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现代隧道技术 2017, Vol. 54 Issue (3) :174-180    DOI:
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雁门关隧道挤压性围岩变形控制技术
(石家庄铁道大学土木工程学院, 石家庄 050043)
Deformation Control Techniques for the Yanmenguan Tunnel in Squeezing Surrounding Rocks
(Shijiazhuang Tiedao University, Civil Engineering College, Shijiazhuang 050043)
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摘要 北同蒲取直线雁门关隧道软弱围岩段埋深大, 构造应力水平高, 给隧道施工变形控制造成了极大困难。文章根据雁门关隧道挤压性围岩的工程特性, 对洞室变形控制措施进行了研究。首先通过有限差分法(FLAC3D) 数值计算确定了弧形导坑预留核心土三台阶七步开挖法的核心土合理长度; 其次根据隧道塑性区范围与形状优化了系统锚杆的长度; 而后通过对双层支护力学效应及内层支护施作时机的研究, 得出理论上雁门关隧道的内层支护最佳时机为内层支护与外层仰拱同时施作; 最后通过数值计算和现场工程实践, 形成了 “3~4 m核心土长度+超前支护+优化设计的系统锚杆及锁脚锚管+双层支护 (H175+I22a)” 的雁门关隧道挤压性围岩变形综合控制技术。该技术对在构造应力发育的软岩地区修筑隧道具有一定的借鉴意义。
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Abstract: The section of soft surrounding rock around the Yanmenguan tunnel, which exhibits a straight align? ment, has large overburdens and tectonic stresses, which is extremely challenging for deformation control during tunnel construction. Considering the characteristics of the squeezing surrounding rock around the Yanmenguan tunnel,a study was conducted with respect to measures for excavation deformation control. The Finite Differential Method (FLAC3D) was used to determine the rational length of the reserved core soil of the arced pilot tunnel during threebench seven- step construction, and the length of the system anchor bolt was optimized based on the scope and shape of the plastic zone of the tunnel surrounding rock. Furthermore, a study on the mechanical effect of the double-layer support and the construction time of the inner support was carried out: it concludes that it is best for construction of the inner support to take place at the same time as that of the inverted arch of the outer support. Comprehensive deformation control techniques, which include a 3~4 m long core soil, advanced support, an optimized system anchor bolt, a feet-locked anchor bolt and double-layer support (H175+I22a), are proposed based on numerical simulation and engineering practice that consider the squeezing surrounding rock around the Yanmenguan tunnel.
KeywordsSqueezing surrounding rock,   Numerical simulation,   Double-layer support,   Deformation control tech? niques     
基金资助:

基金项目: 国家自然科学基金项目(51378321,51478277); 河北省自然科学基金项目(E2013210119); 河北省高等学校科学技术研究项目(DZ2016122)

作者简介: 作者简介: 韩现民(1970-), 男, 副教授, 博士, 主要从事隧道工程方面的研究工作, E-mail: hanxianmin22@163.com.
引用本文:   
.雁门关隧道挤压性围岩变形控制技术[J]  现代隧道技术, 2017,V54(3): 174-180
.Deformation Control Techniques for the Yanmenguan Tunnel in Squeezing Surrounding Rocks[J]  , 2017,V54(3): 174-180
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