浆液在煤岩体裂隙中渗透规律的数值模拟
Numerical Simulation on Permeation Laws of Grouting in Coal and Rock Fracture
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摘要: 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。Abstract: To improve sealing effect of horizontal gas extraction borehole in current seam and solve the practical problem of gas extraction for boreholes with easy-failure sealing segment in soft coal mine with high content of gas, through numerical simulation method, the grouting penetration range of the single-fracture grouting method and no-fracture one was analyzed by the COMSOL Multiphysics software. The results show that the main penetration way of grouting is through the fracture surface in the single-fracture grouting method, which makes the slurry fill the fracture in coal well; the grouting technique can inject the seriflux into the fractures existing in coal and rock and make the coal and rock form new structures with high intention and stability, and improve the property and stability of coal and rock. The success of this project contributes to solve the difficulty encountered in high-efficiency dynamic sealing.
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Keywords:
- mine gas /
- permeability of coal and rock mass /
- fissure surface /
- borehole sealing /
- gas extraction
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