长江科学院院报 ›› 2022, Vol. 39 ›› Issue (12): 68-74.DOI: 10.11988/ckyyb.20221056

• 软弱围岩稳定分析 • 上一篇    下一篇

排水结构设置后软岩隧洞的渗流-应力耦合分析

毕发江1, 何军2, 张雨霆2, 李梅3, 朱徐梅3   

  1. 1.云南省滇中引水工程建设管理局,昆明 650205;
    2.长江科学院 水利部岩土力学与工程重点实验室,武汉 430010;
    3.云南省滇中引水工程有限公司,昆明 650205
  • 收稿日期:2022-08-19 修回日期:2022-09-28 出版日期:2022-12-01 发布日期:2022-12-01
  • 作者简介:毕发江(1976-),男,云南大理人,高级工程师,主要从事隧道工程施工工作。E-mail: bifajiang@163.com
  • 基金资助:
    国家自然科学基金项目(51979008);云南省重大科技专项计划项目(202102AF080001-2);长江科学院创新团队项目(CKSF2021715/YT);中央级公益性科研院所基本科研业务费项目(CKSF2021458/YT)

Seepage-Stress Coupling Analysis of Soft Rock Tunnel with Drainage Structure

BI Fa-jiang1, HE Jun2, ZHANG Yu-ting2, LI Mei3, ZHU Xu-mei3   

  1. 1. Construction Administration Bureau of Central Yunnan Water Diversion Project, Kunming 650205, China;
    2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute,Wuhan 430010, China;
    3. Central Yunnan Water Diversion Project Co., Ltd., Kunming 650205, China
  • Received:2022-08-19 Revised:2022-09-28 Published:2022-12-01 Online:2022-12-01

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摘要： 高外水作用下,深埋软岩隧洞围岩-支护结构安全将受到极大挑战。为了降低高外水压对软岩隧洞围岩-支护体系的影响,较常见的工程处理措施为在隧洞周围布置排水结构,以降低洞周外水压力。笔者首先提出了一种简便的隧洞围岩-衬砌结构渗流-应力分析思路。然后,以某过断层带深埋软岩隧洞为研究对象,通过开展隧洞施工期、运行期渗流-应力耦合分析,研究了软岩隧洞排水结构的排水效应。研究发现,在注浆圈和排水结构的综合作用下,隧洞衬砌附近的水力比降较小,注浆圈水力比降较大,使注浆圈承担绝大部分外水荷载,而衬砌承担少部分外水荷载;在软岩和衬砌的变形协调作用下,最终形成注浆圈与衬砌的协同承载效应,有效提高了隧洞的运行安全水平。

关键词: 输水隧洞, 软岩, 高外水压, 排水结构, 渗流-应力耦合分析

Abstract: The safety of surrounding rock and support structures of deep-buried soft rock tunnel is faced with great challenges under the action of high external water pressure. Drainage structure is a common engineering treatment to alleviate the impact of external water pressure on the surrounding rock and support structure of soft rock tunnel. A simple seepage-stress coupling scheme for tunnel’s surrounding rock-lining structure is first established. The drainage effect of the drainage structures of a deep-buried soft rock tunnel crossing a fault zone is investigated through seepage-stress coupling analysis in construction period and operation period. Under the combined action of grouting ring and drainage structures, the hydraulic gradient near tunnel lining is small while the hydraulic gradient of grouting ring is large. As a result, the grouting ring bears most of the external water load, while the tunnel lining bears a small part of the external water load. In addition, under the deformation compatibility between soft rock and lining, the co-bearing effect between grouting ring and lining is finally formed, which effectively improves the safety of the tunnel in operation period.

Key words: water conveyance tunnel, soft rock, high external water pressure, drainage structure, seepage-stress coupling analysis

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