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基于岩爆危险性评价的川藏铁路某深埋硬岩隧道线路方案比选研究

陈仕阔 李涵睿 周航 陈兴强 刘彤

陈仕阔, 李涵睿, 周航, 陈兴强, 刘彤. 基于岩爆危险性评价的川藏铁路某深埋硬岩隧道线路方案比选研究[J]. 水文地质工程地质, 2021, 48(5): 81-90. doi: 10.16030/j.cnki.issn.1000-3665.202103099
引用本文: 陈仕阔, 李涵睿, 周航, 陈兴强, 刘彤. 基于岩爆危险性评价的川藏铁路某深埋硬岩隧道线路方案比选研究[J]. 水文地质工程地质, 2021, 48(5): 81-90. doi: 10.16030/j.cnki.issn.1000-3665.202103099
CHEN Shikuo, LI Hanrui, ZHOU Hang, CHEN Xingqiang, LIU Tong. Route selection of deep-lying and hard rock tunnel in the Sichuan-Tibet Railway based on rock burst risk assessment[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 81-90. doi: 10.16030/j.cnki.issn.1000-3665.202103099
Citation: CHEN Shikuo, LI Hanrui, ZHOU Hang, CHEN Xingqiang, LIU Tong. Route selection of deep-lying and hard rock tunnel in the Sichuan-Tibet Railway based on rock burst risk assessment[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 81-90. doi: 10.16030/j.cnki.issn.1000-3665.202103099

基于岩爆危险性评价的川藏铁路某深埋硬岩隧道线路方案比选研究

doi: 10.16030/j.cnki.issn.1000-3665.202103099
基金项目: 国家自然科学基金项目(41672295);四川省科技计划项目(2019YFG0047)
详细信息
    作者简介:

    陈仕阔(1982-),男,博士,副教授,主要从事地质工程和岩土工程等相关方面的科研与教学工作。E-mail:shikuochen@swjtu.edu.cn

    通讯作者:

    周航(1995-),男,硕士,助理工程师,主要从事铁路隧道重大地质灾害危险性评价与防控研究。E-mail:zhouhangswjtu@163.com

  • 中图分类号: TU443

Route selection of deep-lying and hard rock tunnel in the Sichuan-Tibet Railway based on rock burst risk assessment

  • 摘要: 川藏铁路穿越区域地形起伏大,区域地质构造作用强烈,隧道建设中面临的高地应力问题异常复杂,特别是深埋硬岩隧道中的岩爆灾害问题,成为制约选线、设计乃至施工建设的难题。由于隧道工程地质条件复杂,如果岩爆评价指标针对性不强,往往会造成评价结果与实际偏差较大。通过综合分析影响岩爆的关键因素,选取岩石单轴抗压强度与洞壁最大主应力比、洞壁最大切向应力与岩石单轴抗压强度比、岩石强度脆性系数、岩石弹性能指数及岩体完整性系数建立了岩爆评价指标体系。根据熵权法确定各指标权重,基于理想点的基本理论及计算规则,构建了一种岩爆危险性评价模型。通过计算各里程段与理想点的距离,对新建川藏铁路某隧道的3种线路方案进行岩爆风险评估的综合比选。研究结果表明B线路总岩爆段落占比24.9%,其中不可控岩爆段落占比13.4%,比另外两条比选方案低4%左右,综合对比B线路为最优方案。该方法可为深埋硬岩隧道地质综合选线提供必要的科学依据和技术支撑。
  • 图  1  新建川藏铁路沿线构造纲要[24]

    Figure  1.  Geotectonic outline of the new Sichuan-Tibet Railway[24]

    图  2  新建川藏铁路某隧道典型地质剖面

    Figure  2.  Typical geological section of a tunnel on the new Sichuan-Tibet Railway

    图  3  线路方案

    Figure  3.  Route scheme

    图  4  线路埋深分布

    Figure  4.  Distribution of buried depth

    图  5  线路围岩级别占比

    Figure  5.  Percentage of surrounding rock grades

    图  6  岩石全过程应力-应变曲线

    Figure  6.  The complete stress-strain curve

    图  7  岩爆倾向性评价标准及结果分析图

    Figure  7.  Test results and evaluation criteria of rock burst proneness

    图  8  工程区最大水平主应力云图

    Figure  8.  Maximum horizontal principal stressof the engineering area

    图  9  实测钻孔地应力值与模拟值对比

    Figure  9.  Comparison of the measured borehole value and simulated value

    图  10  岩爆危险性评价结果

    Figure  10.  Rock burst risk assessment results

    表  1  岩爆与各评价指标的关系

    Table  1.   Relationship between rock burst and various evaluation indexes

    评价指标轻微中等强烈
    σc/σmax≥7[4, 7)[2, 4)<2
    σθ/σc<0.20[0.20, 0.30)[0.30, 0.55)≥0.55
    σc/σt≥40.0[26.7, 40.0)[14.5, 26.7)<14.5
    Kv<0.55[0.55, 0.65)[0.65, 0.75)≥0.75
    Wet<2.0[2.0, 3.5)[3.5, 5.0)≥5.0
    下载: 导出CSV

