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| IN-SITU TEST ON DIVERSION TUNNEL AT JINPING II HYDROPOWER STATION I—TEST DESIGN |
| ZHANG Chunsheng1，CHU Weijiang2，HOU Jing1，CHEN Xiangrong1，WU Xumin1，LIU Ning1 |
(1. PowerChina Huadong Engineering Corporation，Hangzhou，Zhejiang 310014，China；
2. HydroChina ITASCA R and D Center，Hangzhou，Zhejiang 310014，China) |
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Abstract The large scale in-situ test is an important method to solve complex engineering problems. During the construction of diversion tunnels at Jinping II hydropower station，an in-situ test program to monitor the realtime response of the surrounding rocks of the diversion tunnel excavated with TBM was designed and implemented. The contents of the in-situ test program include the stress measurement of rock mass with the rock stress meters of vibrating wire and CSIRO HI Cells to record the stress change in rock mass during tunneling，the acoustic emission monitoring to detect the crack initiation and propagation in rock mass during excavation，the sonic velocity measurement to determine the profile of excavation damage zone around tunnel，the displacement measurement with the multipoint displacement meters and fiber Bragg grating sensors to obtain the deformation of rock mass during tunneling，the digital photographing of borehole to observe the process of the macrocrack initiation. This article is the first of the series and introduce the background of the project，the designing of the in-situ test program，and the detailed geological models of the tested region.
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Received: 08 June 2013
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2014, Vol. 33 
