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| PRELIMINARY INVESTIGATION ON DISPLACEMENT PREDICTION OF LARGE UNDERGROUND CAVERNS |
| CHEN Fei1，2，DENG Jianhui3，4，HE Chuan1，2，WEI Jinbing3，4，GAO Chunyu3，4 |
| (1. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3. State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China；4. College of Water Resources and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China) |
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Abstract For rock masses，displacement is a parameter that can be easily measured and controlled；and its magnitude and rate are the basic parameters for evaluating the stability of rock masses or for displacement control in tunnels. However，such a standard is still not established for large underground caverns. Based on the measured displacements of 6 large underground powerhouse caverns in Southwest China，factors that affect the displacement development in rock masses are summarized；and major factors，i.e. in-situ stress and rock mass quality are refined，which are then represented by the maximum in-situ stress and the saturated uniaxial compressive strength . The ratio of to ，i.e. is then introduced to describe the above two factors；and two empirical relations are established by regression method to describe its relation with the maximum and average displacements of the cavern sidewalls. The empirical relations give a good fitting result and can be used as reference for the monitoring design and precaution of displacement，and for the establishment of displacement control standard in large underground caverns. Possible improvements to the above empirical relations are finally analyzed.
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Received: 08 November 2012
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2013, Vol. 32 
