循环荷载下游泥质黏土的动力特性试验研究

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中图分类号：TU411.8 文献标志码：A 文章编号：1673-3851（2025）09-0697-12

Reference Format： XUShiyu，LIU KaifuExperimental investigation onthe dynamiccharacteristics of muckyclayunder cyclic loading[J]. Journal of Zhejiang Sci-Tech University，2025，53（5） ：697-708.

Experimental investigation on the dynamic characteristics of mucky clay under cyclic loading

XU Shiyu ，LIU Kaifu School of Civil Engineering and Architecture， Zhejiang Sci-Tech University， Hangzhou 3lO0l8， China

Abstract： Considering the possble failure phenomena of soft clay under dynamic actions such as cyclic loading，a series of dynamic triaxial tests were conducted on muddy clay under various confining pressures， dynamic stress amplitudes，loading frequencies，and other factors. The evolution characteristics of excess pore water pressure，cumulative plastic strain，and stress-strain hysteresis curves of muddy clay under cyclic loading were systematically analyzed. The results indicated that with an increasing number of cycles，both the axial cumulative plastic strain and the excess pore water pressure of the muddy clay samples graduall increased. An increase in the cyclic loading stress amplitude accelerated the growth of the cumulative plastic strain，whereas increases in confining pressure and loading frequency exhibited a certain inhibitory effect on the cumulative plastic strain. The movement amplitude of the stress-strain hysteresis curve of muddy clay gradually decreased with the increasing number of cycles. A higher confining pressure increased the inclination of the hysteresis curve，while an increase in the cyclic loading amplitude made the shape of the stressstrain hysteresis curve more slender. Additionally，an increase in loading frequency reduced the spacing between the stress-strain hysteresis curves. This study enhances the understanding of the dynamic characteristics of muddy clay under cyclic loading conditions and provides valuable reference for investigating the strength changes and deformation mechanisms of soft soil under long-term cyclic loading.

Key words： dynamic triaxial test； muddy clay; cyclic loading； axial cumulative plastic strain； stress-strain hysteresis curve

0 引言

随着中国经济的快速发展，交通基础设施及海洋工程亦呈现出快速发展的态势。（剩余12966字）