低频循环荷载下海积软土蠕变特性试验研究  

Experimental Study on Creep Behavior of Marine Soft Clay under Low Frequency Cyclic Loading

作　　者：刘娉慧[1] 贾景超[1] 杜雅峰 

机构地区：[1]华北水利水电大学,郑州450011 [2]平煤神马建工集团,河南平顶山467000

出　　处：《地下空间与工程学报》2015年第5期1193-1198,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(40602034)

摘　　要：低频循环荷载作用下软粘土力学行为具有其独特性,为了研究低频循环荷载作用下海积软土的蠕变特性,利用土体三轴蠕变试验仪,针对珠江三角洲地区的海积软土开展了一系列蠕变试验,并对该地区海积软土的典型循环蠕变曲线进行讨论,初步探索了软土在低频循环荷载与静荷载作用下蠕变特性的异同,研究发现,两种加载方式下土体累积变形量总体较为接近,而低频循环荷载作用相较于静荷载作用,软土更慢地进入衰减型蠕变阶段及达到变形稳定。同时,对比分析了围压、主应力比和加载频率对软土低频循环荷载下循环蠕变特性的影响。It is necessary to study the creep behavior of marine soft clay under low frequency cyclic loading during the investigation of effect of low frequency cyclic loading on mechanical properties of soft clay. Creep tests of marine soft clay in the Pearl River Delta Region under both low frequency cyclic loading and static loading was conducted on soil by triaxial creep test instrument. The typical cyclic creep curves were analyzed and discussed. Deformation properties of soft clay under low frequency cyclic loading and static loading was compared and discussed. It indicates that soft clay has comparative cumulative deformation during the two loading modes. However,attenuation creep stageand stable deformation stage would be achieved slower under the low frequency cyclic loading. Moreover,the influence of the confining pressure,ratio of principal stresses and the loading frequency on the cyclic creep properties of the soft clay were also discussed in the paper.

关 键 词：海积软土 循环蠕变 低频循环荷载 

分 类 号：TU411[建筑科学—岩土工程]