摘要
软弱结构面往往控制着岩体的蠕变变形,含水率又是影响软弱结构面蠕变特性的重要因素,通过开展不同含水率条件下砂岩软弱结构面剪切蠕变试验,得到了不同含水率条件下剪切蠕变曲线,并考虑加载历史对试验曲线进行了修正。在此基础上,通过模型辨识选取Burgers模型描述砂岩软弱结构面蠕变的黏弹性特性。分析了含水率对砂岩软弱结构面剪切蠕变特性的影响,并对含水率影响软弱结构面剪切蠕变特性的机制进行了探讨。
Creep behavior of weak structural plane plays an important role in the creep deformation of rock mass. Water content of the fillings is a significant factor influencing the creep properties of the weak structural plane. A series of shear creep tests on the weak structural plane of sandstone with different water contents are conducted. The curves of the shear creep deformation vs. time under different water contents of the fillings are derived. The effects of water content on the shear creep behavior of weak structural plane of sandstone are analyzed. Based on the test results, the creep model of the weak structural plane is identified; and Burgers model is derived to describe the creep behavior of the weak structural plane. Moreover, the influences of water contents on the parameters of the creep model are further studied; and the creep mechanism of the weak structural plane of sandstone under different water contents of the fillings is presented.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第7期1865-1871,共7页
Rock and Soil Mechanics
基金
国家自然科学基金(No50479072,40672192)
国家自然科学基金重点项目(No50539090)
湖北省自然科学基金(No2007ABB040)
