冻土强度研究的现状分析

A State of the Art for Strength of Frozen Soils

冻土的强度是寒区工程中普遍关心的力学参数.研究表明,温度、含水量、应变速率和围压是影响冻土强度的主要因素,引用前人文献中的试验数据,分析了不同因素对冻土强度的影响规律;研究发现冻土的破坏形式与融土相似,然而其影响因素及机理不同;目前已有的冻土强度准则都是由融土的相关理论发展而来,但是由于涉及影响因素众多,强度准则尚待进一步研究改进.

Strength of frozen soils is one of the most commonly concerned mechanical parameters in cold regions engineering. This paper firstly reviews the mechanism of strength of frozen soils. Temperature, water content, strain rate and confining pressure are considered as the most important factors influencing the strength of frozen soils, and their roles in strength of frozen soils are analyzed by quoting testing results from published literatures. The failure patterns of frozen soils are found to be similar to those of unfrozen soils, while its influencing factors are different. The strength criteria for frozen soils are found to be developed from those for unfrozen soils. Due to so many influencing factors, the strength criteria proposed so far are yet to be improved.