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隧道建设(中英文) ›› 2023, Vol. 43 ›› Issue (S1): 313-322.DOI: 10.3973/j.issn.2096-4498.2023.S1.036

• 规划与设计 • 上一篇    下一篇

基于主动支护的木寨岭隧道高地应力软岩大变形预应力锚索支护设计实践

王万平1, 李建斐1 *, 晏鹏博2, 韩常领1   

  1. 1. 中交第一公路勘察设计研究院有限公司, 陕西 西安 710075; 2. 甘肃长达路业有限责任公司, 甘肃 兰州 730000)

  • 出版日期:2023-07-31 发布日期:2023-08-28
  • 作者简介:王万平(1976—),男,陕西富平人,2000年毕业于长安大学,隧道与地下工程专业,本科,正高级工程师,主要从事隧道与地下工程的勘察设计、咨询与科研工作。 E-mail: 443423877@qq.com。*通信作者: 李建斐, E-mail: 277185047@qq.com。

Design Practice of Prestressed Anchor Cable Support Technology for Soft Rock with Extremely High Geostress and Large Deformation in Muzhailing Tunnel

WANG Wanping1, LI Jianfei1, *, YAN Pengbo2, HAN Changling1   

  1. (1. CCCC First Highway Consultants Co., Ltd., Xi′an 710075, Shaanxi, China; 2. Gansu Changda Highway Co., Ltd., Lanzhou 730000, Gansu, China )

  • Online:2023-07-31 Published:2023-08-28

摘要: 为解决在建木寨岭特长公路隧道薄层极软岩在高地应力下发生的挤压性大变形问题,结合现场展开的工程地质分析、设计变更、监控量测工作,提出一种预应力长短锚索+W型钢带+柔性纤维网组合的基于主动支护的设计方案。该方案采用“先锚后支”的施工工艺,采用数值分析和试验段施工对设计方案进行验证。结果表明,预应力长短锚索组合的主动支护能够充分发挥锚索的锚固和悬吊作用加固围岩,提高围岩的抗剪能力,控制围岩形变能的释放态势,有效控制围岩变形,将初期支护变形控制在20 cm以内,减小约50%。在实际施工过程中对锚索防腐、锚索支护参数及锚索施工设备选型等进行优化调整,确保了隧道施工的顺利进行。

关键词: 极高地应力, 软岩隧道, 大变形, 预应力锚索, 支护设计

Abstract:

To control severe squeezing deformation of thin extremely soft rock under high geostress in the Muzhailing tunnel under construction, a design scheme based on active support with combination of prestressed long and short anchor cables, Wshaped steel belt, and flexible fiber mesh is proposed based on engineering geological analysis, design changes, and monitoring and measurement work carried out onsite. The scheme adopts the construction order of anchor first and then support. The design scheme is verified by numerical analysis and test section construction. The results show that the active support can fully reinforce the surrounding rock, improve the shear resistance of surrounding rock, control the release state of deformation energy of surrounding rock, effectively control the deformation of surrounding rock, and control the deformation of supporting within 20 cm(that is 50% reduction). In the engineering practice, anticorrosion, support parameters, and construction equipment selection of anchor cable are optimized and adjusted to ensure the smooth progress of tunnel construction.

Key words: extremely high geostress, soft rock tunnel, large deformation, prestressed anchor cable, support design