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Abstract A borehole was drilled in granodiorite rockmass at Fangshan，Beijing. The depth of the borehole is 301 m with diameter of 110 mm. From about 30～301 m，all cores were oriented by cement end cap method. AE Kaiser 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.
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Received: 24 March 2003
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