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| STUDY OF STRESS STATE OF COAL PILLAR IN FAILURE ZONE OF COAL SEAM UNDER DYNAMIC PRESSURE OF MINING |
| WANG Hongwei1，JIANG Yaodong1，2，DENG Baoping3，ZHAN Shaojian1 |
| (1. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；2. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China；3. Shanxi Coking Coal Group Co.，Ltd.，Taiyuan，Shanxi 030000，China) |
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Abstract The field investigation of the geological conditions，the physico-mechanical characteristics of the surrounding rock and the hydrological conditions of mining areas in Fenxi，together with an intensive geological detection with the method of transient electromagnetic in the typical failure zones in Xinliu coal mine was carried out. A similarity model of the failure zones was developed based on the results of the geological detection and the stress state in the pillar affected by the dynamic pressure during mining was studied. The stress state of pillar changes little and remains the initial state within a period of time in the process of longwall mining. The increase of pillar stress occurs firstly at the distance of 62.5 m ahead of the working face，while a significant accumulation appears at the pillar 12.5–25.0 m ahead of the longwall mining face. In the process of pillar extraction，the high compression stress controls the elastic core in the pillar and remains at a high level under the effect of dynamic pressure. Meanwhile，the elastic core moves forward along with the advancing of the longwall mining face and bring about the severe risks to the coal mine. Therefore，the elastic core should be destroyed by pre-unloading，so as to ensure the safety in pillar extraction.
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Received: 12 December 2013
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2014, Vol. 33 
