【摘要】 在北京房山花岗岩体中钻了一个深301 m,直径101 mm的钻孔。从钻孔深度30～301 m,利用水泥端帽法对岩芯进行了定向。对深度270和294 m的定向岩芯进行了声发射Kaiser效应试验。水平面内最大主应力的方向基本为南北方向。将声发射Kaiser效应测量结果与水压致裂法的测量结果进行了对比,二者具有很好的一致性。更多还原

【Abstract】 A borehole was drilled in granodiorite rockmass at Fangshan,Beijing. The depth of the borehole is301 m with diameter of 110 mm. From about 30～301 m,all cores were oriented by cement end cap method. AEKaiser effect tests on oriented core at depth of 270 m and 294 m were carried out. In horizontal plane,the orientation of larger horizontal principal stress is about the NS. Comparison of the result of AE Kaiser effect tests with that of hydrofracturing shows that they are consistent fundamentally on the whole.更多还原