在伺服控制双轴加载系统下对预制的不同角度多裂纹水泥试件进行了单轴和双轴加载试验 ,其中的双轴加载采用两种不同的侧压。另外借助有限元计算得出了试件的全场应力 ,进而计算出试件中裂纹尖端的应力强度因子。试验和计算结果都表明 ,不同的裂纹角度对试件的断裂破坏强度有明显的影响 ,并对其原因进行了研究 ,所得结论可为地下工程中存在多裂纹的情况提供理论和工程应用依据 Uniaxial and biaxial loading tests were carried out on prefabricated multi-cracked cement specimens under servo-controlled two-axis loading system. Two different lateral pressures were used for biaxial loading. In addition, the full field stress of the specimen was calculated by means of finite element analysis, and then the stress intensity factor of the crack tip in the specimen was calculated. The experimental results and the calculated results show that different crack angles have a significant effect on the fracture failure strength of the specimens and the reasons have been studied. The conclusions can provide theoretical and engineering basis for the existence of multiple cracks in the underground works