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| MONITORING ANALYSIS OF SECONDARY LINING STRUCTURE OF CENTRAL PUMP HOUSE IN DEEP COAL MINE |
| LIU Quansheng1，2，SHI Kai1，KANG Yongshui1，HUANG Xing1 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy
of Sciences，Wuhan，Hubei 430071，China；2. College of Civil Engineering and Architecture，Shandong University of Science
and Technology，Qingdao，Shandong 266510，China) |
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Abstract Based on the notion of the new Austrian tunneling method，the field monitoring of secondary lining structure of central pump house in Zhuji Coal Mine is conducted by displacement convergence gauge and steel-string sensors. And the time-dependent variation laws of surface displacement，contact stress between primary support and secondary lining，reinforcement stress and concrete strain are obtained. The monitoring results show as follows：(1) The surface displacement rate is larger at the early stage and the displacement is convergent after about 100 days of secondary lining construction. (2) The contact between primary support and secondary lining is close，which indicates that the secondary lining bears the load of surrounding rock effectively. (3) The reinforcement stress changes enormously at initial several days，then increases and achieves a steady state eventually. (4) The concrete strain is stable after experiencing a transformation from initial compressive strain to tension strain. By analyzing the monitoring data，the conclusions can be drawn as follows：(1) The final values of all monitoring items are within safety limit，which demonstrates the reliability and security of secondary lining structure. (2) The steel string sensors are easily affected by the hydration heat generated in the process of concrete hardening. (3) The mechanical state of secondary lining is disturbed by excavation of adjecent caverns.
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Received: 04 March 2011
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2011, Vol. 30 
