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Abstract To acquire the seepage characteristics of fractured rock mass under the dam foundation of Xiangjiaba hydropower station，high pressure seepage test system and experimental method are researched based on spatial distribution of fractured rock mass. An in-situ high pressure seepage test method for the seepage of dam foundation fractured rock mass is proposed. The focus of this study is that the in-situ seepage deformation is researched by method of comparative analysis of water quality and video in measured borehole. Basic criterion is put forward to determine critical hydraulic gradient. Study results indicate that the critical hydraulic gradient obtained from in-situ seepage test is more reasonable than that of indoor test because in-situ high pressure seepage test method can reflect the actual environment state of fractured rock mass better.
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Received: 20 April 2009
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