| The threat of gas disaster accident has greatly limited the scale of the coal mine production and the improvement of production efficiency and economic benefit. The effective control of gas disaster is a key problem to guarantee the sustainable development of coal industry in China.According to on-site survey and experimental data, combined with the finite element simulation, this paper studies the reason that why gas drainage hole can't be into hole without any auxiliary measures. Using a model combined Mohr-coulomb model with elastic model, analysis obtains that external force can ensure pore-forming. With the simulation results and comprehensive analysis of field condition, optimal plan are selected, on the basis of which this research designs special equipment used in the'three soft' coal seam; Finally this paper studies the gas delivery law, gas content and gas parameters obtained in the field experiment of coal seam. Finite element model is established through the comparison of temperature field and seepage field, according to the splicing situation of coal mining in the field and related regulations, the terminal conditions are determined, the space between boreholes are obtained through the analysis of finite element simulation software ANSYS,, which provides scientific basis for the determination of the pace between borehole. |
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