应力路径对盐城粉质黏土动剪切模量影响试验研究  

Experimental study on the influence of stress path on the dynamic shear modulus of silty clay in Yancheng

作　　者：王喆恺 谭慧明[1,2] 陶小三 WANG Zhe-kai;TAN Hui-ming;TAO Xiao-san(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing,Jiangsu 210024,China;Key Laboratory of Coastal Disaster and Protection of Ministry of Education,Hohai University,Nanjing,Jiangsu 210024,China;Jiangsu Earthquake Disaster Risk Mitigation Center,Nanjing,Jiangsu 210014,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210024 [2]河海大学海岸灾害及防护教育部重点实验室,江苏南京210024 [3]江苏省震灾风险防治中心,江苏南京210014

出　　处：《中国港湾建设》2024年第8期44-49,73,共7页China Harbour Engineering

基　　金：国家自然科学基金(52078187);江苏省研究生科研与实践创新计划项目(SJCX23_0190)。

摘　　要：沿海地区地下土常受到地震、施工、波浪等各种动力作用的影响。为了研究应力路径对粉质黏土动力特性的影响,选取盐城地区不同深度的粉质黏土原状样进行循环应力路径下的共振柱试验。结果表明:应力历史对土动力参数响应的影响显著,加卸载路径间土的最大动剪切模量Gmax和动剪切模量G之间有明显差异;在围压0~80 kPa时,Gmax快速上升,变异性减小;地质年代和埋深对土动力学参数的变化起重要作用。随着埋深增加,各应力路径下Gmax和围压变化时G的差异不断扩大,当地质年代发生变化时,G显著增加;根据试验提出最大动剪切模量与围压间的拟合关系式并提供不同应力历史粉质黏土的拟合结果,为盐城以及相关沿海地区的工程设计和施工提供参考。Underground soil in coastal areas is often affected by various dynamic effects such as earthquakes,construction,and waves.In order to study the influence of stress path on the dynamic characteristics of silty clay,resonance column tests were conducted on undisturbed samples of silty clay at different depths in the Yancheng area under cyclic stress paths.The results show that stress history has a significant impact on the response of soil dynamic parameters,and there is a significant difference between the maximum dynamic shear modulus Gmax and dynamic shear modulus G of the soil between loading and unloading paths;When the confining pressure is between 0~80 kPa,Gmax rapidly increases and variability decreases;The geological age and burial depth play an important role in the variation of soil dynamic parameters.As the burial depth increases,the difference between Gmax under different stress paths and G when the confining pressure changes continuously expands.When the geological age changes,G shows a significant increase;Propose a fitting relationship between the maximum dynamic shear modulus and confining pressure based on experiments,and provide fitting results for silty clay with different stress histories,providing reference for engineering design and construction in Yancheng and related coastal areas.

关 键 词：粉质黏土 共振柱试验 动剪切模量 应力路径 应力历史 土动力参数 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程] TU411[交通运输工程—船舶与海洋工程] TU435[建筑科学—岩土工程]