In order to research on the shear strength characteristics of expansive rock, the methods of direct shear and tri-axial test are used here to study the strength parameters of the typical expansive rock in Xinjiang in non-saturation and saturation state, and the residual strength under different shear number and fracture rock strength in different wetting and drying cycles are studied in the saturated situation after its remolding. Through the study, it is found that the friction angle of small direct shear test is larger than that of medium-sized direct shear test, and the cohesion of both tests changes little. In saturated situation, the residual strength of expansive rock is in close proximity to the strength of fully developed cracks, so the residual strength could be approximately used as the strength of the expansive rock in crack-developed regions.%为了研究膨胀岩的剪切强度特性,通过直剪与三轴试验对新疆某地区典型膨胀岩分别在非饱和状态与饱和状态下的强度参数进行研究,并对其在重塑后饱和状态下经不同剪切次数下的残余强度以及在不同干湿循环次数下的裂隙强度进行研究,研究发现小型直剪的摩擦角比中型直剪的摩擦角大,而粘聚力变化不大.饱和状态下的残余强度与裂隙充分饱和强度相差不大,故也可用其作为裂隙发育区的强度指标近似值.
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