相似方法在冻土低温三轴压缩试验研究中的应用

APPLICATION OF ANALOGY METHOD IN THE STUDY OF TRIAXIAL COMPRESSIVE TEST ON FROZEN SOIL AT LOW TEMPERATURES

主要介绍相似方法在冻土抗剪强度低温三轴压缩试验研究中的应用及若干关键科学问题。基于目前广泛应用的Bockinghamπ定理，采用量纲分析方法，并考虑冻土的本构方程、含水量与重度之间的关系，研究试件几何尺寸、试验控制条件、土性指标及冻土变形应力、应变之间的相似关系，求解冻土抗剪强度指标的相似解析式。据此，可由某一条件下冻土抗剪强度指标的试验测定结果，推求其他条件下冻土抗剪强度指标的相似计算值。试验结果表明，所得的冻土抗剪强度指标的相似解析式具有很高的推求计算精度，能够很好地应用于冻土工程及相关科学研究。

The technology and key problems of analogy method applied in the triaxial compressive test study of frozen soil are presented. Based on the theorem of Bockingham π which is widely applied at present, using the dimensional analysis method, and considering the relation of frozen soil＇s constitutive equation, water content and density, the analogical variables relations are studied and analogy relationships of shear strength indexes are obtained. Therefore, the analogical value of shear strength indexes at different test conditions can be deduced from a test result. Test results also validates that the deduced analogy relations of frozen soil shear strength indexes have good precision and can be adopted in frozen engineering and other relative study field. For the low temperature test with shortcomings of higher energy consuming, the longer time occupied, the higher money cost and the more difficulty to control test conditions, the study results presented here can reduce the same tests and have significance in practice.