摘要
高地应力软岩隧道施工中常常发生大变形地质灾害,给工程的安全施工和建设管理带来极大的困难。文章依托兰渝铁路高地应力软岩隧道,进行了高地应力软岩隧道围岩分级,制定了初期支护破坏准则,同时建立了地应力合理释放与有效约束之间的平衡。在高地应力软岩隧道设计与施工中,通过采取预留变形量、合理的初期支护、可靠的开挖工法、关键部位锚注加强、动态支护补强等5项技术措施,有效地控制了大变形的发生,达到了初期支护不破坏、不拆换的目的,保证了工程的安全快速建设。
It is very common for soft rock tunnels with high ground stress to incur deformation during construction, which causes many difficulties regarding safe construction and efficient management. Based on a soft rock tunnel with high ground stress on the Lanzhou-Chongqing railway, this paper classifies the soft rock mass and establishes the cri- teria for primary support failure and the balance between the reasonable ground stress release and effective restraint. As for the design and construction of a soft rock tunnel with high ground stress, such measures as reserved deformation allowance, reasonable primary support, reliable excavation method, and anchoring and grouting reinforcement at key positions were carried out to effectively control the deformation, guaranteeing safe and rapid construction.
出处
《现代隧道技术》
EI
北大核心
2012年第6期13-22,69,共11页
Modern Tunnelling Technology
关键词
高地应力
软岩隧道
变形控制
High ground stress
Soft rock tunnel
Deformation control
