深埋碳质板岩隧道采用不同开挖方法时围岩及初期支护变形特征
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摘要
大理至瑞丽铁路高黎贡山隧道为深埋碳质板岩隧道,利用MIDAS/GTS建立数值模型研究该隧道开挖过程中围岩及初期支护变形特征。结果表明:含仰拱全断面开挖在控制围岩变形和剪切破坏方面比不含仰拱全断面开挖更有优势,掌子面渗水导致实测的围岩变形量稍大于数值模拟结果;围岩压力和钢拱架应力出现急剧增长、增速变缓、趋于稳定3个阶段。急剧增长阶段围岩压力和钢拱架应力的最大值分别占整体最大值的70%～85%和60%～85%,围岩变形、围岩压力和钢拱架应力的最大值均出现在拱顶,较大值均出现在右拱腰和左拱脚,存在右上左下的偏压现象。
Gaoligongshan tunnel of Dali-Ruili railway is a deep buried carbonaceous slate tunnel,a numerical model to study the deformation characteristics of surrounding rock and primary support in tunnel excavation was established by using MIDAS/GTS. The results showthat full section excavation including inverted arch is more advantageous than excavation not including inverted arch in controlling deformation and shear failure of surrounding rock,the measured surrounding rock deformation caused by water seepage on the tunnel face is slightly larger than that of numerical simulation,surrounding rock pressure and steel arch stress showsuch three stages as sharp increasing,the growth rate slowing down and tending to be stable.The maximum values of surrounding rock pressure and steel arch stress are 70% ～ 85% and 60% ～ 85% of global maximum respectively in the stage of sharp increasing,the maximum values of surrounding rock deformation,surrounding rock pressure and steel arch stress appear at the vault,the larger values appear in the right arch waist and left arch foot,and there is phenomenon of upper right lower left bias.
Gaoligongshan tunnel of Dali-Ruili railway is a deep buried carbonaceous slate tunnel,a numerical model to study the deformation characteristics of surrounding rock and primary support in tunnel excavation was established by using MIDAS/GTS. The results showthat full section excavation including inverted arch is more advantageous than excavation not including inverted arch in controlling deformation and shear failure of surrounding rock,the measured surrounding rock deformation caused by water seepage on the tunnel face is slightly larger than that of numerical simulation,surrounding rock pressure and steel arch stress showsuch three stages as sharp increasing,the growth rate slowing down and tending to be stable.The maximum values of surrounding rock pressure and steel arch stress are 70% ～ 85% and 60% ～ 85% of global maximum respectively in the stage of sharp increasing,the maximum values of surrounding rock deformation,surrounding rock pressure and steel arch stress appear at the vault,the larger values appear in the right arch waist and left arch foot,and there is phenomenon of upper right lower left bias.
引文
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[2]邵珠山,张艳玲,王新宇.大跨软岩隧道二衬合理支护时机的分析与优化[J].地下空间与工程学报,2016,12(4):996-1001.
[3]戴永浩,陈卫忠,田洪铭.大梁隧道软岩大变形及其支护方案研究[J].岩石力学与工程学报,2015,34(增2):4149-4156.
[4]刘高,张帆宇,李新召,等.木寨岭隧道大变形特征及机理分析[J].岩石力学与工程学报,2005,24(增2):5521-5526.
[5]李鸿博,戴永浩,宋继红,等.峡口高地应力软岩隧道施工监测及支护对策研究[J].岩土力学,2011,32(增2):496-501.
[6]王建军.兰渝铁路三叠系板岩隧道变形机理与围岩分级预报探究[J].现代隧道技术,2013,50(2):79-83.
[7]王云龙,谭忠盛.木寨岭板岩隧道塌方的结构失稳分析及预防措施研究[J].岩土力学,2012,33(增2):263-268.
[8]刘阳,伍晓军,刘志强.关于碳质板岩隧道大变形机理及应对措施的探讨[J].现代隧道技术,2014,51(6):19-24.
[9]李志平,韩现民.关角隧道碳质板岩段洞室支护体系综合评价指标研究[J].隧道建设,2015,35(3):220-226.
[10]张咪,曾阳益,邓通海.深埋软岩隧道开挖及支护变形特征研究[J].水电能源科学,2017,35(1):123-127.
[11]孙欢欢.炭质板岩隧道围岩变形特性与支护参数研究[D].长沙:中南大学,2012.
[12]张波.木寨岭隧道板岩变形机理研究[J].铁道建筑,2014,54(5):57-59.