Elastic mechanics solution of water proof key layer in coal seam floor under high water pressure

Authors

WANG Yan, School of Earth and Environment, Anhui University of Science Technology, Huainan 232001, China
YAO Duoxi, School of Earth and Environment, Anhui University of Science Technology, Huainan 232001, China
LU Haifeng, School of Earth and Environment, Anhui University of Science Technology, Huainan 232001, China

Abstract

Aiming at the problem of water resisting capacity of the key layer in seam floor under the action of high pressure water, the key stratum was simplified as a fixed beam. The stress and displacement were calculated by the stress function method and the semi inverse method respectively. The results of two calculations were compared with the FLAC^3D results. The results show that the stress and displacement obtained by the stress function method are more appropriate than those calculated by the FLAC^3D method. It is suggested that for elastic mechanics analytic method of the fixed beam of the key layer the stress function method is the first method. The research results can provide theoretical support for the prediction and forecasting of water inrush from seam floor the bottom in a stope.

Keywords

water inrush in floor, clamped beam, stress function, semi inverse solution

DOI

10.3969/j.issn.1001-1986.2019.01.019

Recommended Citation

WANG Yan, YAO Duoxi, LU Haifeng, et al. (2019) "Elastic mechanics solution of water proof key layer in coal seam floor under high water pressure," Coal Geology & Exploration: Vol. 47: Iss. 1, Article 20.
DOI: 10.3969/j.issn.1001-1986.2019.01.019
Available at: https://cge.researchcommons.org/journal/vol47/iss1/20

Reference

[1] 杨天鸿,唐春安,谭志宏,等. 岩体破坏突水模型研究现状及突水预测预报研究发展趋势[J]. 岩石力学与工程学报,2007, 26(2):268-277. YANG Tianhong,TANG Chunan,TAN Zhihong,et al. State of the art of inrush models in rock mass failure and developing trend for prediction and forecast of groudwater inrush[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(2):268-277.

[2] 武强,崔芳鹏,赵苏启,等. 矿井水害类型划分及主要特征分析[J]. 煤炭学报,2013,38(4):561-565. WU Qiang,CUI Fangpeng,ZHAO Suqi,et al. Type classification and main characteristics of mine water disaters[J]. Journal of China Coal Society,2013,38(4):561-565.

[3] 王金安,魏现昊,陈绍杰. 承压水体上开采底板岩层破断及渗流特征[J]. 中国矿业大学学报,2012,41(4):536-542. WANG Jinan,WEI Xianhao,CHEN Shaojie. Fracture and seepage characteristics in the floor strata when mining above a confined aquifer[J]. Journal of China University of Mining and Technology,2012,41(4):536-542.

[4] 许进鹏,张福成,桂辉,等. 采动断层活化导水特征分析与实验研究[J]. 中国矿业大学学报,2012,41(3):415-419. XU Jinpeng,ZHANG Fucheng,GUI Hui,et al. Characteristic an experimental study of water conduction caused by fault activation due to mining[J]. Journal of China University of Mining and Technology,2012,41(3):415-419.

[5] LI Lianchong,YANG Tianhong,LIANG Zhengzhao,et al. Numerical investigation of groundwater outbursts near faults in underground coal mines[J]. International Journal of Coal Geology,2011,85(3/4):276-288.

[6] 李白英. 预防矿井底板突水的"下三带"理论及其发展与应用[J]. 山东矿业学院学报,1999,18(4):11-18. LI Baiying. The theory,development and application of the "lower three zones" in preventing water inrush from the floor of the mine[J]. Journal of Shandong Institute of Mining and Technology(Natural Science),1999,18(4):11-18.

[7] 张彦青. "下三带"理论对承压水上采煤底板突水的预测研究[J]. 山西煤炭,2014,34(4):50-52. ZHANG Yangqing. Prediction of Down Three-zone theory on floor water bursting in mining on confined aquifer[J]. Shanxi Coal,2014,34(4):50-52.

[8] 李加祥. 煤层底板"下三带"理论在底板突水研究中的应用[J]. 河北煤炭,1990(4):12-16. LI Jiaxiang. Application of the theory of"lower three zones"in coal seam floor to the study of water inrush from floor[J]. Hebei Coal,1990(4):12-16.

[9] QIAN M G,MIAO X X,LI L J. Mechanical behaviour of main floor for water in rush in longwall mining[J]. Journal of China University of Mining Technology,1995,5(1):9-16.

