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隧道建设(中英文) ›› 2021, Vol. 41 ›› Issue (S2): 274-283.DOI: 10.3973/j.issn.2096-4498.2021.S2.035

• 研究与探索 • 上一篇    下一篇

类岩堆体地层结构特征与隧道围岩稳定性分析:以云南建(个)元高速公路他依隧道为例

程浩1, 曹振生1, 张少强1, 汤维宇1, 李小昌2, 张子新2, *   

  1. 1. 中电建路桥集团有限公司, 北京〓100048; 2. 同济大学土木工程学院地下建筑与工程系, 上海〓200092
  • 出版日期:2021-12-31 发布日期:2022-03-16
  • 作者简介:程浩(1989—),男,河南南阳人,2017年毕业于西安交通大学,建筑与土木工程专业,硕士,工程师,主要从事隧道工程及复杂环境下结构破坏理论研究工作。Email: 271723168@qq.com。 *通信作者: 张子新, Email: zxzhang@tongji.edu.cn。

Structural Characteristics of TalusLike Rock Mass and Tunnel Stability Analysis: a Case Study of Tayi Tunnel of JianshuiYuanyang Highway

CHENG Hao1, CAO Zhensheng1, ZHANG Shaoqiang1, TANG Weiyu1, LI Xiaochang2, ZHANG Zixin2, *   

  1. 1. POWERCHINA Roadbridge Group Co.KG-*3, Ltd.KG-*3, Beijing 100048, China; 2. Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China
  • Online:2021-12-31 Published:2022-03-16

摘要: 为探究类岩堆体地层结构的复杂地质特性与基本结构特征,分析隧道施工大变形及塌方机制并研究隧道围岩稳定性特征,以云南建(个)元高速公路他依隧道为例,采用现场调研与踏勘,变形量测以及围岩压力监测等方法,从类岩堆体基本结构特征、隧道建设工程问题与稳定性支护措施3方面进行深入研究与总结。结果表明: 类岩堆体围岩地层结构松散,成分复杂,极易受到开挖扰动作用影响,变形影响范围约为掌子面后方30 m;开挖后易出现大变形、塌方、初期支护结构破坏及突水突泥等灾害现象。开挖导致围岩变形与压力快速增大,最大变形接近350 mm,最大围岩压力350 kPa,钢拱架内力超过250 MPa,中下台阶开挖会明显降低上部结构受力,且隧道断面内变形与受力具有极度不均匀性。通过增加预留变形量,加大钢拱架型号,提升初期支护结构强度与刚度,增设双层护拱与加强拱脚支撑,注重超前加固与注浆等联合措施,可以保证类岩堆体隧道施工的安全与稳定。

关键词: 类岩堆体, 结构特征, 隧道稳定性, 现场监测, 支护措施

Abstract: To investigate the geological and structural characteristics of the taluslike rock mass, analyze the mechanisms of large deformation collapse during tunnel excavation, and explore the tunnel stability, a case study is conducted of Tayi tunnel of the JianshuiYuanyang highway. Detailed study is carried out on the basic structural characteristics of taluslike rock mass, engineering problems during tunnel construction, and support measures using site survey, field investigation, deformation measurement, and surrounding rock pressure monitoring. The results show the following: (1) The surrounding rock mass has a complex and loose structure, which is easily affected by the excavation perturbation. The influence range of deformation is about 30 m behind the tunnel face. (2) Some disasters such as large deformation, collapse of excavation face, failure of the primary lining, and water inrush are easy to occur after excavation. The surrounding rock deformation and stress increase rapidly due to tunnel excavation, the maximum deformation is about 350 mm, the maximum surrounding rock pressure is 350 kPa, and the internal force of steel arch frame exceeds 250 MPa. It is also found that the excavation of the middle and lower benches can obviously reduce the pressure and deformation around the upper bench. The deformation and pressure along the tunnel section are extremely uneven due to the uniform excavation profile. The safety and stability of tunnel construction in the taluslike rock mass can be guaranteed by enlarging the reserved deformation, improving the type of steel arch and the strength and stiffness of the primary support, installing doublelayer steel arch, strengthening the arch foot support, and implementing advance reinforcement and grouting.

Key words: taluslike rock mass, structural characteristic, tunnel stability, field monitoring, support system