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特大采高综采面关键层结构形态及其对矿压显现的影响

ISSN号：1000-6915
期刊名称：岩石力学与工程学报
时间：0
页码：1547-1556
分类：TD32[矿业工程—矿井建设]
作者机构：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221008, [2]中国矿业大学矿业工程学院,江苏徐州221116
相关基金：国家重点基础研究发展计划（973）项目（2007CB209403）; 国家自然科学基金重点项目（50834005）;国家自然科学基金资助项目（50974116）
相关项目：松散承压含水层下采煤关键层复合破断致灾机制研究

关键词：采矿工程, 岩层移动, 特大采高, 矿压显现, 关键层结构形态, 绿色开采, mining engineering, strata movement, super-large mining height, strata behaviors, key strata structural morphology, green mining

中文摘要：

通过对我国首个7.0 m支架综采工作面开采的现场实测、模拟试验与理论分析,就神东矿区特大采高综采工作面覆岩关键层结构形态及其对矿压显现的影响规律与支架合理工作阻力的确定等问题进行了深入研究。结果表明：由于特大采高工作面采高明显增大,覆岩亚关键层1易进入垮落带中,不能形成＂砌体梁＂结构,而呈＂悬臂梁＂结构周期性破断,形成工作面的周期来压,周期来压的持续长度与支架控顶距接近,较关键层＂砌体梁＂结构来压持续长度明显偏大。一定条件下,覆岩亚关键层2的周期破断会引起亚关键层1的提前破断,并造成工作面周期来压步距和来压强度呈一大一小的周期性变化。提出了特大采高综采面不同覆岩关键层结构形态时支架工作阻力的确定方法,并依此确定了补连塔煤矿22303工作面7.0 m支架的合理工作阻力为17 612 kN,现有支架额定工作阻力16 800 kN,在工作面部分区域略显偏小。

英文摘要：

By analyzing the data of field measurement,simulation experiments and theoretical analysis of the first fully-mechanized mining face with 7.0 meters height supports in China,the key strata structural morphology of the fully-mechanized face with super-large mining height in Shendong mining area and its influence on strata behaviors as well as the reasonable working resistance of the support are deeply studied.The results show that because of the obviously increased mining height in the super-large mining height workface,the inferior key stratum 1 of overburden is easy to enter the caving zone and periodically breakage as＂cantilever＂structure but not the＂voussoir beam＂structure.In this condition,the continuous length of periodic weighting is close to the roof distance of the support,which is significantly larger than that under the action of the key strata as＂voussoir beam＂structure.In some conditions,the periodically breakage of the inferior key stratum 2 would cause the early breakage of the first one,which would lead to the periodic changes of one big and the other small for the roof weighing step and ground pressure strength.As a result,the determination method of the support￠s working resistance is proposed with different key strata structural morphologies.Based on the method,the reasonable working resistance of the 7.0 m height support in working face 22303 of Bulianta Coal Mine should be 17 612 kN.And the existing rated working resistance of 16 800 kN is slightly small in some regions of the working face.

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