浅埋铁路隧道CRD法施工对地表变形影响的数值分析

Numerical analysis of surface deformation for shallow railway tunnel construction of CRD method

针对龙厦铁路石桥头隧道工程围岩软弱,埋深浅的特点,应用数值分析手段,分析了浅埋铁路隧道在CRD法下施工,对地表沉降变形的影响。结果表明:CRD法下隧道各部施工对地表沉降均有影响,掌子面上部开挖产生的地表沉降明显大于下部,纵向地表沉降随隧道开挖过程分为三个阶段。结合分析结果,文章指出了施工过程中应采取的相应措施。

Considered the ShiQiaotou tunneling of Longxia railway is weak surrounding rock and shallow burial, this paper analysis the surface deformation for shallow railway tunnel construction of CRD method. The result shows that The CRD method tunnel under the ministries construction of the surface subsidence have an impact, surface subsidence for excavation of the upper tunnel face was significantly larger than the lower, the longitudinal settlement with tunneling process is divided into three stages. Combined with the results, The paper pointed out the corresponding measures that should be took in the construction process.