南方短时冻土的热物理性质及抗压强度特征  

Thermal physical performance and compressive strength characteristics of short-term frozen soil in southern area of China

作　　者：郭麒麟 孙云志 

机构地区：[1]长江岩土工程总公司(武汉),湖北武汉430010

出　　处：《人民长江》2012年第9期51-54,共4页Yangtze River

基　　金：国家"十一五"科技支撑计划项目(2008BAC47B01)

摘　　要：为探讨在极端冰雪条件下南方短时冻土的热物理性质及强度特征,在湖北、湖南、广西等地选取典型土样,对初始含水量不同的土样在不同温度下进行热物理参数和单轴抗压强度试验。结果表明:冻土的干密度越大,导热系数越大;含水量越大,导热系数越大;随着温度的升高,冻土的破坏应变呈现出增大的趋势,应力-应变曲线表现为弱应变软化型或应变硬化型,即冻土的塑性增强;冻土抗压强度随温度的降低而增大;相同温度条件下,饱水后冻土的单轴抗压强度大于等于饱水前的强度。In order to research the thermal physical performance and compressive strength characteristics of short-term frozen earth in the southern area of China,typical soil samples are collected in several provinces such as Hubei,Hunan and Guangxi,and tests on thermal physical parameters and uniaxial compressive strength for the soil samples with different initial moisture contents are conducted under different temperature conditions.The test result shows that the larger the dry density of frozen soil,the larger the thermal conductivity;the larger the water content,the larger the thermal conductivity.With increase of temperature,the failure strain of frozen soil has an increasing tendency,and the stress-strain curve is of a weak strain softening type or a strain hardening type,namely,its plasticity increases.With decrease of temperature,the compressive strength of frozen soil increases;under the same temperature condition,the uniaxial compressive strength of saturated frozen soil is larger than or equal to that before saturated.

关 键 词：极端冰雪条件 南方短时冻土 热物理性质 抗压强度 

分 类 号：P642.14[天文地球—工程地质学]