    表  2  岩石物理力学参数一览表

    Table  2.   Physical and mechanical parameters of rocks

    岩性单轴抗压强度
    σc/MPa
    抗拉强度
    σt /MPa
    静弹性
    模量E/GPa
    静泊松
    v
    密度ρ/
    (g·cm−3)
    横波波速
    vp/(m·s−1)
    纵波波速
    vs/(m·s−1)
    动弹性模量
    Ed/GPa
    动泊松
    vd
    二长花岗岩118.25.8330.120.212.693054.625233.8461.320.24
    123.76.3332.360.222.662643.395694.8354.720.25
    103.45.3428.790.212.763018.195450.1864.190.28
    花岗闪长岩145.66.9236.160.232.653123.324998.1160.980.18
    151.47.5735.780.252.683131.555163.6963.480.21
    137.57.3135.620.212.752643.395694.8352.270.36
    下载: 导出CSV

    表  3  实测钻孔地应力数据

    Table  3.   Measured borehole stress data

    钻孔
    编号
    埋深/m主应力值/MPa最大主应力方向
    SH Sh Sv
    CD-1#178~6226.25~17.555.32~13.354.66~16.20N42°—
    52°E
    下载: 导出CSV

    表  4  线路部分里程的应力资料

    Table  4.   Stress data of route partial mileage

    线路方案里程编号SH/MPaSh/MPaSv/MPa
    AA139.616.819.6
    A242.919.322.9
    A350.326.133.2
    A451.222.329.3
    BB133.714.323.7
    B235.612.120.6
    B347.923.131.9
    B443.519.726.5
    CC135.212.521.6
    C236.116.324.6
    C348.623.632.8
    C445.120.628.4
    下载: 导出CSV

    表  5  线路部分里程的岩爆分析资料

    Table  5.   Rock burst analysis data of route partial mileage

    线路方案里程编号σc /MPaσmax/MPaσθ/MPa
    AA1$\dfrac{ {103.4:118.2} }{ {114.1} }$39.647.4
    A242.959.5
    A3$\dfrac{ {137.5:151.4} }{ {144.8} }$50.386.2
    A451.277.4
    BB1$\dfrac{ {103.4:118.2} }{ {114.1} }$33.745.2
    B235.642.8
    B3$\dfrac{ {137.5:151.4} }{ {144.8} }$47.975.7
    B443.568.1
    CC1$\dfrac{ {103.4:118.2} }{ {114.1} }$35.249.6
    C236.165.2
    C3$\dfrac{ {137.5:151.4} }{ {144.8} }$48.685.5
    C445.178.1
      注:单轴抗压强度中,横线上为最小值∶最大值,横线下为平均值。
    下载: 导出CSV

    表  6  各评价指标值

    Table  6.   Each evaluation index values

    线路方案里程编号σc/σmaxσθ/σcσc/σtWetKv
    AA12.910.4119.740.623.60
    A22.690.5219.740.623.60
    A32.880.6018.350.814.30
    A42.830.5319.920.714.00
    BB13.420.3919.740.623.60
    B23.230.3719.740.623.60
    B33.020.5219.920.624.00
    B43.330.4718.350.814.30
    CC13.270.4319.740.623.60
    C23.190.5719.740.623.60
    C32.980.5918.350.814.30
    C43.210.5419.920.714.00
    下载: 导出CSV

    表  7  各评价指标权重系数

    Table  7.   Entropy weight of each evaluation index

    评价指标σc/σmaxσθ/σcσc/σtWetKv
    熵值ej0.9920.8370.9970.9310.985
    偏差度1−ej0.0080.1630.0030.0690.015
    权重系数w0.0320.6310.0130.2670.056
    下载: 导出CSV

    表  8  岩爆危险性评价结果示例

    Table  8.   Examples of rock burst risk assessment results

    线路方案里程
    编号
    岩性埋深/m围岩级别H=2(欧氏距离)岩爆判
    别结果
    轻微中等强烈
    AA1二长花岗岩783~809Ⅲ级2.7011.3120.4280.480中等
    A2二长花岗岩792~813Ⅲ级3.4782.1310.5160.386强烈
    A3花岗闪长岩1195~1215Ⅱ级4.1642.9690.7860.252强烈
    A4花岗闪长岩893~912Ⅲ级3.6572.3460.3540.217强烈
    BB1二长花岗岩780~801Ⅲ级2.5531.1550.4400.540中等
    B2二长花岗岩806~815Ⅲ级2.4050.9950.4590.551中等
    B3花岗闪长岩1176~1192Ⅲ级3.5442.1880.5190.404强烈
    B4花岗闪长岩973~995Ⅱ级3.2372.0830.5880.335强烈
    CC1二长花岗岩753~767Ⅲ级2.8351.4560.4270.487中等
    C2二长花岗岩780~796Ⅲ级3.8832.5540.6280.420强烈
    C3花岗闪长岩1183~1191Ⅱ级4.1252.9320.7750.261强烈
    C4花岗闪长岩936~965Ⅲ级3.6932.3850.3710.268强烈
    下载: 导出CSV
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    Standard for engineering classification of rock mass: GB/T 50218—2014[S]. Beijing: China Planning Press, 2014. (in Chinese)
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出版历程
  • 收稿日期:  2021-03-30
  • 修回日期:  2021-06-14
  • 网络出版日期:  2021-09-09
  • 刊出日期:  2021-09-10

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