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| Influence analysis of cracking strength and interaction of hydraulic pressure tunnel lining |
| LIU Lipeng1, WANG Yanbing2, SONG Qian3
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1. China Institute of Water Resources and Hydropower Research, Beijing 100048, China;
2. State Grid Economic and Technological Research Institite Co., Ltd., Beijing 102209, China;
3. State Grid Corporation of China, Beijing 100031, China |
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Abstract Using the numerical simulation model, the effects of the surrounding rock deformation capacity, lining concrete label, backfill grouting pressure, and grouting stone deformation capacity on the hydraulic head of the hydraulic pressure tunnel lining and the joint bearing ratio of the surrounding rock and lining were analyzed. The result showed that: the elastic modulus of the surrounding rock had a significant effect on the joint bearing ratio of the surrounding rock and the lining. When the higher the elastic modulus of the rock mass, the greater the load shared. The effect of the lining concrete label and the grouting stones was small, and the backfill grouting pressure had no effect basically. The modulus of surrounding rock and grouting stones, grouting pressure increased, and the internal water head required for lining cracking increased. The influence of elastic modulus of surrounding rock and backfill grouting on cracking head was more obvious, but due to the concrete rank increase, the lining load sharing ratio increased, and the lining cracking head gradually decreased. The research results could provide support for the design of hydraulic pressure tunnel lining and the reasonable selection of grouting parameters.
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Published: 25 February 2021
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