土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (2): 151-.

• 工程实录 • 上一篇    下一篇

双线公路隧道浅埋偏压段塌陷处治

赵 亮   

  1. （云南交投公路建设第五工程有限公司，昆明 030004）
  • 收稿日期:2020-12-21 修回日期:2021-03-10 出版日期:2021-04-23 发布日期:2021-04-23
  • 作者简介:赵 亮(1980-)，男，工程师，研究方向为隧道与桥梁工程的施工技术与项目管理。
  • 基金资助:
    云南交投集团公路建设有限公司科技项目（SG00MLZ1910001）

Remediation of the Crest Collapse at a Shallow Buried Two-Lane Highway Tunnel

ZHAO Liang   

  1. (YCICB Highway No.5 Construction Co. Ltd., Kunming 030004)
  • Received:2020-12-21 Revised:2021-03-10 Online:2021-04-23 Published:2021-04-23

摘要： 公路隧道施工建设中，浅埋偏压隧道施工存在更多的安全风险。某公路双线隧道在浅埋段施工过程中沿洞口方向侧初期支护结构开裂，拱顶发生塌陷。通过对隧道工程地质、水文地质调查与分析，指出拱顶围岩为碎石土，结构松散，不易形成自然承载拱，以及施工期降水影响是造成拱顶塌陷及洞口方向初支开裂的主要原因，提出了塌穴回填、地表封闭、施做锁脚钢管、径向注浆小导管加固、施做洞内管棚、监控量测、仰拱及二衬及时跟进等综合施工处治措施，取得了良好效果。

关键词: 双线公路隧道, 浅埋偏压隧道, 塌陷, 开裂, 处治措施

Abstract: The shallow burred and unsymmetrical pressured highway tunnels have more safety hazards than other tunnels during the construction. A two-lane high tunnel experienced a crest collapse and the cracking in the initial supporting structures towards the shallow buried exit. The geotechnical, hydrological investigations indicated that the loose gravelly and boulderlike soils, which are difficult in the forming of the arching effect, are deposited at the collapsed area. The heavy precipitation was a majoring triggering factor to the crest collapse and the cracking in the tunnel supporting structure. The remediation measures included: backfilling of the collapsed area, ground backfill and improvement; installation of the perforated grouting steel pipes; installation of the pilot radial grouting pipes, installation of the pipe roof, installation of first immediately followed by the  secondary lining as well as construction monitoring.

Key words: two-lane highway tunnel, shallow buried tunnel under unsymmetrical pressure, collapse, cracking, remediation measures

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