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Experimental Studies on Cyclic Shear Behavior of steel-clay interface Under Constant Normal Load

China Ocean Engineering 2023年第3期37卷 519-524页

作者： YU Shi-wen WANG Jie LIU Jun-wei WANG Teng School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China China Communications Third Harbor Engineering Co. Ltd.ShanghaiChina School of Civil Engineering Qingdao University of TechnologyQingdao 266520China

The degradation of the shear stress between pile-clay interface caused by undrained cyclic jacking affects the jacking force.A series of large displacement monotonic shear,cyclic shear and post-cyclic monotonic steel plate-clay interface shear te sts were performed under the constant normal load(CNL)condition to inve stigate the effects of normal stre ss,cyclic amplitude,and number of cycles on a steel plate-clay interface using the GDS multi-function interface shear tester.Based on the experimental results,in monotonic shear tests,change of shear stress took place in the specimen,the shear stress rapidly reached the peak value at shear displacement of 1 mm,and then abruptly decreased to the residual value.In cyclic shear te sts,accumulated displacement was a better parameter to describe the soil degradation characteristics,and the degradation degree of shear stress became greater with the increasing of normal stress and accumulated displacement.Shear stress in post-cyclic monotonic shear tests did not generate a peak value and was lower than that in monotonic shear tests under the same normal stress.The soil was completely disturbed and reached the residual strength when the cumulative displacement approached 6 m.An empirical equation to evaluate shear stress degradation mechanism was formulated and the procedure of parameter identification was presented.

关键词： cyclic shear steel-clay interface constant normal load cumulative displacement residual strength

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