淋涌水碎裂煤岩顶板煤巷破坏特征及控制对策研究

FAILURE CHARACTERISTIC OF COAL ROADWAY WITH WATER SPRAYING AND GUSHING IN FRAGMENTATION ROOF AND ITS CONTROL COUNTERMEASURES

针对淋涌水碎裂煤岩顶板煤巷支护过程中出现的围岩剧烈破坏难题,综合现场调研、煤岩试验、数值模拟、理论分析及井下试验与实测等方法,对其变形破坏机制、工字钢与锚杆(索)支护位移场的分布及煤巷动态破坏特征、顶板钻孔淋水量分区、新型防水锚固剂的锚杆(索)锚固力测试及淋涌水碎裂顶板控制对策进行系统化研究,主要研究内容及结论如下:(1)淋涌水碎裂煤岩顶板的破坏主要是支护结构体的非整体性承载、锚杆(索)支护受钻孔淋水持续弱化失效以及顶板复合煤岩结构刚强度差异大而导致的离层综合作用的结果;(2)研究新型防水树脂锚固剂,并通过井下淋涌水顶板锚杆(索)拉拔试验及支护后期锚索监测结果,检验防水锚固剂稳定性能;(3)提出控制淋涌水碎裂顶板的"四位一体"控制对策,分析具体支护措施力学效应及保持顶板稳定性方面的作用;(4)详细介绍井下运用"四位一体"综合控制系统的一典型淋涌水型碎裂煤岩顶板煤巷成功实例。研究成果可在霍州矿区进行推广应用,对类似条件巷道支护技术具有一定的理论和实用价值。

Aiming at the problem of surrounding rock violent failure of coal roadways with water spraying and gushing and fragmentation roof in the period of supporting and service processes,combining the field investigation,rock and coal experiment,numerical simulation,theoretical analysis and field test,the deformation mechanism of roadway,distribution of surrounding rock displacement field with I-steel support and bolt support and the corresponding dynamic failure characteristics,water spraying quantity of roof borehole,anchoring force test of bolt and cable applying new waterproof anchor agent and control measurement of fragmentation roof are researched systematically.Main contains and conclusions are as follows.（1） The destruction of fragmentation coal roof with water spraying and gushing mainly are the comprehensive actions of partial loading of support structure,invalidation of bolt and cable supporting weaken by water spraying of borehole and bed separation induced by large difference of rigid strengths of roof composite coal structure.（2） The new waterproof resin anchor agent is researched;and its stability performance is proved by both the bolting test in the fragmentation coal roof with water spraying and gushing and the later monitoring results of the cable.（3） The controlling countermeasures for the fragmentation coal roof with water spraying and gushing,which is called as ＂one system with four aspects＂,are proposed;and the corresponding mechanical effect and the function to keep the roof stability of the concrete supporting measures are analyzed.（4） A typical successful case with the comprehensive controlling countermeasures of ＂one system with four aspects＂ applied to the fragmentation coal roof with water spraying and gushing is introduced in detail.The research achievements have been adopted in Huozhou mining and have the theoretical and practical values for the support technology of roadways with analogous conditions.