风氧化带内综放开采覆岩变异特征与矿压显现规律研究  

Research on strata behaviors and variation characteristics of overburden strata of fully mechanized top coal caving in mining efflorescent oxygenized zone

作　　者：田多[1] 赵启峰[1] 邵国安 师皓宇[1] 刘刚 石来阳 

机构地区：[1]华北科技学院矿井灾害防治河北省重点实验室,安全工程学院,北京101601 [2]中煤平朔集团有限公司,山西朔州036800

出　　处：《采矿与安全工程学报》2015年第5期808-813,共6页Journal of Mining & Safety Engineering

基　　金：中央高校基本科研业务费项目(3142013035,3142013100);河北省矿井灾害防治重点实验室自主课题项目(KJZH2013S03)

摘　　要：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。According to the site measured strata pressure information of the coal mining face in mining efflorescent oxygenized zone of coal seams in No.3 Coal Mine of China Coal Pingshuo Group Co. Ltd,the paper has discussed the obvious sectional variance features occurring in top coal and the overlying strata above mining face in efflorescent oxygenized zone, such as loose strata structure, low overburden rock strength, high plasticity property, strong hydrophilicity, serious sliming, and the obvious decrease of stability performance and bearing capacity. The mine strata-pressure behaviors of passing the efflorescent oxygenized zone of coal seams are mainly reflected in the following three aspects： periodic weighting distance shortened, both the maximum working resistance of hydraulic power support during roof pressurized period and the average working resistance during non-pressurized period increasing, and support dynamic load coefficient decreasing during passing the efflorescent oxygenized zone compared with outside the scope. The mechanism of the sectional variance in strata behaviors have been analyzed by using geological mechanics, from which the paper has shown that the geological incentive of the strata-pressure behaviors variability is the new type Soft Cushion effect caused by soft-broken surrounding rock,fractured and sliming rock mass and float coal auxiliary compression under the floor. The Soft Cushion effect will lead to lower working resistance of the supports. Then the characteristics of the support operation of working face have been analyzed and the adaptability of the powered supports has been assessed.

关 键 词：综放开采 风氧化带 围岩特性 支架载荷分布 矿压显现 

分 类 号：TD823[矿业工程—煤矿开采]