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Abstract With the development of engineering construction，the buried depth of underground cavern becomes larger and larger. The surrounding rock mass may deform seriously or suffer from rock burst disaster under the high in-situ geostress actions. In order to assure the stability and safety of underground cavern，the measurements and research on the in-situ stress situation，self bearing capacity of rock mass and the permeability of rock mass under high water head actions are specially focused on. For a deep-buried pressure cavern，if the hydraulic fracturing method is adopted to determine the 3D in-situ stress state，it is advisable to define the stress distribution state in the rock mass. Only to calculate and analyze the stress states of stress relaxation zone，stress concentration zone and undisturbed stress zone can reveal the 3D stress distribution characteristics in rock mass around a cavern. For the hydraulic jacking test results to define the bearing capacity of rock mass around the pressure cavern，only the comprehensive analysis including the analysis of joint features and rock mass structures can precisely define the bearing capacity of surrounding rock mass. As the existed weak discontinuity planes in the rock mass may be cracked or expanded under the actions of high pressure，the permeability performance of rock mass is changed accordingly. Therefore，only the high-pressure water test is conducted in accordance with the actual pressures on the rock mass structures under the opeartion state of project to get the reliable data of the rock mass permeability.
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Received: 17 April 2007
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