have no unique relationship with the wall displacement,but it has a unique one with the strain increment ratio.The compression-dilatancy coupling effect is found to be responsible for the dependency of the earth pressure change on the strain increment ratio and also the lateral strain constraint of the backfill.From this finding and new concept of intermediate soil wedge,a new method is then developed for the evaluation of the seismic earth pressure under any lateral deformation.Furthermore,Its essential effectiveness is preliminarily checked through comparing the calculated results with model test data.
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