文献类型：期刊文献

中文题名：浅埋近距离多煤层采空区下厚关键层破断特征及支架工作阻力确定

英文题名：Fracture characteristics of thick key stratum and calculation of shield work load under multiple coal seam mining gobs with shallow depth

作者：冯军发 周英 张开智 徐佑林 李回贵

第一作者：冯军发

机构：[1]贵州理工学院矿业工程学院;[2]河南理工大学能源科学与工程学院

第一机构：贵州理工学院矿业工程学院

年份：2018

卷号：35

期号：2

起止页码：332-338

中文期刊名：采矿与安全工程学报

外文期刊名：Journal of Mining & Safety Engineering

收录：CSTPCD;;EI(收录号：20183005600053);Scopus(收录号：2-s2.0-85050283922);北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金煤炭联合基金重点项目(U1261207);国家自然科学基金项目(51564004);贵州省教育厅创新群体重大研究项目(黔教合KY字[2016]042)

语种：中文

中文关键词：浅埋;厚关键层;砌体梁;悬臂梁;台阶岩梁;支架工作阻力

外文关键词：shallow seam; thick and hard roof; masonry beam; cantilever beam; step voussoir beam;shield working resistance

摘要：针对浅埋近距离多煤层中间厚关键层破断呈现的大小周期来压现象,以神东补连塔煤矿上煤层采空区下大采高工作面为背景,采用现场实测与理论分析等方法对多煤层工作面厚关键层破断特征及矿压显现规律进行了研究。结果表明:多煤层中间厚关键层在矿山压力和自身弱面结构影响下将以分层方式垮落;根据关键层判别方法、钻孔岩芯和工作面矿压显现综合判断,垮落位置位于该岩层中部,上位厚关键层顶板形成"砌体梁"结构,下位厚关键层顶板形成"悬臂梁"结构;"砌体梁"结构对工作面矿压影响减弱,"悬臂梁"结构成为支架作用力的主要力源;正常回采时影响支架稳定的最危险状态是悬臂梁与砌体梁组合同时破断,对工作面顶板管理带来一定的困难;厚关键层在特殊情况下会产生整层破断形成"台阶岩梁"结构,应提前采取应对措施。
In view of the size of the weighting cycle phenomenon under the condition of middle thick key stratum broken in multiple coal seam mining gobs with shallow depth, this paper takes a panel of the Bulianta mine with a large mining height in Shendong coal field as the research background. The ground pressure behavior and roof movement characteristics of the thick key strata are analyzed using methods including the in-situ observation, the theoretical analysis, at al. The results show that the thick and hard rock stratum in the middle layer of the multi seam caves in a hierarchical manner under the in- fluence of the ground pressure and rock weak plane. The thick key strata collapse position is in the mid- dle position according to a comprehensive judgment of combing the identifying key stratum method, drilling core and ground pressure. The upper thick key strata is formed by the ＂masonry beam＂ structure and the lower thick hard roof is formed by the ＂cantilever beam＂ structure. The upper ＂masonry beam＂structure weakens the ground pressure influence and the cantilever beam structure became the main source of hydraulic support. The most dangerous state of the support is the combination broken of the cantilever beam and the masonry beam during coal mining, which brings some difficulties for roof con- trol. Specially, thick key strata are broken in a holistic manner, and form a step voussoir beam structure. Response measures should be taken in advance_