摘要
为分析我国西部煤矿深埋弱黏结顶板中厚偏薄煤层的矿压显现特征及覆岩载荷传递机理,基于力学测试、XRD衍射试验及电镜扫描等研究方法,查明色连二矿2-2中煤层顶板主要砂岩层强度低、黏结力弱、抗变形能力差。现场开采实践表明:工作面开采后顶板覆岩破坏充分并及时充填采空区,致使初次来压和周期来压呈现出静压大,动压小、动载系数小等显现特征。据此,建立了压力拱力学模型,得到了压力拱跨度和拱高之间的关系式,计算出该拱高条件下支架的支护阻力,并通过数值模拟和现场实践得到了很好的验证。
This study focuses on the mining pressure behavior characteristics and overlying strata load transfer mechanism of coal seam in deep-buried weak-caking roof of a coalmine in West China. Through using the mechanical test, XRD diffraction analysis and scanning electron microscope(SEM), it is identified that the 2-2 middle coal seam roof of Shelian No.2 coalmine has following characteristics: low-strength sandstone layer, weak adhesion and poor anti-deformation ability. Field mining practice shows that the roof covering rock failure is complete and fill the goaf in time. This results in large static pressure, small dynamic pressure and small dynamic load coefficient regarding the mining pressure accordingly, the stress arch mechanics model is established. The relationship between stress arch span and arch height is obtained. Finally, the support resistance corresponding to the specific arch height is computed. Above calculation results has been well verified by numerical simulation and field practice.
作者
付宝杰
方恩才
涂敏
邓润义
FU Baojie;FANG Encai;TU Min;DENG Runyi(Shool of Energy and Security,Key Laboratory of Safety and High-Efficiency Coal Mining Ministry of Education, Anhui University of Science and Technology,Huainan,Anhui 232001,China;State Key Laboratory for GeoMechanics and Deep Underground Engineering,China University of Mining & Technology,Xuzhou,Jiangsu 221116,China;Huai Mine West Mine Investment Management Co Ltd,Ordos,Inner Mongolia 017000,China;Selian No.2 Mine,Ordos City Zhongbei Coal Chemical Industry Co Ltd,Ordos,Inner Mongolia 017000,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第1期24-29,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51674007
U1261201
51574007)
中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1509)
关键词
深埋
弱黏结
矿压显现
载荷传递
deep buried
weak caking
strata behavior
load transfer
