海相软土损伤力学特性动三轴试验研究

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DOI：10.19981/j.CN23-1581/G3.2026.11.015

中图分类号：TU43 文献标志码：A 文章编号：2095-2945（2026）11-0068-04

Abstract： Marine soft soil is widely distributed along the southeastern coast of China， characterized by high compressibility， low strength， and significant structural features. In major engineering projects such as metro tunnels， subsea utility corridors， and cross-sea bridge foundations， it often faces stability challenges under dynamic loading. To elucidate the damage evolution mechanism under cyclic loading， a series of dynamic triaxial tests were conducted under different water contents， confining pressures， and dynamic stress ratios. By defining a damage variable based on elastoplastic inflection strain εy and complete failure strain εf ， the evolution of damage-related parameters was systematically analyzed. The results indicate that： increasing water content does not significantly alter the average failure cycle number， but it accelerates the damage accumulation rate and markedly delays the yield point while elevating the failure strain; the dynamic stress ratio is the most sensitive factor in damage evolution， as its increase significantly reduces the soil's deformation resistance and accelerates damage progression; the effect of confining pressure exhibits a "dual role"： damage is more pronounced under medium confining pressure， whereas higher confining pressure can suppress the development of damage. These findings reveal the damage evolution mechanism of marine soft soil under dynamic loading and provide a theoretical basis for the dynamic stability assessment and disaster prevention of major coastal infrastructure.

Keywords： marine soft soil; dynamic triaxial test; damage characteristics; elastoplastic inflection strain; complete failure strain

海相软土广泛分布于我国东南沿海地区，具有高压缩性、低强度和显著的结构性等特点。（剩余4731字）