论文部分内容阅读
以镇城底矿为工程背景,通过理论分析、相似模拟、数值模拟和现场实测,研究了非充分采动采空区和煤岩柱(体)耦合作用机制。得出如下结论:(1)不同的工作面布置产生不同的工作面构型、采空区形态和煤岩柱(体)形态,进而造成不同的耦合作用结果,采空区响应对实体煤岩柱(体)的应力及岩体破坏影响很大,数值模拟不可忽略采空区作用;(2)推导出煤柱极限平衡区宽度表达式,分层开采单一分层时采高降低、大采高和错层位开采存在斜坡均导致煤柱极限平衡区宽度下降;(3)垮落角对采空区和煤岩柱(体)耦合作用有重要影响,通过相似模拟确定了垮落角并用于数值模拟,得出非充分采动条件下工作面宽度L、最上部关键层跨度L_1与垮落角θ之间的关系式;(4)数值模拟显示非充分采动采空区承载增加,则支承压力相应降低,反之亦然,验证了非充分采动采空区和煤岩柱(体)的耦合作用,数值模拟若忽略采空区承载作用会造成支承压力偏大,应力集中区高度偏大,且位置降低,岩体破坏范围偏大;(5)根据研究结果,现场将进风巷布置于采空区边缘下方,形成巷顶沿空巷道,该巷道处于整个回采系统应力最低区;而回风巷沿顶板布置,工作面两侧顺槽矿压问题均得到良好控制。
Based on the background of Zhenchengdi Mine, the mechanism of coupling between goaf and non-fully-mechanized goaf was studied through theoretical analysis, simulative simulation, numerical simulation and on-site measurement. The conclusions are as follows: (1) Different face layouts produce different face configuration, the shape of goaf and the shape of coal pillar (body), resulting in different coupling effects. The stress of the column and the rock mass are greatly affected, and the numerical simulation can not ignore the effect of the goaf. (2) The width expression of the limit equilibrium zone of the coal pillar is derived. When the single layer is stratified mining, the mining height is reduced, (3) The collapse angle has an important influence on the coupling between the goaf and the coal pillar (body), and the collapse angle is determined by the similarity simulation In the numerical simulation, the relationship between the width L of the working face and the span L 1 of the uppermost critical layer under the condition of insufficient mining is obtained. (4) The numerical simulation shows that the bearing capacity of the fully- The supporting pressure is correspondingly reduced and vice versa, which verifies the coupling between the coal mining pillar and the non-fully-mechanized goaf. If the numerical simulation ignores the bearing effect of the goaf, the supporting pressure will be larger and the stress concentration area height Large, and lower location, rock mass destruction range is too large; (5) According to research As a result, the inlet airway was arranged on the site below the edge of the gob area to form a roadway with gob-side entry. The roadway was in the lowest stress area of the entire mining system. The air return lanes were arranged along the roof, Get well controlled.