采空区对铁路隧道工程结构影响分析
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摘要
随着我国高速铁路建设的发展,越来越多的新建铁路工程位于矿产地下采空区附近,矿区开采后形成的采空区对铁路隧道工程安全性影响已日益成为亟需解决的工程问题。针对采空区引起地表塌陷危及隧道安全的问题,结合张吉怀铁路隧道工程情况,通过理论分析类比法,并采用Flac3D有限元软件进行数值计算,综合分析了杜夜锰矿地下采空区引起的地面变形影响范围以及铁路隧道变形情况。结果表明,杜夜锰矿开采后的采空区引起的围岩变形主要集中在矿体上方以矿体底部按岩石移动角作斜线包含的区域,区域外围岩变形迅速变小;采空后引起张吉怀铁路隧道变形影响距离保守估算取221m;杜夜锰矿采空区引起的隧道变形在允许范围内。
With the development of China's high-speed railway construction,more and more high-speed railway projects are aligned over areas with unfavorable geological conditions,such as,abandoned mining caverns.The stability of the railroad over mining caverns becomes increasingly more important and need to be addressed.This paper presents a case history of the ground subsidence and cavern collapse evaluation for a railway tunnel near the abandoned mining caverns in Zhang Jihuai High-speed Railway Project.Based on the analogy analysis,the ground subsidence area of an abandoned Du Ye manganese ore mining caverns and its influence zone as well as the tunnel deformation are numerically simulated by the FLAC 3 Dfinite element software.The results indicate that,the deformations of the abandoned mining caverns were concentrated in the upper crown area and area along the bedrock dip direction;areas outside the deformation concentration has little deflections.The influence distance for the abandoned mining cavern on the railway tunnel is conservatively taken as 221 meters and the deformation of the tunnel induced by the mining caverns are within the allowable limits.
With the development of China's high-speed railway construction,more and more high-speed railway projects are aligned over areas with unfavorable geological conditions,such as,abandoned mining caverns.The stability of the railroad over mining caverns becomes increasingly more important and need to be addressed.This paper presents a case history of the ground subsidence and cavern collapse evaluation for a railway tunnel near the abandoned mining caverns in Zhang Jihuai High-speed Railway Project.Based on the analogy analysis,the ground subsidence area of an abandoned Du Ye manganese ore mining caverns and its influence zone as well as the tunnel deformation are numerically simulated by the FLAC 3 Dfinite element software.The results indicate that,the deformations of the abandoned mining caverns were concentrated in the upper crown area and area along the bedrock dip direction;areas outside the deformation concentration has little deflections.The influence distance for the abandoned mining cavern on the railway tunnel is conservatively taken as 221 meters and the deformation of the tunnel induced by the mining caverns are within the allowable limits.
引文
[1]中华人民共和国国务院.铁路安全管理条例[Z].中华人民共和国国务院令第639号,2014.
[2] P.R.Sheorey,J.P.Loui,K.B.Singh,S.K.Singh.Ground subsidence observations and a modified influence function method for complete subsidence prediction[J].International Journal of Rock Mechanics and Mining Sciences,2000,37:801-818.
[3] Ramesh P.Singh,Ram N.Yadav.Prediction of subsidence due to coal mining in Raniganj coalfield,West Bengal,India[J].Engineering Geology,1995,39:103-111.
[4] Tomaz Ambrozic,Goran Turk.Prediction of subsidence due to underground mining by artificial neural networks[J].Computers&Geosciences,2003,29:627-637.
[5]胡丰,李云安,刘海鳌,等.采矿顶板最小安全厚度及地面沉陷变形研究[J].金属矿山,2013(8):117-123.
[6]杜国栋,李晓,韩现民,等.充填采矿法引起的地表变形数值模拟研究[J].金属矿山,2008(1):39-43.
[7]朱晓峻.带状充填开采岩层移动机理研究[D].中国矿业大学,2016.
[8]白义如.某铁矿充填法采矿引起的地表变形的FLAC分析[J].三峡大学学报(自然科学版),2013,35(1):62-65.
[9]张广伟.软弱覆岩地表沉陷机理研究及应用[D].煤炭科学研究总院,2016.
[10]付华,陈从新,夏开宗,等.地下采矿引起地表滑移变形分析[J].岩石力学与工程学报,2016,35(增2):3991-4000.
[11]《工程地质手册》编委会.工程地质手册(第五版)[M].北京:中国建筑工业出版社,2018.
[12]铁道部工务局.铁路工务技术手册-路基(修订版)[M].北京:中国铁道出版社,1995.
[13]中华人民共和国住房和城乡建设部.有色金属采矿设计规范(GB50771-2012)[S].北京:中国计划出版社,2012.
[14]中华人民共和国铁道部.铁路线路修理规则[Z].中华人民共和国铁道部铁运[2006]146号文件,2006.
[2] P.R.Sheorey,J.P.Loui,K.B.Singh,S.K.Singh.Ground subsidence observations and a modified influence function method for complete subsidence prediction[J].International Journal of Rock Mechanics and Mining Sciences,2000,37:801-818.
[3] Ramesh P.Singh,Ram N.Yadav.Prediction of subsidence due to coal mining in Raniganj coalfield,West Bengal,India[J].Engineering Geology,1995,39:103-111.
[4] Tomaz Ambrozic,Goran Turk.Prediction of subsidence due to underground mining by artificial neural networks[J].Computers&Geosciences,2003,29:627-637.
[5]胡丰,李云安,刘海鳌,等.采矿顶板最小安全厚度及地面沉陷变形研究[J].金属矿山,2013(8):117-123.
[6]杜国栋,李晓,韩现民,等.充填采矿法引起的地表变形数值模拟研究[J].金属矿山,2008(1):39-43.
[7]朱晓峻.带状充填开采岩层移动机理研究[D].中国矿业大学,2016.
[8]白义如.某铁矿充填法采矿引起的地表变形的FLAC分析[J].三峡大学学报(自然科学版),2013,35(1):62-65.
[9]张广伟.软弱覆岩地表沉陷机理研究及应用[D].煤炭科学研究总院,2016.
[10]付华,陈从新,夏开宗,等.地下采矿引起地表滑移变形分析[J].岩石力学与工程学报,2016,35(增2):3991-4000.
[11]《工程地质手册》编委会.工程地质手册(第五版)[M].北京:中国建筑工业出版社,2018.
[12]铁道部工务局.铁路工务技术手册-路基(修订版)[M].北京:中国铁道出版社,1995.
[13]中华人民共和国住房和城乡建设部.有色金属采矿设计规范(GB50771-2012)[S].北京:中国计划出版社,2012.
[14]中华人民共和国铁道部.铁路线路修理规则[Z].中华人民共和国铁道部铁运[2006]146号文件,2006.