急斜放頂煤開采頂板卸載拱結構分析

邵小平; 石平五; 賀桂成

doi:10.13374/j.issn1001-053x.2007.05.001

急斜放頂煤開采頂板卸載拱結構分析

doi: 10.13374/j.issn1001-053x.2007.05.001

1. 西安科技大學能源科學與工程學院, 西安 710054;
2. 南華大學建筑工程與資源環境學院, 衡陽 421001

基金項目:

國家自然科學基金資助項目(No.50274058)

2005年高等學校博士點專項基金資助項目(No.20040704002)

詳細信息

作者簡介:
邵小平(1973-),男,博士研究生;石平五(1941-),男,教授,博士生導師

中圖分類號: TD31
計量
- 文章訪問數: 204
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- PDF下載量: 6
- 被引次數: 0
出版歷程
- 收稿日期: 2006-01-28
- 修回日期: 2006-06-01
- 網絡出版日期: 2021-08-16

Analysis on unloaded arch structure of roof in mining steep seams using horizontal section top-coal caving

1. College of Resource and Energy, Xi'an University of Science and Technology, Xi'an 710054, China;
2. College of Architectural and Environment Engineering, Nanhua University, Hengyang 421001, China

摘要

摘要: 運用彈性薄板理論對急斜煤層水平分段放頂煤開采基本頂巖層進行拉應力分析,得出了頂板破斷的判別準則.依據判別準則實例驗證了分段開采后暴露巖板所受荷載只是整個上覆巖層中的一部分,指出上覆層中存在卸載拱結構,正是結構體的存在承擔了大部分上覆巖層荷載,直接影響了開采過程的礦壓顯現.通過對卸載拱影響因素的研究,指出卸載拱是頂板巖層中的一種動態擴展結構,當原有的拱式平衡被打破,拱結構朝頂板側上移,并達到一種新的平衡態,因此其范圍是不斷擴展的一個"平衡-失穩-再平衡-再失穩"的動態擴展過程,也是造成工作面礦壓顯現的原因.
- 水平分段放頂煤 /
- 彈性薄板 /
- 卸載 /
- 拱結構 /
- 方差分析
Abstract: Surrounding rock structures of steep seams and gently inclined seams are different. Basic roof and immediate roof of horizontal section top coal caving were beside the working face in steep seams. A judgment criterion of roof destruction was attained by analyzing tension to basic roof. According to the judgment criterion, it was verified that only one part of overlying strata was loaded to exposed rock board. There is unloaded arch structure in overlying strata. The unloaded arch structure bears most weigh of overlying strata and effects later strata behavior of the working face. It is pointed out that the unloaded arch structure is a dynamic expansion structure. It will move towards roof as original balance of arch was broken and keeps a new balance. The scope of arch is a process constantly to expand from balance to instability.
- horizontal section top coal caving /
- elastic thin board /
- unload /
- arch structure /
- variance analysis