土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (2): 256-261.

• 专题论述 • 上一篇    下一篇

串珠状溶洞对地铁隧道施工影响的研究

郭书兰1，阎长虹2，俞良晨2，王鹏斌2，彭超林2，闫超1   

  1. （1.安徽建筑大学智能地下探测技术重点实验室，合肥 230601；2.南京大学地球科学与工程学院，南京 210023）
  • 收稿日期:2023-05-30 修回日期:2023-06-08 出版日期:2025-04-30 发布日期:2025-06-03
  • 通讯作者: 闫超(1985-)，男，博士，讲师。主要从事岩土工程研究。
  • 作者简介:郭书兰（1991-），女，博士，讲师，研究方向为城市环境岩土工程。
  • 基金资助:
    国家自然科学基金(42077232)；安徽省住房城乡建设科学技术计划项目(2022YF017)；校引进人才及博士启动基金项目(2022QDZ26)

Study of the Influence of Continuous Karst Rock Cavities on the Subway Tunnel Construction

GUO Shulan1, YAN Changhong2, YU Liangchen2, WANG Pengbin2, PENG Chaolin2， YAN Chao1   

  1. (1.Key Laboratory of Intelligent Underground Survey Technology, Anhui Jianzhu University, Hefei 230601；
    2.School of Earth Science and Engineering, Nanjing University, Nanjing 210023)
  • Received:2023-05-30 Revised:2023-06-08 Online:2025-04-30 Published:2025-06-03

摘要： 随着人口的不断增加，城市交通拥堵问题日趋严重，轨道交通成为缓解城市交通压力的重要发展方向。近年来，苏南地区在进行城市地铁建设的过程中遭遇了一系列的浅埋串珠状岩溶。在总结苏南地区大量地质探测资料的基础上，发现苏南地区普遍发育4种类型的浅埋串珠状溶洞。结合4种串珠状溶洞的发育特征及苏南地区地铁盾构隧道的埋深范围，采用数值模拟的方法，对隧道开挖与溶洞稳定性的力学响应特征进行分析，发现：随着溶洞附近隧道的开挖，应力释放加快，隧道拱顶和拱底的位移随之增加，位移变化曲线的斜率逐渐变陡；串珠状溶洞发育在隧道底部引起的变形要远远大于溶洞发育在隧道顶部所引起的变形；IV型串珠状溶洞发育在隧道底部时，隧道及其围岩的变形最大，而当溶洞发育在隧道顶部时，III型串珠状溶洞对隧道及其围岩变形的影响最大；在隧道开挖完成后，溶洞区域的位移明显大于无溶洞区域，且在溶洞区进行隧道开挖会对无溶洞区隧道和地表的变形产生促进作用；当溶洞位于隧道顶部时，隧道围岩最大主应力的最大值出现在隧道的肩部和腰部，呈不对称分布；当溶洞位于隧道底部时，隧道围岩最大主应力的最大值出现在隧道的顶部，应力较为集中且呈对称分布。


关键词: 苏南地区, 浅埋串珠状溶洞, 地铁隧道, 围岩稳定性, 力学响应, 数值模拟

Abstract: The urban traffic congestion is becoming more and more serious, and the rail transit has become an important development trend to relieve the pressure of the urban traffic. In recent years, a series of shallow buried continuous karst rock cavities have been encountered in the urban subway construction in southern Jiangsu Province. Based on the summarizing of a large amount of geological exploration data, it is found that there are four types of shallow buried continuous karst rock cavities. Combined with the development characteristics of the continuous karst rock cavities and the buried depth range of the subway shielded tunnel in southern Jiangsu Province, the mechanical characteristics of the tunnel excavation and the karst rock cavity stability are analyzed by the numerical simulation method. It is found that with the excavation of the tunnel, the displacement of the vault and the arch bottom of the tunnel increases obviously, and the slope of the displacement curve gradually becomes steep, which indicates that the displacement release rate will increase by the excavation of the karst rock cavities. The deformation caused by the development of the continuous karst rock cavity at the bottom of the tunnel is far greater than that caused by the development of the karst rock cavity at the top of the tunnel; the deformation is the largest when the type IV continuous karst rock cavity is developed at the bottom of the tunnel; when the karst rock cavity is developed at the top of the tunnel, the influence of type III continuous karst rock cavity on the deformation of the tunnel and surrounding rock mass is the greatest; when the karst rock cavity is located at the bottom of the tunnel, the maximum value of the maximum principal stress appears in the tunnel shoulder and waist, which is an asymmetric distribution; when the karst rock cavity is located at the bottom of the tunnel, the maximum value of the principal stress appears at the top of the tunnel, and the stress is concentrated and distributed symmetrically. At the same time, the targeted mitigation measures are proposed for the four types of continuous karst rock cavities in southern Jiangsu Province. The research results can provide the necessary technical support for the tunnel construction in the shallow buried continuous karst rock cavity area, and have a direct significance for the scientific and the quantitative design and the construction of the tunnel.

Key words: Southern Jiangsu Province, Shallow Buried Continuous Karst Rock Cavities, Subway Tunnels, Surrounding Rock Mass Stability, Mechanical Response, Numerical Simulation

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