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在土力学中,静止侧压力系数(K0)是一个重要的力学参数。对于融土,K0同土的干密度、土质和受力历史等因素间存在着密切的联系;对于冻土,由于土中冰的存在,K0同温度间也存在着紧密的联系。本文对两种不同土质的冻土样进行了K0试验,研究表明温度、干密度、土质以及受力历史均同冻土的侧压力系数存在着独特的内在联系。根据试验结果,K0同温度、粉粘粒含量和加载次数成正比而与干密度成反比;同时,由这些因素导致的K0的差异会随着轴压增大而逐渐减小。另外随着冻土温度的降低,受力历史对K0的影响也逐渐增大。因此,在工程计算分析中应充分考虑这些因素对侧压力系数的影响。
In soil mechanics, the static lateral pressure coefficient (K0) is an important mechanical parameter. There is a close relationship between K0 and the dry density, soil quality and the history of stress, and the relationship between K0 and temperature in frozen soil due to the presence of ice in the soil. In this paper, K0 tests were carried out on two kinds of frozen soils with different soil types. The results show that temperature, dry density, soil quality and history of stress have a unique intrinsic relationship with the lateral pressure coefficient of frozen soil. According to the test results, K0 is in direct proportion to the temperature, the content and load of powdery clay and inversely proportional to the dry density. Meanwhile, the difference of K0 caused by these factors will decrease with the increase of axial pressure. In addition, as the permafrost temperature decreases, the influence of force history on K0 also gradually increases. Therefore, in the engineering calculation and analysis should fully consider the impact of these factors on the lateral pressure coefficient.