岩土力学2011，Vol.32Issue(8)：2261-2266,6.
冻土三轴蠕变特性试验研究及平面冻土墙厚度的确定
Experimental study of triaxial creep properties of frozen soil and thickness determination of flat frozen soil wall
摘要
Abstract
In order to determine the thickness of flat frozen soil wall with evident rheological properties, the triaxial creep properties of frozen soil are analyzed. Through theoretical analysis of rheological properties of frozen soil, the logarithmic creep equation of frozen clay is established under complex stress state. The triaxial creep tests for manual prepared frozen clay specimens are carried out by "cold box-triaxial pressure chamber" light test equipment system; so that the creep curves of frozen clay under complex stress state are obtained. According to the test results, the logarithmic creep equation parameters of frozen clay are obtained through regression analysis of logarithmical nonlinear creep equation. According to the rheological theory of frozen soil and the established creep equation, as well as the thickness formula of flat frozen soil wall, through adopting Visualc++ 6.0 and Matlab 6.0, the computer application software is exploited which can calculate thickness of frozen clay wall. With the software, the relationships between the thickness and the span, the pit exposure time, and the pit excavation depth are analyzed. The thickness of flat frozen soil wall possesses rapid growth trend with time extension in the short term and then gradually becomes stable. The thickness of flat frozen soil wall is affected lightly by the span; but it possesses gradual upward trend with the increasing of excavation depth of pit. The temperature affects the thickness of flat frozen soil wall significantly; the higher the temperature is, the larger the thickness is. Consequently, controlling the temperature is the key to the design of flat frozen soil wall. Thus, the results provide a basis for thickness determination of flat frozen soil wall with a large creep deformation.关键词
冻黏土/蠕变/流变理论/冻土墙Key words
frozen clay/ creep/ rheological theory/ frozen soil wall分类
建筑与水利引用本文复制引用
张向东,傅强..冻土三轴蠕变特性试验研究及平面冻土墙厚度的确定[J].岩土力学,2011,32(8):2261-2266,6.基金项目
国家自然科学基金项目“高速铁路风积土路基的振(震)陷变形试验研究”(No.5097813) （震）
辽宁省高等学校优秀人才支持计划项目“风积土冻胀与融沉特性及工程防治措施的研究”资助(No.2008RC23). （No.2008RC23）
