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中文摘要：
利用大连理工大学新开发的“土工静力-动力液压-三轴扭转多功能剪切仪”，针对相对密度为30%的福建标准砂，在不排水条件下控制试验过程中主应力方向、中主应力系数、平均主应力保持不变，进行了单调剪切试验.以此着重探讨了主应力方向对有效内摩擦角、有效应力路径及应力-应变关系的影响。研究表明，主应力方向对在不排水条件下饱和松砂的单调剪切特性具有显著影响。
英文摘要：
The experimental tests on loose sands subjected to undrained monotonic sheafing with the relative density of 30% were performed by using the soil static and dynamic universal triaxial and torsional shear apparatus newly developed in Dalian University of Technology. A series of tests were conducted for loose sand under complex stress conditions with different coefficients of the intermediate principal stress, orientation of the principal stress and the mean principal stress. Based on the experimental results, the effects of orientation of principal stresses on the friction angles at phase-transformation state and peak stress state, stress-strain relations as well as effective stress paths were respectively examined. It was found that the undrained shear behavior of loose sands was considerably dependent on the orientation of the principal stress.
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