黄土地层含水率增大对大跨度隧道围岩压力影响

doi:10.11779/CJGE2021S1017

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摘要以某黄土公路隧道为背景,通过室内常规三轴试验来获取原状Q₂黄土的物理力学参数,并基于数值分析方法探讨因地表水分入渗或地下水位抬升引起的洞周围岩压力的变化规律,并提出考虑含水率影响的修正围岩压力算法。结果表明:①随着地表水入渗深度或地下水位抬升高度的增大,围岩压力呈增大趋势,且最大围岩压力比ψ_max=1.1~3.5,最大收敛变形比ζ_max=1.1~1.3;②初始含水率越低,其最大围岩压力比和收敛变形比越大,因地表水分入渗或水位抬升引起的围压放大效应越明显;③隧道埋深越浅,围岩压力分布越不均匀,“猫耳朵”形状越明显,埋深越大围岩压力分布相对均匀;④引入围岩压力比,提出了半数值半经验的修正隧道围岩压力计算公式,可考虑因黄土地层含水率增大引起的围岩压力放大效应。

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关键词 ：黄土地层, 隧道, 围岩压力, 含水率, 分布模式

Abstract：Based on a highway tunnel in loess, the triaxial tests under different moisture contents of undisturbed Q₂ loess are conducted to obtain the physical and mechanical parameters, and the numerical method is used to analyze the variation laws of surrounding earth pressure (SEP) under the infiltration of surface water or rising of underground water level. The modified methods for SEP are put forward by considering the effects of moisture content. The results show that: (1) With the increase of rising height of underground water level and the infiltration depth, the SEP exhibits a trend of increase, and the largest SEP ratio ψ_max=1.1~3.5, the largest surrounding earth convergence deformation ratio ζ_max=1.1~1.3. (2) The lower the initial moisture content of the loess stratum, the greater the maximum SEP ratio and convergence deformation ratio, and the more obvious the SEP amplification effect caused by water infiltration or rising of water level. (3) The shallower the buried depth of tunnel is, the more uneven the SEP distribution is, the more obvious the shape of “cat's ear” is, and the more evenly the SEP distribution is. (4) By introducing the SEP ratio, a semi-numerical and semi-empirical formula for calculating the SEP of the tunnel is put forward, and the amplification effect of SEP caused by the increase of moisture content of loess can be considered.

Key words： loess stratum tunnel surrounding earth pressure moisture content distribution mode

收稿日期: 2021-12-15

ZTFLH:

TU43

基金资助:西安理工大学省部共建西北旱区生态水利国家重点试验室项目(2019KJCXTD-12);国家自然科学基金项目(51678484);陕西省自然科学基金项目(2019JLP-22)

作者简介: 朱才辉(1983— ),男,陕西商南人,博士,2012年博士毕业于西安理工大学岩土工程专业,现任副教授,主要从事黄土力学与工程等方面的教学与研究工作。E-mail:zhucaihui123@163.com。

引用本文:

朱才辉, 贺豪楠, 兰开江, 李玉波. 黄土地层含水率增大对大跨度隧道围岩压力影响[J]. 岩土工程学报, 2021, 43(S1): 93-98. ZHU Cai-hui HE Hao-nan, LAN Kai-jiang, LI Yu-bo. Influences of increase of moisture content on surrounding soil pressure of large-span tunnels in loess. Chinese J. Geot. Eng., 2021, 43(S1): 93-98.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE2021S1017 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2021/V43/IS1/93

