非饱和土抗剪强度几个问题探讨

Discussion on several problems for shear strength of unsaturated soil

鉴于非饱和土抗剪强度研究中一些值得注意的问题,回顾了非饱和土基质吸力与抗剪强度关系的部分研究成果;结合非饱和土应力理论的基本假定,阐述了研究体积含水率与土体抗剪强度关系的一个新观点;探讨了应力历史(包括吸力历史)对非饱和土强度的影响,并从该方面分析了目前等吸力试验方法的不足之处,认为改善吸力测试技术和提高吸力测试精度应是非饱和土强度特性研究的重要方向之一。以上观点和探讨将有利于所提问题的研究。

In view of the problems in the research of shear strength of unsaturated soils, some research results of the relationship between the shear strength and matrix suction of unsaturated soil were reviewed. According to the basic principle of unsaturated soil stress theory, a new research viewpoint of the relationship between the volatile water content and shear strength of unsaturated soil was proposed. The effects of the stress history（including suction history） on the strength of unsaturated soil were discussed, and the disadvantages of control suction test were analyzed. Improving the suction test technology and accuracy of suction test was considered to be one of the important research directions of the strength characteristics of unsaturated soil. The discussion in this paper can benefit the research of unsaturated soil strength.