广州某地铁人工冻结法施工热力分析  

Thermal and Mechanical Analysis of the Artificial Freezing Method Applied to A Subway Tunnel in Guangzhou

作　　者：李双洋[1] 张明义[1] 高志华[1] 张淑娟[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2006年第6期823-832,共10页Journal of Glaciology and Geocryology

基　　金：国家杰出青年科学基金项目(40225001);中国科学院知识创新工程重大项目(KZCX3-SW-351资助

摘　　要：以广州某地铁采用人工冻结法施工为例,考虑相变和衬砌水泥水化热的生成,根据带相变瞬态温度场的热量控制微分方程,采用伽辽金法推导出的有限元计算公式计算分析了此地铁人工冻结施工过程中的温度场分布规律.并根据温度场的分布特点,确定了开挖时的人工冻结壁厚度.最后,对冻结壁和其周围土体分别应用不同的力学本构模型进行施工过程的力学模拟.结果表明,采用人工冻结法作为一种辅助的施工方法,不但能满足施工过程中结构的强度要求,而且能满足环境沉降量的要求.In this paper, a subway tunnel in Guangzhou constructed by employing artificial freezing method is taken as an engineering example. Firstly, based on the governing differential equations of the transient temperature field with phase change and heat of hydration of lining cement, the temperature fields are analyzed through using finite element formulae deduced by Galerkin method. Then, according to the features of the temperature field, a frozen wall is determined, and the stresses and displacements of soils lyzed through using creep are computed and anaconstitutive model for frozen soil and elastoplastic constitutive model for unfrozen soil. The results show that, as an auxiliary method to construct a tunnel, applying artificial freezing method to construct tunnel can satisfy not only the strength requirement of structures but also the requirement of settlements of ground surface.

关 键 词：人工冻土 地铁 温度场 位移场 

分 类 号：P642.14[天文地球—工程地质学]