非饱和土渗流和变形强度特性的温度效应

TEMPERATURE EFFECTS ON SEEPAGE AND STRENGTH-DEFORMATION CHARACTERISTICS OF UNSATURATED SOILS

高放核废料地下处置、高压电缆埋设和地热开发等工程的发展,使得温度对非饱和土基本力学性质影响的研究逐渐成为当前岩土工程的热点.从渗流特性和变形强度特性两方面出发,分析了温度对非饱和土基本力学性质的影响.对于渗流特性,研究了温度对液相水和水蒸气运动的影响,并进一步综述了水热迁移模型的发展.对于变形强度特性受温度的影响,从试验研究和理论模型入手,研究了非饱和土的变形和强度等随温度的变化规律,并在此基础上对温度的影响进行了总结.文中还指出了现阶段研究中存在的问题及今后的研究方向.

With the development of geotechnical engineerings such as underground high-level nuclear waste disposal,high-voltage electrical power distribution,geothermal energy utilization etc.,more and more attentions have been paid on the temperature effects of unsaturated soils.Temperature effects on basic mechanical properties of unsaturated soils are analyzed in terms of both the seepage and strength-deformation.As for temperature effects on seepage characteristics,the effects on the movement of liquid water and water vapor are studied,and the development of THM models is reviewed.As for temperature effects on strength-deformation characteristic,variation rules of the strength-deformation versus the temperature are studied both experimentally and theoretically,and a summary of the temperature effects is given thereby.Finally,some key problems in the current studies are pointed out as well as the development trends of further studies.