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为了改善本煤层瓦斯抽采钻孔的封孔效果,解决本煤层瓦斯抽采钻孔封孔段易失稳的现实难题,通过数值模拟的手段,分析对比了单裂隙注浆和无裂隙注浆这2种方法中浆液的渗透范围,得出在钻孔单裂隙注浆中浆液的渗透以从裂隙面渗透为主,浆液能够很好的充填煤体中的裂隙。在此基础上,认为采用煤岩体注浆技术可以把某些可凝浆液注入到煤岩体的裂隙或孔隙中,使煤岩体形成强度高、抗渗性好、稳定性高的新结构体,从而改善煤岩体的物理力学性能,提高煤岩体稳定性,为本煤层瓦斯抽采钻孔的高效密封奠定基础。
In order to improve the sealing effect of the gas drainage borehole in the coal seam and solve the practical problem of the unstable sealing of the gas drainage hole in the coal seam, numerical simulation is used to analyze and compare the single-fracture grouting and the non-fracture grouting The penetration range of the slurry in the two methods shows that the infiltration of slurry in the single-hole grouting of the borehole is mainly caused by the infiltration of the fracture surface, and the slurry can well fill the cracks in the coal body. On this basis, it is considered that the grouting technology of coal and rock mass can inject some condensable slurry into the cracks or pores of coal and rock mass, and make the coal and rock mass form a new structure with high strength, good impermeability and high stability So as to improve the physical and mechanical properties of coal and rock mass, improve the stability of coal and rock mass, and lay a foundation for efficient sealing of the gas drainage borehole of the coal seam.