切顶成巷采空区冒落矸石碎胀系数及侧向压力测定研究

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英文篇名：Determination about Bulk Increase Coefficient and Lateral Pressure of Caving Gangue in Gob-side Entry Retaining Formed by Roof Cutting 作者：马新根 ; 何满潮 ; 张良 ; 孟琦 ; 张飞 ; 张家宾 英文作者：MA Xin-gen;HE Man-chao;ZHANG Liang;MENG Qi;ZHANG Fei;ZHANG Jia-bin;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology (Beijing);School of Mechanics and Civil Engineering,China University of Mining and Technology (Beijing);Tashan Coal Company,Datong Coal Mine Group; 关键词：切顶成巷 ; 采空区 ; 冒落矸石 ; 碎胀系数 ; 侧向压力 ; 复合顶板 英文关键词：gob-side entry retaining formed by roof cutting;;goaf;;caving gangue;;bulk increase coefficient;;lateral pressure;;compound roof 中文刊名：MKSJ 英文刊名：Coal Engineering 机构：中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;中国矿业大学(北京)力学与建筑工程学院;同煤大唐塔山煤矿有限公司; 出版日期：2019-02-20 出版单位：煤炭工程 年：2019 期：v.51;No.494 语种：中文; 页：MKSJ201902010 页数：5 CN：02 ISSN：11-4658/TD 分类号：47-51

摘要

为对切顶留巷条件下的顶板碎胀系数测定方法进行优化,并进一步探究碎胀系数的演化规律,在对现有切顶设计中顶板碎胀系数的取值方法进行总结的基础上,以塔山煤矿8304工作面复合顶板为例,通过地质详查、自然观测、标记观测以及层厚加权计算等多种方法的相互配合,对其顶板碎胀系数进行测定,同时对碎石帮侧向压力实施监测。结果表明,该顶板碎胀系数约为1. 40,顶板中泥岩较之细砂岩,垮落块度较小,初始碎胀系数及残余碎胀系数较大,碎胀系数稳定区滞后架后距离较长,且发现成巷进入稳定区后,碎石帮侧向压力会出现下降,而矸石碎胀系数始终处于稳定状态,没有出现明显回弹上升现象。
        In order to optimize the determination method of the roof bulk increase coefficient under the condition of gob-side entry retaining formed by roof cutting and further explore its evolution law,the present calculating methods are summarized at first. Then based on the compound roof of 8304 working face in Tashan Coal Mine,through detailed geological examination,natural observation,marker observation and layer thickness calculation,getting the bulk increase coefficient of roof is about 1.40. And the field measurement shows that the lumpiness of the mudstone is smaller than the fine sandstones,but the bulk increase coefficient is bigger and the length of the coefficient stability zone is longer. Besides,combined with the monitoring of gangue wall maintaining pressure,what can be seen is the lateral pressure of gangue wall decreases when the retaining entry is stable,but the bulking coefficient of gangue has no obvious rebound rise.

引文

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