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| Mechanism of cracking-before-injecting method to prevent coal burst and its field test |
| LIU Jinhai1,YANG Weili2,JIANG Fuxing3,GUO Xinshan4 |
| (1. Hebei State Key Laboratory of Mine Disaster Prevention,North China Institute of Science and Technology,Beijing 101601,China;2. Architectural Engineering Department,Zhongyuan University of Technology,Zhengzhou,Henan 450007,China;3. School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;4. Shandong Energy Group Co.,Ltd.,Jinan,Shandong 250014,China) |
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Abstract 为实现煤矿冲击地压的主动区域性防治,提出先裂后注冲击地压防治技术。首先,对常规冲击地压防治技术进行分类,分析常规冲击地压防治技术6个方面的局限性;其次,探讨先裂后注对煤层的作用过程,以及先裂后注防治冲击地压的机制;然后,总结硬煤压裂和软煤压裂2个现场试验的成果,分析先裂后注防治冲击地压的效果;最后,讨论先裂后注冲击地压防治技术的不足,以及现场可能出现的问题及相应原因。研究表明,先裂后注对煤层的作用包括裂化煤层和湿润煤层,其中裂化煤层能够起到弱化蓄能能力、均化应力、孤立冲击体的作用,宏观上改变了煤体的完整性和应力分布特征;湿润煤层能够降低煤层冲击倾向性,细观上改变了煤体的脆性、储能与耗能特性。研究结果对推广应用煤层压裂技术和实现冲击地压主动区域性防治,具有十分重要的意义。
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