隧道CRD工法中台阶长度对掌子面稳定性影响研究

The influence research on step length to tunnel face stability in tunnel CRD method

以某左右线分离式四车道隧道洞口段为例,建立了三维数值仿真模型,对采用4步CRD法施工时台阶长度对掌子面稳定性的影响进行了研究,研究表明,CRD法分部开挖时,掌子面纵向位移随分部开挖台阶长度增大而减小,台阶长度增大有利于掌子面稳定。

Taking a left-right lines separate four lane tunnel portal section as an example, this paper established 3D numerical simulation, re-searched the influence of step length to tunnel face stability using four step CRD method construction, the research showed that the CRD method subsection excavation, the longitudinal displacement of tunnel face subsection excavation increased with step length, the step length increased conducive to the stability of tunnel face.