Study on thin bedrock deformation and strata behavior in coal seam mining under ultra-thick unconsolidated strata
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摘要: 以赵固一矿12051综采工作面为研究对象，采用UDEC数值模拟软件对巨厚松散层条件下煤层开采薄基岩变形及矿压显现进行了研究。结果表明：① 工作面初次来压步距为55 m，周期来压步距为15 m；开采后上覆薄基岩出现垮落带和裂隙带，垮落带高度为12.4 m，垮采比为3.54，裂隙带高度为36.7 m，裂采比为10.48。② 随着工作面推进距离的不断增加，工作面前方支承压力影响区范围、支承压力峰值和塑性区范围均增加；当基本顶初次来压后，工作面前方支承压力处于稳定状态，主要表现为最大应力集中系数和塑性区范围基本保持不变。研究结果可为类似地质条件下综采工作面围岩控制提供依据。Abstract: Taking No.12051 fully-mechanized coal face of Zhaogu No.1 Coal Mine as research object, thin bedrock deformation and strata behavior in coal seam mining under ultra-thick unconsolidated strata were studied by use of UDEC numerical simulation software. The results show that the first weighting interval and periodical weighting interval of the coal face is 55 m and 15 m respectively. Caving zone and fractured zone appear in overlying strata after mining. The height of caving zone and fractured zone is 12.4 m and 36.7 m respectively. Ratio of caving zone height to mining height is 3.54 and ratio of fractured zone height to mining height is 10.48. Affected zone range of front abutment pressure, peak of front abutment pressure and plastic zone range increase with increase of coal face advancing distance. The front abutment pressure is stable after the first weighting at basic roof, which manifests in the maximum stress concentration factor and plastic zone range basically remain unchanged. The research results can provide basis for surrounding rock stability control of fully-mechanized coal face under the similar geological condition.
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