摘要
应用地层人工冻结技术形成冻结围护结构过程中伴随着明显的冻胀效应,赋予了结构侧向土压力新的内容和特点,传统的土压力计算方法不再适用。为了量化确定冻结结构土压力,将人工冻结技术应用于基坑开挖围护的过程抽象为热—应力耦合的非线性应力—应变关系问题。借助于有限单元法,通过冻胀效应改造结构应力场环境的分析,获得冻结围护结构侧向土压力的解答,为提高结构设计的安全性提供可靠的依据。
Since the introduction of the AGF（artificial ground freezing） into engineering,researchers together with the engineers have made great efforts to seek economically reasonable approach to the frozen support structure design.Due to the accompanying freezing heave behavior with the frozen support structure formation while applying the AGF,the soil pressure against the structure has new features,so the traditional methods of soil pressure computation are no longer suitable.In order to measure the soil pressure against the frozen structure,the application process of AGF to form the pit excavation support structure was abstracted as a nonlinear stress—strain problem coupled with heat and stress.In virtue of the FEM（finite element method）,solutions to the soil pressure against the side of structure were obtained,which provides reliable basis for security improvement of structure design.
出处
《解放军理工大学学报（自然科学版）》
EI
2008年第1期62-66,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
关键词
冻结围护结构
冻胀效应
土压力
frozen support structure
freezing heave behavior
soil pressures
