Voussoir beam model for lower strong roof strata movement in longwall mining - Case study

被引：26

作者：

Liu, Chuang ^{[1
,2
]}

Li, Huamin ^{[1
]}

Mitri, Hani ^{[2
,3
]}

Jiang, Dongjie ^{[1
,4
]}

Li, Huigui ^{[1
]}

Feng, Junfa ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Sch Energy Sci & Engn, Jiaozuo 454003, Peoples R China

[2] McGill Univ, Dept Min & Mat Engn, Montreal, PQ H3A 0E8, Canada

[3] Hong Kong Polytech Univ, Sch Civil Engn, Jiaozuo 454003, Peoples R China

[4] Henan Inst Engn, Dept Safety Sci & Engn, Zhengzhou 451191, Henan, Peoples R China

来源：

JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING | 2017年 / 9卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Immediate roof thickness; Voussoir beam; Cantilever beam; Shield pressure;

D O I：

10.1016/j.jrmge.2017.07.002

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The paper presents the influence of varying immediate roof thickness on the lower strong roof strata movement and failure pattern in longwall coal mining with large mining height. The investigation is based on 58 geological drill holes and hydraulic shield pressure measurements around the longwall Panel 42105 of the Buertai Mine in Inner Mongolia Autonomous Region, China. The longwall Panel 42105 is characterized by relatively soft immediate roof strata of varying thickness superposed by strong strata, herein defined as lower strong roof. A voussoir beam model is adopted to interpret the structural movement of the lower strong roof strata and shield pressure measurements. It is shown that when the immediate roof is relatively thick, the broken overlying lower strong roof tends to form a stable voussoir beam with previously broken layer, thus not exerting high pressure on the hydraulic shield and working face. When the immediate roof is relatively thin, the broken overlying lower strong roof tends to behave as a cantilever beam, thus exerting higher pressure on the hydraulic shield and working face. Comparison of model predictions with measured time-weighted average shield pressure (TWAP) shows good agreement. (C) 2017 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.

引用

页码：1171 / 1176

页数：6