文献类型：期刊文献

中文题名：房式采空区下近距离煤层开采支架工作阻力研究

英文题名：Research on support resistance of contiguous coal seam mining under room-and-pillar gob

作者：许猛堂 徐佑林 金志远

第一作者：许猛堂

机构：[1]贵州理工学院矿业工程学院,贵州贵阳550003

第一机构：贵州理工学院矿业工程学院

年份：2020

卷号：48

期号：8

起止页码：63-69

中文期刊名：煤炭科学技术

外文期刊名：Coal Science and Technology

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家自然科学基金资助项目(51764010,51874109);安全生产重大事故防治关键技术科技资助项目(guizhou-0004-2017AQ);贵州省科学技术基金资助项目(黔科合基础[2020]1Y215)。

语种：中文

中文关键词：房式采空区;近距离煤层;破断步距;应力集中;支架工作阻力

外文关键词：room-and-pillar gob;contiguous coal seam;breaking step;stress concentration;working resistance of support

摘要：为研究房式采空区下近距离煤层开采支架合理支护阻力,基于石圪台煤矿实际地质条件,构建了房式采空区下关键层初次破断与周期性破断力学模型,得到了初次来压和周期来压步距表达式,并构建了对应的"支架-围岩"相互作用力学模型,获得了支架工作阻力的计算式。研究结果表明:房式采空区下煤层开采关键层破断步距主要特点有2个:①关键层初次破断及周期性破断步距与上覆留设煤柱应力集中程度密切相关;②破断步距大小受关键层前次破断位置影响较大。理论计算31201综采工作面关键层初次来压步距为40.1 m,前3次周期来压步距分别为20.4、18.9、20.8 m。与均布载荷条件下相比,房式采空区下支架支护阻力的主要影响因素有2个,即关键层受上覆岩层集中力的位置和关键层初次破断结构形态。理论计算获得该工作面初次来压和前3次周期来压合理工作阻力分别为17 372、11 722、15 252、15 206 kN。结合工程实例,验证了理论推导的合理性,研究成果为房式采空区下近距离煤层开采液压支架选型提供了指导。
In order to study the reasonable support resistance of contiguous coal seam mining under room-and-pillar gob,based on the actual geological conditions of Shigetai Coal Mine,the mechanical models of primary and periodic breakage of key layers under room-andpillar gob were constructed to obtain the initial and periodic weighting intervals,and the corresponding"support-rock"interaction mechanical models were constructed to calculate the working resistance of the support.The results of the study indicate that there are two main features of the key strata breaking step under room-and-pillar gob mining: ① The first breaking and periodic breaking step of the key layer are closely related to the stress concentration degree of the coal pillars left above;② The breaking step size is greatly affected by the location of the key layer’s previous break.The initial striking step of the key stratum of the No.31201 fully-mechanized coal mining face is 40.1 m by theoretical calculation,and the striking step of the first three cycles is 20.4 m,18.9 m,and 20.8 m.Compared with the uniform load condition,there are two main influencing factors for the determination of the support resistance under room-and-pillar gob mining: The position where the key layer is concentrated by the overlying rock layer;The structural form of the first break of the key layer.Theoretical calculations show that the reasonable working resistances during the first weighting and the first three periodic weighting are 17 372 k N,11722 k N,15 252 k N and 15 206 k N.The rationality of the theoretical derivation is verified by engineering example,and the research results provide guidance for the selection of hydraulic supports of contiguous coal seam mining under room-and-pillar gob.