Experimental study on cyclic deformation properties of saturated Fujian sand at different loading frequencies
作者机构：Key Laboratory of Urban Security and Disaster Engineering of the Ministry of EducationBeijing University of TechnologyBeijing 100124China
出 版 物：《Underground Space》 (地下空间（英文）)
年 卷 期：2023年第13卷第6期
页 面：150-165页
核心收录：
学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the National Outstanding Youth Science Fund Project of the National Natural Science Foundation of China(Grant No.51722801) National Natural Science Foundation of China(Grant No.52078020)
主 题：Sand liquefaction Cyclic loading frequency Hysteresis loop shape Shear modulus Damping ratio
摘 要：In this study,a series of undrained cyclic torsional shear tests were conducted to investigate the effect of cyclic loading frequency f on the pre-liquefaction(shearing contractive(SC)period and initial shearing dilative(ISD)period)and post-liquefaction(late shearing dilative(LSD)period)deformation properties of saturated Fujian *** secant shear modulus G and damping ratioλin the entire cyclic loading process,and the unloading tangent shear modulus G_(L1)and flow deformation tangent shear modulus GL2 in the ISD and LSD periods were adopted to quantitatively characterize the evolution of hysteresis loop with an increase in shear strain amplitude *** test results show that the effect of f on G of saturated Fujian sand in the SC period is not ***,all the G-γ_(a),G_(L1)-γ_(a),and GL2-ca curves in the ISD and LSD periods showed a downward trend with an increase in *** study also proposes a modified method for calculatingλto compensate for the analytical error caused by the non-closure of hysteresis *** with the classical curves that mainly applied in geotechnical engineering,theλfirst increases and then decreases with the increase ofγ***,theλevaluated by the modified method is approximately 10%–15%more than theλevaluated by the traditional method when theλreaches its peak value.
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