摘要
波浪循环荷载作用下,饱和软黏土产生强度弱化效应,表现为土体的强度降低,变形模量减小,从而使地基的承载能力大幅度降低,降低了防波堤等重力式结构物和构筑物的安全稳定性,甚至造成工程事故.模拟防波堤地基土在波浪循环荷载作用下的实际应力路径,对天津港原状软黏土进行了室内动、静三轴试验,由试验数据确定了不同荷载组合下软黏土抗剪强度折减率的规律性曲线,进而确定了波浪循环荷载作用下软黏土的强度弱化程度,可作为工程设计参考.作为应用实例,结合软黏土强度折减规律及有限元方法,分析了波浪循环荷载作用下半圆体防波堤地基稳定性以及地基加固方案的有效性.
Strength softening may happen to the saturated soft clay under the action of wave cyclic loading.The strength of the soft clay may further decrease and the modulus of deformation becomes small.As a result,the soil foundations will experience significant loss of bearing capacity and the stabilization of the gravity structure and architecture such as breakwaters will be worsened,even result in engineering accident.Modeling the actual load path of the foundation soil under the action of cyclic wave loading,the static and dynamic triaxial test was conducted on the undisturbed soft clay samples taken from Tianjin Harbor.From the test data,the regular curves of the strength discounting ratio were determined for the soft clay under different dynamic and static load combinations and then the strength softening extent of the soft clay can be determined and referred to for project design.For practical application,the stability analysis of the semi-circular breakwater foundation under cyclic wave loading was performed with the regularity of the clay shear strength discounting ratio and the finite elements method and the efficiency of the foundation reinforcement method was also analyzed.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2010年第11期943-948,共6页
Journal of Tianjin University(Science and Technology)
基金
交通部西部交通建设科技基金资助项目(200632800003-06)
关键词
饱和软黏土
波浪循环荷载
动三轴试验
循环弱化
防波堤
地基
saturated soft clay
cyclic wave loading
dynamic triaxial test
cyclic softening
breakwater
foundation
