论文部分内容阅读
以平朔集团井工三矿风氧化带内综放开采实测矿压资料为依据,分析得出风氧化带内顶煤及覆岩强度低、结构疏松、塑性大、亲水性强、泥化程度高、自稳性能与承载能力显著降低等变异特征。风氧化带内开采,周期来压步距缩短,来压期间支架最大工作阻力、非来压期间平均工作阻力均增大,但支架动载系数减小。其地质力学诱因是风氧化围岩裂隙发育,松软破碎,煤岩体泥化,加之底板浮煤辅助压缩,形成的“软弱垫层”效应,导致支架增阻现象不明显。并分析了工作面支架运转特性,评价了支架对风氧化围岩的适应性。
Based on the measured data of fully mechanized top coal caving mining in the wind oxidation zone of Pingshuo No.3 coal mine, it is concluded that the top coal and overburden in the wind oxidation zone have low strength, loose structure, large plasticity, strong hydrophilicity, High degree of self-stability and carrying capacity decreased significantly and other variation characteristics. Wind oxidation zone mining, the cycle to shorten the pressure step to support the stent during the maximum working pressure, non-pressure during the average working resistance are increased, but the stent dynamic load factor decreases. The inducement of geomechanics is that the aeolian wall rock crack development, soft crushing, coal and rock body mud, combined with the floor floating coal auxiliary compression, the formation of “weak cushion ” effect, resulting in scaffolding resistance phenomenon is not obvious. The running characteristics of working face support were analyzed, and the adaptability of the support to wind-induced surrounding rock was evaluated.