大采高沿空留巷顶板安全控制及跨高比优化分析  

Optimization analysis of span-depth ratio for roof safety control in gob-side entry retaining under large mining height

作　　者：韩昌良[1] 张农[1,2] 钱德雨[1] 薛博[1] 

机构地区：[1]中国矿业大学矿业工程学院,深部煤炭资源开采教育部重点实验室,江苏徐州221116 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《采矿与安全工程学报》2013年第3期348-354,共7页Journal of Mining & Safety Engineering

基　　金：高等学校博士学科点专项科研基金项目(20110095110013);江苏省普通高校研究生科研创新计划(CX10B_147Z);煤炭资源与安全开采国家重点实验室自主研究课题(SKLCRSM09X03)

摘　　要：考虑采动应力场、岩体承载性能和支护结构强度等因素,分析沿空留巷跨高比对围岩变形的影响,采用数值计算方法对比分析9种不同的跨高比留巷方案,结果表明优化留巷断面形态可充分提高留巷围岩的稳定性和抗变形能力。当巷道高度确定时,随着跨度的降低留巷围岩塑性区分布范围及变形量都不断减小;当巷道高度超过3 m时,围岩变形对跨度降低的变化更为敏感,且跨高比低于1.3时效果明显。在此基础上提出了大采高留巷最优跨高比的确定方法和留巷围岩控制思想,在4.2 m大采高工作面,留巷高度3.8 m、跨高比取0.79,工程实践取得成功。Considering such factors as mining pressure field, rock bearing capacity and support struc- ture strength, the influence of span-height ratio for gob-side entry retaining on surrounding rock defor- mation was analyzed. Numerical simulation models were established for comparative analysis of nine schemes for gob-side entry retaining with different span-height ratio under large mining height, and the results showed that optimized section configuration can substantially improve the stability of and non-deformability of the surrounding rock structure. Plastic range and surrounding rock deformation both decrease with the reduction of roadway span when the roadway height has been determined. The surrounding rock deformation is more sensitive to the reduction of span when the roadway height ex- ceeds 3 m, and the effect of optimization is more evident while the span-height ratio is less than 1.3. On this basis, the determination method and technology thoughts are proposed for optimal span-height ratio of gob-side entry retaining under large mining height, which has been successfully applied to the field test in 4.2 m large mining height face with the roadway height of 3.8 m and span-depth ratio at 0.79.

关 键 词：沿空留巷 巷道支护 围岩变形 跨高比 

分 类 号：TD322[矿业工程—矿井建设]