固体充填采煤沿空留巷顶板下沉影响因素研究  

Study on Influence Factors of Roof Subsidence in Gob-side Entry Retaining with Solid Backfill Mining

作　　者：陈勇[1,2] 李百宜[1] 郝德永[1] 齐文跃[1] 兰立信 

机构地区：[1]中国矿业大学深部煤炭资源开采教育部重点实验室矿业工程学院,江苏徐州市221116 [2]兖州煤业股份有限公司济宁三号煤矿,山东济宁市272169

出　　处：《矿业研究与开发》2015年第9期14-19,共6页Mining Research and Development

基　　金："十二五"国家科技支撑计划项目(2012BAB13B03)

摘　　要：为研究不同因素对固体充填采煤沿空留巷顶板下沉的影响,分析了固体充填采煤沿空留巷的覆岩移动特征,基于Winkler地基假设,建立沿空留巷顶板力学模型。以济三煤矿63下04(南)-2运矸巷为工程背景,分析探讨巷道宽度、巷旁支护阻力、巷旁支护体宽度、采空区充实率与巷道上覆顶板下沉的关系,结果表明:顶板下沉量随巷道宽度的增加而增加、随巷旁支护阻力增加而减小、随巷旁支护体宽度增加而降低、随充实率的增加而降低。现场实践中,巷道宽度4.2m,巷旁支护体宽度4.5m,采用锚带网联合支护对巷道进行加固,采用垒砌矸石墙加混合充填体的综合支护方式进行沿空留巷的巷旁支护,实测得工作面后方留巷巷道两帮最大移近量230mm,顶板最大下沉量300mm。In order to study the influence of different factors on roof subsidence in gob-side entry retaining with solid backfill mining, the features of strata movement were ana- lyzed. Based on the Winkler Hypothesis foundation, the roof mechanical models of gob-side entry retaining were established. Taking the 63down04（south） 2 gangue lane in Jining No. 3 coal mine as a project background, the relationships between roof subsidence with drift width, roadside support resistance, roadside supporting body width and goal filling ratio were analyzed and discussed. The results showed that the roof subsidence increased with the enlargement of drift width, and decreased with the improvement of other three factors. In practice, the combined support with bolting, steel band and wire mesh was used to reinforce the drift with width of 4.2 m, and the comprehensive support, combining waste wall and mixed filling body, was adopt to support lane side with support body width of 4.5 m in gob-side entry re taining. The maximum displacement in two sides of entry retaining after working face was measured as 230 mm, and the maximum roof subsidence as 300 mm.

关 键 词：固体充填采煤 沿空留巷 顶板下沉 影响因素 

分 类 号：TD823.7[矿业工程—煤矿开采]