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浅埋煤层地表厚砂土层“拱梁”结构模型研究
引用本文:黄庆享,张沛,董爱菊.浅埋煤层地表厚砂土层“拱梁”结构模型研究[J].岩土力学,2009,30(9):2722-2726.
作者姓名:黄庆享  张沛  董爱菊
作者单位:1. 西安科技大学,能源学院,西安,710054
2. 西安文理学院,数学系,西安,710065
基金项目:国家自然科学基金项目,教育部"新世纪优秀人才支持计划"资助项目,教育部留学回国人员科研启动基金资助项目 
摘    要:西部地区拥有储量最大的浅埋煤田,煤层顶板主要特点是基岩薄,地表为厚砂土层。浅埋煤层采动后,上覆岩层垮落运动将直接波及地表厚砂土层,引起采场强烈来压及地表塌陷等灾害。通过物理模拟试验,揭示了厚砂土层贯通地表裂缝的形成和发展规律,发现地表厚砂土层初次垮落的“拱梁”和周期垮落的“弧形岩柱”结构。通过建立厚砂土层“拱梁”结构数学模型,得出了“拱梁”内的应力分量,并给出了厚砂土层破裂的判据和出现拉裂缝的位置,为确定周期性“弧形岩柱”的有关参数提供了依据,为工作面顶板压力控制和地表塌陷的分析提供了基础。

关 键 词:浅埋煤层  厚砂土层  “拱梁”  数学模型
收稿时间:2007-01-27

Mathematical model of “arch beam” of thick sandy soil layer movement in shallow seam
HUANG Qing-xiang,ZHANG Pei,DONG Ai-ju.Mathematical model of “arch beam” of thick sandy soil layer movement in shallow seam[J].Rock and Soil Mechanics,2009,30(9):2722-2726.
Authors:HUANG Qing-xiang  ZHANG Pei  DONG Ai-ju
Affiliation:1. School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; 2. Department of mathematics, Xi’an University of Arts and Science, Xi’an 710065, China
Abstract:The largest shallow coal field in the world is in west China. The coal seams have thin roof and thick sandy overburden. The failure of thick sandy soil layer spreads to the ground surface in shallow seam mining, which will cause heavy disasters, such as dynamic ground pressure in coal faces and ground surface subsidence. Through physical simulation model tests, the development of fractures in sandy soil layer and on the ground surface is observed to be temporary structure of “arch beam” and periodic “arch rock pillar”structure. The “arch beam” mathematical model is set up; and the stress distribution in the “arch beam” is presented. Furthermore, the criterion of thick sandy soil layer failure is set up; and the position of periodic tension fracture is determined. This work provides basis for analyzing roof pressure control and surface subsidence.
Keywords:shallow seam  thick sandy soil layer  arch beam  mathematical model
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