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RESEARCH ON EFFECTIONS OF EXCAVATION SCHEMES OF TBM ON RISK OF ROCK BURST OF LONG POWER TUNNELS OF JINPING II HYDROPOWER STATION |
| WU Shiyong1,ZHOU Jifang1,CHEN Bingrui2,HUANG Manbin3 |
| (1. Yalong River Hydropower Development Company,LTD,Chengdu 610051,China;2. Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;3. Shenyang Railway Survey Design Consulting Company Limited,Shenyang 110013,China) |
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Abstract To improve efficiency of construction and reduce the risk of site construction personnel and equipment,the 1#,3# diversion tunnel of Jinping II hydropower station adopt large-section TBM for construction. The full-section TBM construction under large buried depth,when encounter strong grade rock burst,it still may bring some damage to TBM equipment. Therefore,through the real time microseismic monitoring and numerical analysis,study the influence of TBM excavation scheme、heading construction on the risk of rock burst. The results show that,lowering the rate of construction,can reduce the risk of rock burst;pilot excavation and TBM joint construction is advantageous to prevent strong grade rock burst. The research results can provide important reference value for the safe and rapid excavation of TBM,will also provide reference for other similar project,it has an important engineering value.
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