近厚松散含水层下综放覆岩破坏特征及安全开采分析
Failure Features of Overlying Strata in Conditions of Fully-mechanized Caving Mining Under Nearly Thick Unconsolidated Aquifer and Safety Mining Analysis
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摘要: 为研究距厚松散含水层较近的煤层综放开采覆岩的破坏特征，分析综放工作面开采的安全性，先对区域上覆地层的工程地质及水文地质特征进行了分析，并采用UDEC4.0数值模拟软件，分析了不同基岩厚度条件下综放开采覆岩变形破坏特征。研究结果表明，底部松散含水层富水性弱，补给条件差，可留设防砂煤柱；综放开采时，基岩厚度变化对工作面开采覆岩的移动变形破坏影响显著，垮采比为3.55，当其厚度小于40.4 m时，易引发压架及突水溃砂事故。Abstract: To research the failure features of overlying strata and safety mining of fully-mechanized caving mining in nearly thick unconsolidated formation, firstly, we analyzed the features of engineering geology and hydrogeology of layers in study area, and studied the failure features of overlying strata with different thickness of bedrock by UDEC 4.0. The results indicate that coal mining in this area can be with the sand-proof coal pillars because of the weaker watery at the bottom of loose aquifer and poor supply condition; under the conditions of fully-mechanized caving mining, with the bedrock thickness changing, the deformation and failure features of overlying strata have significant differences; when the caving-height ratio is 3.55, the thickness of bedrock is less than 40.4 m, the support crushing and water inrush accidents will be occurred easily in this situation.
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