设计、施工、监测

断层破碎带围岩工程特性及隧道施工影响研究

  • 肖时辉 ,
  • 曹雄 ,
  • 李伟鹏 ,
  • 林彬彬 ,
  • 李小刚
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  • 1.珠海大横琴股份有限公司,广东 珠海 519070;
    2.珠海市规划设计研究院,广东 珠海 519000;
    3.广东省滨海地区防灾减灾工程技术研究中心,广东 珠海 519000;
    4.中铁十八局集团第一工程有限公司,河北 涿州 072750
肖时辉(1973—),男,湖南邵阳人,硕士,教授级高级工程师,主要从事工程建设及管理方面的研究工作。E-mail:502317902@qq.com
曹雄(1995—),男,湖南益阳人,硕士,主要从事岩土工程计算与应用方面的研究工作。E-mail:xcao43@126.com

收稿日期: 2024-08-19

  网络出版日期: 2025-06-13

基金资助

广东省住房和城乡建设厅科技创新计划项目(2022-K4-065552,2020-K4-534762);珠海市产学研合作项目(ZH22017001200149PWC)

Study on the Engineering Characteristics of Surrounding Rock in Fault Fracture Zone and the Influence of Tunnel Construction

  • Xiao Shihui ,
  • Cao Xiong ,
  • Li Weipeng ,
  • Lin Binbin ,
  • Li Xiaogang
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  • 1. Zhuhai Dahengqin Co., Ltd., Zhuhai, Guangdong 519070, P.R. China;
    2. Zhuhai Institute of Urban Planning & Design, Zhuhai, Guangdong 519000, P.R. China;
    3. Guangdong Coastal Area Disaster Prevention and Mitigation Engineering Technology Research Center, Zhuhai, Guangdong 519000, P.R. China;
    4. China Railway 18th Bureau Group No.1 Engineering Co., Ltd., Zhuozhou, Hebei 072750, P.R. China

Received date: 2024-08-19

  Online published: 2025-06-13

摘要

针对穿越断层破碎带的大断面隧道,通过室内试验研究岩样力学与渗透特性,基于岩体完整性指数与物理力学指标的相关性,量化不同破碎程度下的围岩参数指标。考虑围岩渗透性随围压变化,建立三维数值模型,分析破碎带围岩工程特性对隧道变形的影响规律,并通过现场监测掌握隧道变形与支护结构受力变化。结果表明:(1)破碎带岩样力学性质受水-岩作用影响大,饱和状态下岩样峰值应力相较干燥状态显著减小;(2)破碎带岩样渗透率随围压增大呈对数关系减小,当围压超过裂纹闭合应力后,岩样渗透贯通水压接近;(3)随断层破碎带岩体完整性指数Kv减小,隧道拱顶最大沉降量呈对数关系增大,渗流作用对隧道变形不利影响增大;(4)通过采取合理的加强支护措施及参数,隧道安全穿越断层破碎带里程段。研究成果可作为工程应用参考。

本文引用格式

肖时辉 , 曹雄 , 李伟鹏 , 林彬彬 , 李小刚 . 断层破碎带围岩工程特性及隧道施工影响研究[J]. 地下空间与工程学报, 2025 , 21(3) : 1038 -1049 . DOI: 10.20174/j.JUSE.2025.03.33

Abstract

For large-section tunnels crossing fault fracture zones, indoor experiments were conducted to study the mechanical and permeability characteristics of the rock specimen. Based on the correlation between rock integrity index and physical and mechanical indicators, the parameters of surrounding rock under different degrees of fragmentation were quantified. Considering the permeability of surrounding rock changes with confining pressure, a three-dimensional numerical model was established to analyze the impact of the engineering characteristics of fractured zone surrounding rock on the tunnel deformation. Through on-site monitoring, the deformation of the tunnel and the stress changes of the support structure are mastered. The results show that: (1) The mechanical properties of the rock specimen in the fractured zone are greatly affected by the water-rock interaction, and the peak stress of the rock specimen in the saturated state is significantly reduced compared to the dry state. (2) The permeability of the rock specimen in the fractured zone decreases in a logarithmic relationship with the increase of confining pressure. When the confining pressure exceeds the crack closure stress, the penetration water pressure of the rock sample approaches. (3) As the integrity index Kv of the rock mass in the fault fracture zone decreases, the maximum settlement of the tunnel arch increases in a logarithmic relationship, and the adverse effect of seepage on tunnel deformation increases. (4) By taking reasonable strengthening support measures and parameters, the tunnel can safely pass through the mileage section of the fault fracture zone, which can be used as a reference for engineering applications.

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