薄基岩风氧化带附近防水煤岩柱的合理留设

为了合理确定鲁西煤矿的开采上限，依据已有的钻孔资料以及水文地质补充勘探资料，对第四系下部隔水层情况、基岩厚度、基岩岩石力学参数、基岩风氧化带等条件进行综合分析，然后对比鲁西煤矿实测资料、“三下”规程经验公式以及兴隆庄矿薄基岩条件下的经验公式分别得出的导水裂缝带发育高度，确定应用“三下”规程中的经验公式预计3111_II工作面开采后覆岩裂缝带发育高度，选取覆岩岩性为“中硬”，取中误差为0。结果表明：利用该方法确定3煤分叉区只开采下分层，留设防水安全煤岩柱高度为38 m，3煤合并区按照2个分层开采，留设的防水安全煤岩柱高度为49 m。

Reasonable Preserve of Waterproof Pillar nearby the Thin Bedrock Efflorescent Oxygenized Belts

In order to determine the upper mining limit reasonably，according to the current drilling data and supplementary exploration data for hydrogeology in Luxi Coal Mine，a comprehensive analysis of the Quaternary lower water-resisting layer，the thickness of bedrock，rock mechanical parameters of rock and rock wind oxidized zone condition was made.Then compared the height of water conducting fracture zone from the measured data of Luxi Coal Mine，the empirical formula of “three-underground” procedures and the empirical formula under thin bedrock of Xinglongzhuang Coal Mine，the empirical formula of “three-underground” procedures was adopted to predict the crack height of overburden rock fracture zones after mining in the 3111II working face，obtaining strata lithology as “medium hard” and the mean square error 0.The conclusion was drawn that only lower part of No.3 coal layer in bifurcation area was determined to be explored with the height of waterproof coal/rock pillar of 38 m，and No.3 coal layer in the combined area was explored by two sub-levels with height of waterproof coal/rock pillar of 49 m.