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| A CLASSIFICATION METHOD OF SURROUNDING ROCK MASS IN HYDROPOWER PROJECT IN HIGH GEOSTRESS AREA |
| SHEN Yanjun1，2，XU Guangli2，SONG Shengwu3，LI Zhipeng2，FENG Xuemin3，DONG Jiaxing4 |
(1. College of Architecture and Civil Engineering，Xi?an University of Science and Technology，Xi'an，Shannxi 710054，China；
2. Engineering Research Center of Rock and Soil Drilling and Excavation and Protection of Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China；3. PowerChina Chengdu Engineering Corporation Limited，Chengdu，Sichuan 610072，China；4. Faculty of Electric Power Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650500，China) |
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Abstract The engineering geological characteristics of the surrounding rock of large hydropower caverns in high geostress areas are very different from those in the normal geostress area. So the rock classification and evaluation system should be different. However，the hydropower classification(HC) method of rock mass for evaluating the rocks in high geostress areas has still many defects，and has caused some deviations between the evaluated results and the real situations. The purpose of this paper is to correct and optimize the HC method in high geostress areas. Firstly，the problems existed in the HC method were analyzed comprehensively，and some appropriate amendments were proposed. Secondly，some new proposals for ground stress evaluation and classification criteria were proposed through extensive collecting and collating of the information of high geostress of the current large-scale hydropower projects. Then，the evaluation ideas and methods of HC for high geostress areas were optimized systematically and the corresponding methods of optimization were proposed. Finally，the plant of Houziyan hydropower station under construction was analyzed，and the comparative analysis was made to confirm the suitability of this optimization method.
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Received: 18 June 2014
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2014, Vol. 33 
