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煤岩动力灾害结构场孕育演化及调控技术

Structural field breeding and evolution and control technology of coal-rock dynamic disasters

  • 摘要: 冲击地压、煤与瓦斯突出等是煤矿深部开采中的主要灾害来源,其诱灾机理极为复杂,迄今为止,仍未形成煤矿动力灾害的一体化防控技术。鉴于此,阐述了现有应力场、渗流场及温度场调控动力灾害的机制及其利弊;从煤岩结构演化视角出发,定义了结构场的概念,确定了煤矿动力灾害结构调控技术的内涵,揭示了煤矿动力灾害随结构场时空演化的孕育机制及作用机理,提出了煤矿动力灾害结构调控防治一体化技术,并详细分析了应力场、渗流场、裂隙场、温度场等与结构场之间的多场耦合关系,界定了结构场为一级主场,其余均为受结构场源头调控的二级分场;分析了结构调控技术具有主动性、定向性和综合性的特点,揭示了结构调控技术防治煤矿动力灾害的机理,提出了基于结构场演化规律和调控技术的动力灾害防治路径,此路径包括从采前结构设计、采中结构灾变防治到采后结构修复的全过程,实现动力灾害的高效防治。研究成果在内蒙古某典型冲击地压矿井进行工业性试验,结合现场实测数据和煤岩结构反演结果,发现结构调控技术能够有效改变上覆岩层的高低位致灾岩层结构,降低顶板的冲击危险性,减小巷道顶板及围岩的变形,验证了结构调控技术在冲击地压防治领域的高效性。同时在甘肃某突出矿井进行试验,发现盲目采取的钻孔抽采方案无法满足工程实际的需求,而经过结构调控视角设计的水力割缝技术实施后,工作面煤层中裂隙发育完全,贯通了瓦斯运移的通道,最终测定的瓦斯含量验证了上述结论的准确性。2种案例分别从冲击地压和煤与瓦斯突出灾害的视角验证了结构调控技术在煤矿动力灾害防治领域的科学性与合理性。

     

    Abstract: Rock burst, coal and gas outburst are the main disaster sources in deep coal mining, and their disaster inducing mechanism is very complicated. So far, there has been no integrated prevention and control technology for coal mine dynamic disaster. In view of this, the mechanism of stress field, seepage field and temperature field regulating dynamic disaster and its advantages and disadvantages are expounded. From the perspective of coal and rock structure evolution, the concept of structural field is defined, the connotation of coal mine dynamic disaster structure control technology is determined, the breeding mechanism and action mechanism of coal mine dynamic disaster with the space-time evolution of structural field is revealed, and the integrated technology of coal mine dynamic disaster structure control and prevention is proposed. The multi-field coupling relationship between stress field, seepage field, fracture field, temperature field and structural field is analyzed in detail. The structural field is defined as the primary field, and the rest are the secondary sub-fields regulated by the source of the structural field. This paper analyzes the active, directional and comprehensive characteristics of structural control technology, reveals the mechanism of structural control technology to prevent and control coal mine dynamic disasters, and puts forward a dynamic disaster prevention path based on the evolution law of structural field and control technology, which includes the whole process from pre-mining structural design, structural disaster prevention and control in mining to post-mining structural restoration, so as to achieve efficient prevention and control of dynamic disasters. The research results were carried out in an industrial test in a typical rock burst mine in Inner Mongolia, and combined with the field measured data and the inversion results of coal and rock structure, it was found that structural control technology could effectively change the high-low and low-level disaster-causing rock structure of overlying rock, reduce the roof impact risk, and reduce the deformation of roadway roof and surrounding rock, which verified the high efficiency of structural control technology in the field of rock burst prevention. At the same time, a test was carried out in an outburst mine in Gansu province, and it was found that the blind drilling and extraction scheme could not meet the actual needs of the project. After the implementation of the hydraulic slit technology designed from the perspective of structural control, the cracks in the coal seam in the working face were fully developed and through the channel of gas migration, and the final measured gas content verified the accuracy of the above conclusions. The two cases verify the scientificity and rationality of structural control technology in the field of coal mine power disaster prevention and control from the perspective of rock burst and coal and gas outburst disaster respectively.

     

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