RESEARCH ON EXCAVATION DAMAGE ZONE OF UNDERGROUND POWERHOUSE OF DAGANGSHAN HYDROPOWER STATION
ZHU Zeqi，SHENG Qian，ZHANG Yonghui，LI Yangfan
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Taking underground powerhouse of Dagangshan hydropower station as the research object， distribution range and damage deteriorating characteristics of excavation damage zone(EDZ) of underground chambers are studied through mechanical properties testing and long-term monitoring of the surrounding rock mass at construction stage. Based on measured displacements and observed EDZ，a method of back analysis is established by using the orthogonal design，support vector machine and particle swarm optimization. By testing，monitoring and back analysis of the EDZ，it?s found that the EDZ scope is within a range of 3–7 m；and different surrounding rock classes have different EDZ distribution ranges and different damage deterioration degrees. The results show that the better quality of surrounding rock mass is，the smaller scope of the EDZ is，and the higher damage deterioration degree of the EDZ is. The study which needs further theoretical and application research is preliminary；and it has certain reference value for design and construction of similar major projects.
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2013, Vol. 32 
