苏州地铁典型土层冻土力学特性研究  

Mechanical behavior research of typical frozen soil clay in Suzhou subway

作　　者：贺俊[1] 杨平[1] 何文龙[1] 

机构地区：[1]南京林业大学土木工程学院,南京210037

出　　处：《水文地质工程地质》2010年第5期72-76,共5页Hydrogeology & Engineering Geology

基　　金：苏州市科技局苏州轨道交通专项课题(ZXJ0802)

摘　　要：人工冻结法已经并将大量用于苏州轨道交通连通道及盾构进出洞施工,而冻土力学特性是冻结法设计所需的重要参数,此前尚无苏州地区冻土物理力学参数相关试验研究资料,若参考其它地区参数进行冻结设计将会给施工带来许多不确定性。本文以苏州地铁典型土层为研究对象,对其冻土抗压强度、弹性模量、泊松比进行室内试验研究,根据试验数据曲线,分析总结了抗压强度随不同温度、含水率、干密度的破坏形态和变化规律以及弹性模量、泊松比随温度变化的规律,并作出了定量和机理分析,研究成果对苏州轨道交通建设冻结法设计指标的确定具有重要参考价值。The artificial freezing method has been more and more widely used in tunnel construction for Suzhou subway（such as the soil reinforcement of by-pass and shield passing in and out of working pit construction）.The mechanical behavior of frozen soil is a required parameter in designing the method.For now,no experimental research data about physical and mechanical behavior of frozen soil is available in Suzhou,but refering to the parameters of other places will bring many uncertainties to the construction.In this article,the typical underground soil from Suzhou was employed to conduct the in-door study for compressive strength,elastic modulus and poisson’s ratio.By analyzing the data and the curves,the regular pattern that the compressive strength changes by the influence of temperature,water content,dry density was proposed.In addition,the values of elastic modulus and the model of possion’s ratio to temperature were summerized.In the last,the quantitative analysis and mechanism analysis were carried out.The study result will be helpful in determining the designing parameters of freezing method in the construction of Suzhou subway.

关 键 词：人工冻土 抗压强度 温度 含水率 干密度 

分 类 号：TU445[建筑科学—岩土工程]