Research on gel plugging and fire prevention technology for roadway excavation in residual coal re-mining area
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摘要:
采空区中遗留煤炭自燃现象直接影响着煤矿的安全高效开采，而采用堵漏材料封闭漏风通道是解决采空区煤自燃问题的有效方法。以运河煤矿F1301复采工作面为工程背景，针对在采空区中掘进巷道时遗留松散煤体的自燃隐患问题，制定了松散煤体凝胶堵漏防灭火技术实施方案，采用COMSOL数值模拟方法研究了不同注胶时间与压力下的凝胶扩散规律，并进行了工程应用。结果表明：注胶时间和压力与凝胶扩散范围成正比，综合考虑注胶效果与成本，选取10 MPa、140~160 min为最佳的注胶压力与时间，注胶钻孔间距设置为5 m；实施凝胶堵漏防灭火方案后，巷道两侧观测钻孔监测数据显示，标志气体CO体积分数稳定于24×10−6以下，凝胶堵漏防灭火效果良好，有效消除了采空区遗留煤炭自然发火隐患。
Abstract:The phenomenon of spontaneous combustion of coal left in the goaf directly affects the safe and efficient mining of coal mines, and the use of plugging materials to close the air leakage channel is an effective method to solve the problem of spontaneous combustion of coal in the goaf. Taking the F1301 re-mining face of Yunhe Coal Mine as the engineering background, aiming at the hidden danger of spontaneous combustion of loose coal left in the tunneling roadway in the goaf, the implementation scheme of gel plugging and fire extinguishing technology for loose coal was formulated. The COMSOL numerical simulation method was used to study the gel diffusion law under different injection time and pressures, and the engineering application was carried out. The results show that the injection time and pressure are proportional to the gel diffusion range. Considering the injection effect and cost, 10 MPa and 140-160 min are selected as the best injection pressure and time, and the distance between the injection holes is set to 5 m. After the implementation of the gel plugging fire prevention and extinguishing scheme, the monitoring data of the observation boreholes on both sides of the roadway show that the volume fraction of the iconic gas CO is stable below 24×10−6, and the gel plugging fire prevention and extinguishing effect is good, which effectively eliminates the hidden danger of spontaneous combustion of coal left in the goaf.
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图 5 不同注胶压力、时间下凝胶扩散形态变化云图
Figure 5. The cloud diagrams of gel diffusion morphology changes under different injection pressure and time conditions
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图 7 凝胶扩散面积占比随时间变化曲线
Figure 7. The curves of the proportion of gel diffusion area with time
表 1 数值模拟方案
Table 1 Scheme of numerical simulation
序号 注胶压力/MPa 时间/min 渗透率/m2 孔隙率 1 2 180 5×10−15 0.4 2 4 180 5×10−15 0.4 3 6 180 5×10−15 0.4 4 8 180 5×10−15 0.4 5 10 180 5×10−15 0.4 6 12 180 5×10−15 0.4 
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