客运专线超大断面隧道不同工法引起地表变形数值分析

研究目的:通过数值分析方法分析客运专线大断面隧道施工工艺、施工方案的可行性。研究方法:为研究同一围岩条件下隧道开挖而引起地表变形的特性及机理,借助于计算机技术和数值模拟计算,主要介绍了台阶法、CD法的施工工艺及施工方案、建模及计算成果等。研究结果:通过对大断面隧道开挖引起地表变形的数值模拟成果的分析,得出了在同一围岩条件下,采用不同的施工方法开挖隧道引起地表变形的特性和机理,在此基础上提出了相关的施工技术措施。研究结论:客运专线大断面隧道施工工艺繁多,各种工艺在具体应用前必须进行数值模拟计算,使整个隧道过程都处于安全可靠控制范围之内。

Numerical Analysis of Surrounding Rock Deformation for Tunnel Excavation in Passenger Dedicated Railway Line

Research purposes: The paper analyses the construction process of passenger dedicated railway line and the feasibility of excavation techniques by numerical method. Research methods:In order to research the deformation characteristic and behaviors of the surrounding rock during the tunnel excavating, with the help of the computer technology and numerical simulation method. This paper introduces two tunnel excavation methods (step-method and CD-method) and plans, model building, calculation result and so on. Research results:By executing the survey of surface deformation, the paper recommends relying on the dynamic information feed back of deformation survey to ensure the construction safety and optimal design of tunnel excavation. Research conclusions:There are many techniques which can be applied in the construction process of passenger dedicated railway line. To make the safety of the whole construction process under the range of controlling, different tunnel excavation techniques should be analyzed by numerical method before it is applying.