[10] 孙建,王连国,侯化强. 底板复合隔水关键层的隔水性能研究[J]. 中国矿业大学学报,2013,42(4):560-566. SUN Jian,WANG Lianguo,HOU Huaqiang. Resurch on water-isolating capacity of the compound water-resisting key strata in coal seam floor[J]. Journal of China University of Mining and Technology,2013,42(4):560-566.

[11] 柴敬,汪志力,刘文岗,等. 采场上覆关键层运移的模拟实验检测[J]. 煤炭学报,2015,40(1):35-41. CHAI Jing,WANG Zhili,LIU Wengang,et al. Monitoring movement laws of overlying key strata for coal mining in similar model[J]. Journal of China Coal Society,2015,40(1):35-41.

[12] 鞠金峰,许家林,朱卫兵. 浅埋特大采高综采工作面关键层"悬臂梁"结构运动对端面漏冒的影响[J]. 煤炭学报,2014,39(7):1197-1204. JU Jinfeng,XU Jianlin,ZHU Weibing. Influence of key strata cantilever structure motion on end-face fall in fully-mechanized face with supergreat mining height[J]. Journal of China Coal Society,2014,39(7):1197-1204.

[13] SHEN Y,QIN Y,WANG G G X,et al. Sedimentary control on the formation of a multi-superimposed gas system in the development of key layers in the sequence framework[J]. Marine & Petroleum Geology,2017,88:268-281.

[14] 钱鸣高,缪协兴,许家林,等. 岩层控制的关键层理论[M]. 徐州:中国矿业大学出版社,2003:9-20.

[15] 缪协兴,浦海,白海波,等. 隔水关键层原理及其在保水采煤中的应用研究[J]. 中国矿业大学学报,2008,37(1):1-4. MIAO Xiexing,PU Hai,BAI Haibo,et al. Principle of water-resisting key strata and its application in water-preserved mining[J]. Journal of China University of Mining and Technology,2008,37(1):1-4.

[16] 缪协兴,钱鸣高. 采动岩体的关键层理论研究新进展[J]. 中国矿业大学学报,2000,29(1):25-29. MIAO Xiexing,QIAN Minggao. New progress in theoretical research on key strata of mining rock mass[J]. Journal of China University of Mining and Technology,2000,29(1):25-29.

[17] 孙建,王连国,鲁海峰. 基于隔水关键层理论的倾斜煤层底板突水危险区域分析[J]. 采矿与安全工程学报,2017,34(4):655-662. SUN Jian,WANG Lianguo,LU Haifeng. The analysis of the water-inrush dangerous areas in the inclined coal seam floor based on the theory of water-resisting key strata[J]. Journal of Mining and Safety Engineering,2017,34(4):655-662.

[18] 冯梅梅,茅献彪,白海波,等. 承压水上开采煤层底板隔水层裂隙演化规律的试验研究[J]. 岩石力学与工程学报,2009, 28(2):336-341. FENG Meimei,MAO Xianbiao,BAI Haibo,et al. Experimental research on fracture evolution law of water-resisting strata in coal seam floor above aquifer[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(2):336-341.

[19] TIMOSHENKO S P,GOODIER J N. Theory of elasticity[M]. 3rd ed. New York:McGraw-Hill,1970.

[20] 戴瑛,嵇醒. 两端固定受均布载荷的短梁的平面应力解[J]. 同济大学学报(自然科学版),2008,36(7):890-893. DAI Ying,JI Xing. A plane stress solution of deep beam with fixed ends under uniform loading[J].Journal of Tongji University(Natural Science),2008,36(7):890-893.

[21] 陈玉骥. 单跨超静定梁在均布荷载作用下的弹性力学解[J]. 海南大学学报(自然科学版),2002,20(2):188-191. CHEN Yuji. The elastic mechanics solution of single span under static load under uniform load[J]. Natural science Journal of Hainan University,2002,20(2):188-191.

[22] 樊友景,高建华,李大望. 均布荷载作用下两端固支梁的弹性力学解析解[J]. 河南科学,2006,24(2):237-240. FAN Youjing,GAO Jianhua,LI Dawang. Analytical solution of elastic mechanics for two supported clamped beams under uniformly distributed load[J]. Henan Science, 2006, 24(2):237-240.