突出煤层综采工作面小煤柱掘进技术
Small Pillar Driving Technique in Fully Mechanized Working Face of Outburst Coal Seam
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摘要: 针对寺家庄矿15#煤层综采工作面小煤柱掘进过程中由于煤与瓦斯突出风险大和巷道稳定性差等因素带来的安全问题,采用理论计算、数值模拟及现场试验等方法对综采工作面沿空掘巷煤柱尺寸及现场实践效果进行研究。结果表明:工作面上覆岩层侧向结构中存在着影响应力分布的关键块体,通过分析、计算得到煤柱尺寸存在临界值,当煤柱尺寸超过该值时,煤柱应力显著升高,不利于回采巷道稳定性;通过对煤柱应力分布数值模拟和现场测试,结合开采安全性分析,确定寺家庄矿15106综采工作面煤柱尺寸为7 m;按照已确定的煤柱尺寸进行小煤柱沿空掘巷后,顶底板最大移近量约324 mm,两帮最大移近量约224 mm,较未采用沿空掘巷方法时分别降低了42%、29%,掘进回风瓦斯浓度最大0.35%,平均0.15%,防突钻孔的工程量减少约2/3,15106工作面进回风巷月平均进尺提高至原始煤体中月平均进尺的2.35倍。Abstract: Aiming at the safety problems caused by poor roadway stability and other factors during gob-side entry driving of 15106 isolated island face in Sijiazhuang Mine, theoretical calculations, numerical simulations and field tests were adopted to determine the coal pillar size and field practice effect of gob-side entry driving in isolated face. The results show that there are key blocks in the lateral structure of the overlying strata on the isolated face that affect stress distribution. Through analysis and calculation, there is a critical value for the coal pillar size for gob-side entry driving. When the size of coal pillar exceeds this value, the stress of coal pillar increases significantly, this is not conducive to the stability of stoping roadway. Through numerical simulation and field test of coal pillar lateral stress distribution, combined with mining safety analysis, the coal pillar size of 15106 isolated island face in Sijiazhuang Mine was determined to be 7 m. After the gob-side entry driving with small coal according to the determined coal pillar size, the maximum approach amount of the top and bottom plates is about 324 mm, and the maximum approach amount of the two groups is about 224 mm, which are 42% and 29% lower than those when gob-side entry driving method is not used. The maximum concentration of return gas is 0.35% and the average is 0.15%, the amount of anti-outburst drilling works decreased by about 2/3, and the average monthly footage of the 15106 face into the return air lane increased to 2.35 times of the average monthly footage of the original coal body.
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