软弱地层隧道大变形整治技术
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摘要
蒙华(蒙西—华中)铁路阳城隧道一段落位于软弱地层中,其右侧是砂夹块石土,左侧为富水全风化砂岩,施工过程中产生了大变形。本文基于大变形段掌子面围岩的基本物理力学性能试验结果,从隧址区地质条件、围岩工程特性、隧道施工的影响等方面分析了大变形机理,采取反压回填、增设临时仰拱、增加扇形支撑、加密降水和注浆加固措施完成了大变形整治,效果良好。
Yangcheng Tunnel section of Menghua( Mengxi-Huazhong) Railway is located in weak strata.The right side of the tunnel is sand block rock soil,while the left side is water-rich fully weathered sandstone,which causes large deformation during construction.Based on the test results of the basic physical and mechanical properties of the surrounding rock of tunnel face in the large deformation section,the large deformation mechanism was analyzed from the geological conditions of the tunnel site,the engineering characteristics of the surrounding rock,the influence of tunnel construction and so on.The measures such as back pressure backfilling,setting temporary invert arch,adding fan-shaped support,improving dense precipitation and grouting reinforcement were adopted to complete the large deformation treatment,the effect of which is good.
Yangcheng Tunnel section of Menghua( Mengxi-Huazhong) Railway is located in weak strata.The right side of the tunnel is sand block rock soil,while the left side is water-rich fully weathered sandstone,which causes large deformation during construction.Based on the test results of the basic physical and mechanical properties of the surrounding rock of tunnel face in the large deformation section,the large deformation mechanism was analyzed from the geological conditions of the tunnel site,the engineering characteristics of the surrounding rock,the influence of tunnel construction and so on.The measures such as back pressure backfilling,setting temporary invert arch,adding fan-shaped support,improving dense precipitation and grouting reinforcement were adopted to complete the large deformation treatment,the effect of which is good.
引文
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[2]李磊,谭忠盛,郭小龙,等.高地应力陡倾互层千枚岩地层隧道大变形研究[J].岩石力学与工程学报,2017,36(7):1611-1622.
[3]李国良,刘志春,朱永全.兰渝铁路高地应力软岩隧道挤压大变形规律及分级标准研究[J].现代隧道技术,2015,52(1):62-68.
[4]徐国文,何川,代聪,等.复杂地质条件下软岩隧道大变形破坏机制及开挖方法研究[J].现代隧道技术,2017,54(5):146-154.
[5]吴广明,刘志春,吴晓辉.兰渝铁路两水隧道软岩大变形控制技术[J].铁道标准设计,2013,57(12):82-86.
[6]张彪,张志强,汪波,等.让压锚杆在大变形隧道支护应用中试验研究[J].岩土力学,2016,37(7):2047-2055.
[7]汪波,杨意,何川,等.破碎千枚岩隧道施工期位移安全控制基准研究[J].岩石力学与工程学报,2016,35(11):2287-2297.
[8]杨进京.炭质泥岩夹砂岩隧道大变形机理及控制措施研究[D].兰州:兰州交通大学,2015.
[9]高美奔,李天斌,孟陆波,等.隧道软岩大变形力学机制及防治措施综述[J].施工技术,2013,42(增2):247-251.
[10]于天赐.软岩隧道大变形控制技术研究[J].土木工程学报,2017,50(增2):112-117.
[11]李术才,徐飞,李利平,等.隧道工程大变形研究现状、问题与对策及新型支护体系应用介绍[J].岩石力学与工程学报,2016,35(7):1366-1376.