冲击地压煤层复合多灾协同防治技术及应用

    Collaborative control and prevention technology of muti-disaster control of rock burst coal seam

    • 摘要: 矿井深部开采过程中呈现出冲击地压、瓦斯、自然发火等多灾害共生、耦合等特点,灾害之间具有诱发、转化、耦合等关联现象,且致灾机理复杂。不同灾害的单项治理措施隶属于不同部门,导致治理措施协同效果差及治理尚缺乏针对性的技术方法。基于此,讨论了冲击地压多灾害共生及致灾的现状,提出了冲击地压复合多灾的概念及灾害复合方式,结合各灾害治理中用到的水力化措施及其时空关系,提出了冲击地压煤层“钻-割-压-抽-注”多灾害协同防治方法并在唐口煤业6304工作面进行了工业性试验。通过对顺层长钻孔顺序实施钻进、水力割缝、水力压裂、瓦斯抽采、煤层注水、压注阻化剂等技术措施,实现局部高应力的有效释放、煤岩力学性质的改变,煤层透气性的大幅度提高,煤体注水湿润半径的增大和煤体含水率的增加,降低煤炭自燃的危险性,实现了多种灾害协同防治。

       

      Abstract: The characteristics of multi-disaster symbiosis and coupling, such as rock burst, gas and spontaneous combustion, are presented in the process of deep mining. There are induced, transformed and coupled correlation phenomena among disasters, and the disaster causing mechanism is complex. The single control and prevention measures of different disasters belong to different departments which lead to the poor synergy effect of management measures and the lack of targeted technical methods. Based on this, the present situation of rock burst multi-disaster symbiosis and disaster causing is discussed, and the concept of rock burst multi-disaster and disaster compound mode are proposed. Combined with the hydraulic measures used in disaster management and their temporal and spatial relationships, a multi-disaster cooperative prevention method of “drilling-hydraulic cutting-hydraulic fracturing-gas drainage-inhibitor solution injection” for rock burst coal seam was proposed, and the industrial test was carried out in 6304 working face of Tangkou Coal Mine. Through the sequence of drilling, hydraulic fracturing, hydraulic fracturing, gas extraction, coal seam water injection, pressure injection inhibitor and other technical measures, the effective release of local high stress, the change of mechanical properties of coal rock, the significant improvement of coal permeability, the increase of moisture radius of coal body water injection and the increase of coal body water content are realized, and the risk of coal spontaneous combustion is reduced. Coordinated disaster prevention and control has been achieved.

       

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