[1] 邵生俊,杨春鸣,焦阳阳,等. 湿陷性黄土隧道的工程性质分析[J].岩土工程学报,2013,35(9):1580-1590. (SHAO Sheng-jun, YANG Chun-min, JIAO Yang-yang, et al. Engineering properties of collapsible loess tunnel[J]. Chinese Journal of Geotechnical Engineering, 2013,35(9):1580-1590. (in Chinese))
[2] 王成. 深埋黄土隧道初期支护破坏模式研究[J]. 铁道工程学报, 2018,10: 65-68. (WANG Cheng. Research on the Failure Modes of Initial Support for Deep-buried Tunnel in Loess[J]. Journal of railway engineering society, 2018,10: 65-68. (in Chinese))
[3] 来弘鹏, 杨晓华, 林永贵. 黄土公路隧道病害分析与处治措施建议[J]. 公路,2006,6: 197-202. (LAI Hong-peng, YANG Xiao-hua, LIN Yong-gui. Disease analysis for highway tunnel in loess and treatment countermeasures[J]. Highway, 2006,6: 197-202. (in Chinese))
[4] 王明年,郭军,罗禄森,等. 高速铁路大断面黄土隧道深浅埋分界深度研究[J]. 岩土力学,2010,31(4):1157-1162. (WANG Ming-nian, GUO Jun, LUO Lu-sen, et al. Study of critical buried depth of large cross-section loess tunnel for high speed railway[J]. Rock and Soil Mechanics, 2010,31(4):1157-1162. (in Chinese))
[5] 张玉伟,宋战平,翁效林,等. 大厚度黄土地层浸水湿陷对地铁隧道影响的模型试验研究[J]. 岩石力学与工程学报, 2019, 38(5): 1030-1040. (ZHANG Yu-wei, SONG Zhe-ping, WENG Xiao-lin, et al. Model test study on influence of the collapsibility of large thickness loess stratum on subway tunnels[J].Chinese Journal of Rock Mechanics and Engineering,2019,38(5):1030-1040.(in Chinese))
[6] 翁效林, 王俊, 王立新, 等. 黄土地层浸水湿陷对地铁隧道影响试验研究[J]. 岩土工程学报, 2016, 38(8): 1374-1380. (WENG Xiao-lin,WANG Jun,WANG Li-xin, et al. Experimental research on influence of loess collapsibility on subway tunnels[J].Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1374-1380. (in Chinese))
[7] 黄训洪. 黄土隧道地基纵向局部湿陷对结构的力学行为影响研究[D].成都:西南交通大学, 2017. (HUANG Xun-hong. Study on the Influence of Longitudinal Local Collapsibility on the Mechanical Behavior of Loess Tunnel Foundation[D]. Chengdu: Southwest Jiaotong University, 2017.(in Chinese))
[8] 田少敏. 黄土隧道环向局部湿陷的围岩力学特性研究[D]. 成都:西南交通大学,2017. (TIAN Shao-min. Study on the Mechanical Properties of Surrounding Rock in the Circumferential Collapse of Loess Tunnel[D]. Chengdu: Southwest Jiaotong University, 2017.(in Chinese))
[9] 李骏, 邵生俊, 李国良,等. 黄土隧道的湿陷变形规律及其对衬砌结构的作用[J]. 岩石力学与工程学报, 2018, 37(1):251-260. (LI Jun,SHAO Sheng-jun,LI Guo-liang, et al. Collapse deformation of loess tunnel and its effect[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(1):251-260.(in Chinese))
[10] 梁燕, 赵桂娟, 谢永利,等. 黄土增湿变形的数值模型[J].建筑科学与工程学报,2007(3):43-46. (LIANG Yan, ZHAO Gui-juan, XIE Yong-li, LI Tong-lu, et al. Numerical Model of Loess Moistening Deformation[J]. Journal of Architecture and Civil Engineering, 2007(3):43-46. (in Chinese))
[11] 陈福江. 黄土隧道围岩含水率变化对隧道形态影响的研究[D]. 成都:西南交通大学,2008. (CHEN Fu-jiang. Study on the Tunnel's Modality Impact on Changes of Surrounding Rock Water Content at Loess Tunnel[D]. Chengdu: Southwest Jiaotong University,2008.(in Chinese))
[12] 邓国华,邵生俊,胡伟.考虑Q₃黄土增湿特性的隧道围岩变形分析[J]. 地下空间与工程学报, 2007(8): 1455-1458. (DENG Guo-hua, SHAO Sheng-jun, HU Wei. Analysis on defomration of tunnel surrounding loess considering its moisteinng characterisitc[J]. Chinese Journal of Underground Space and Engineering, 2007(8): 1455-1458. (in Chinese))
[13] 田俊峰,叶万军,杨更社. 含水率及冻融循环对黄土隧道围岩变形规律影响研究[J]. 公路, 2015,4: 271-276. (TIAN Jun-feng, YE Wan-jun, YANG Geng-she. Impact of moisture content and freeze-thaw cycle on rock deformation law of loess tunnel in Yangqu region[J]. Highway, 2015,4: 271-276. (in Chinese)).
[14] 公路隧道设计规范:JTGD70—2004[S]. 2004. TJTGD70—2004. Code for Design of Road Tunnel: JTGD70—2004[S]. 2004.
[15] 谢家烋. 浅埋隧道的地层压力[J]. 土木工程学报, 1964(6): 58-70. (XIE Jia-xiu. Earth pressure on shallow burial tunnel[J].China Civil Engineering Journal, 1964(6):58-70. (in Chinese))
[16] 王春浩. 超大断面黄土公路隧道围岩压力计算方法分析[J]. 现代隧道技术,2015,52(3):175-181. (WANG Chun-hao. Calculation Method for surrounding rock pressure of a loess highway tunnel with an extra-large section[J]. Modern Tunnelling Technology, 2015,52(3):175-181. (in Chinese))
[17] 杨建民,喻渝,谭忠盛,等. 大断面深浅埋黄土隧道围岩压力试验研究[J]. 铁道工程学报, 2009,2: 76-79. (YANG Jian-min, YU Yu, TAN Zhong-sheng, et al. Experimental research on the surrounding rock pressure of large sectional loess tunnel under deep and shallow submersion[J]. Journal of Railway Engineering Society, 2009,2: 76-79. (in Chinese))
[18] 王明年,郭军,罗禄森,等.高速铁路大断面深埋黄土隧道围岩压力计算方法[J].中国铁道科学,2009,30(5):54-58.(WANG Ming-nain, GUO Jun, LUO Lu-sen, et al. Calculation method for the surrounding rock pressure of deep buried large sectional loess tunnel of high speed railway[J]. China Railway Science, 2009,30(5): 54-58. (in Chinese))
[19] 于丽,吕城,段儒禹,等. 浅埋黄土隧道围岩压力计算方法[J]. 中国铁道科学,2019,40(4): 69-76. (YU Li, LÜ Cheng, DUAN Ru-yu, et al. Calculation method for surrounding rock pressure of shallow buried loess tunnel[J]. China railway science, 2019,40(4): 69-76.(in Chinese))