|本期目录/Table of Contents|

[1]张立鑫,陈丽俊,陈建勋,等.单斜构造软硬互层围岩隧道变形特征及控制对策[J].建筑科学与工程学报,2021,38(06):186-196.[doi:10.19815/j.jace.2021.04102]
　ZHANG Li-xin,CHEN Li-jun,CHEN Jian-xun,et al.Deformation Characteristics and Treatment Measures of Tunnels in Soft and Hard Interbedded Surrounding Rock with Tilted Stratum[J].Journal of Architecture and Civil Engineering,2021,38(06):186-196.[doi:10.19815/j.jace.2021.04102]
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单斜构造软硬互层围岩隧道变形特征及控制对策(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
38卷
期数:
2021年06期
页码:
186-196
栏目:
软土隧道施工与变形控制
出版日期:
2021-11-05

文章信息/Info

Title:
Deformation Characteristics and Treatment Measures of Tunnels in Soft and Hard Interbedded Surrounding Rock with Tilted Stratum
文章编号:
1673-2049(2021)06-0186-11
作者:
张立鑫1,陈丽俊1,陈建勋1,王智佼2,王治才2,刘伟伟1
(1. 长安大学 公路学院,陕西 西安 710064; 2. 甘肃长达路业有限责任公司,甘肃 兰州 730050)
Author(s):
ZHANG Li-xin1, CHEN Li-jun1, CHEN Jian-xun1, WANG Zhi-jiao2, WANG Zhi-cai2, LIU Wei-wei1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Gansu Changda Highway Co., Ltd., Lanzhou 730050, Gansu, China)
关键词:
隧道工程;  变形特征;  数值模拟;  初期支护;  岩层倾角;  控制措施
Keywords:
tunnel engineering;  deformation characteristic;  numerical simulation;  primary support;  dip inclination of rock stratum;  control measure
分类号:
U451.2
DOI:
10.19815/j.jace.2021.04102
文献标志码:
A
摘要:
为探究单斜构造软硬互层围岩隧道在不同岩层倾角下的变形特征,以渭源至武都高速公路木寨岭隧道工程为依托,对炭质千枚岩和砂质板岩互层围岩隧道开展了现场调研和现场监测,分析了隧道变形特征及影响因素; 利用有限差分软件FLAC 3D建立三维数值模型,研究了不同岩层倾角下的隧道变形规律; 针对不同的变形特征,总结了针对性的隧道变形控制措施。结果表明:隧道变形主要受岩层倾角和地下水影响,在单斜构造地层条件下隧道呈现出明显的非对称变形,隧道一侧岩层易发生弯曲变形和破坏,建议采用“非对称布设和长-短组合搭配”的预应力锚索对围岩进行主动加固; 在地下水汇集的情况下,隧道另一侧岩层易沿弱面发生顺层滑移破坏,应注意排水,避免地下水在初期支护背后汇集,减小地下水对围岩稳定性及初期支护变形的影响; 当岩层倾角小于50°时,隧道变形表现为沉降大于水平收敛; 当岩层倾角大于50°时,隧道变形则表现为水平收敛大于沉降; 隧道最大沉降随岩层倾角呈三角函数规律变化,当岩层倾角为40°～50°时,隧道沉降达到最大值; 最大收敛变形随岩层倾角呈指数规律变化,即岩层倾角越大,隧道收敛变形越显著。
Abstract:
In order to study the deformation characteristics of soft and hard interbedded surrounding rock tunnels under different rock dip inclination with tilted stratum, the Muzhailing expressway tunnel project from Weiyuan to Wudu was selected as the research object. The field investigation and field monitoring were carried out for the tunnel with carbonaceous phyllite and sandy slate interbedded surrounding rock. The deformation characteristics and influencing factors of the tunnel were analyzed. A three-dimensional numerical model was established using the finite difference software FLAC 3D to study the deformation law of the tunnel under different rock dip inclinations.According to different deformation characteristics, the corresponding control measures were summarized. The results show that the tunnel deformation is mainly affected by the dip inclination and groundwater. Under the tilted stratum, the tunnel presents obvious asymmetric deformation, and the rock stratum on one side of the tunnel is prone to bending deformation and failure. The prestressed anchor cable with “asymmetric layout and long-short combination” should be used to strengthen the surrounding rock. Under the condition of groundwater collection, the stratum on the other side is prone to bedding sliding failure along the weak plane. Attention should be paid to drainage to avoid the groundwater gathering behind the primary support, so as to reduce the influence of groundwater on the stability of surrounding rock and the deformation of primary support. When the dip inclination is less than 50°, the settlement of tunnel is greater than the horizontal convergence deformation. When the dip inclination is greater than 50°, the horizontal convergence deformation is greater than the settlement of tunnel. The maximum settlement deformation changes in the form of trigonometric function with the dip inclination. When the dip inclination is in the range of 40° to 50°, the settlement deformation reaches the maximum. The maximum convergence deformation changes exponentially with the dip inclination of the rock. With the increase of rock dip inclination, the convergence deformation of tunnel becomes more significant.

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备注/Memo

备注/Memo:
收稿日期:2021-04-26
基金项目:国家自然科学基金重点项目(41831286); 国家自然科学基金青年科学基金项目(51808049)
作者简介:张立鑫(1994-),男,甘肃兰州人,工学博士研究生,E-mail:976232050@qq.com。
通信作者:陈建勋(1969-),男,陕西韩城人,教授,博士研究生导师,工学博士,E-mail:chenjx1969@chd.edu.cn。
更新日期/Last Update: 2021-11-01