论文部分内容阅读
南华一号隧道是在建的广大(广通~大理)铁路控制性工程之一,其进口段围岩极其软弱破碎,结构面发育,最小覆土厚度仅6m,施工风险极高。围岩稳定性的影响因素众多,施工工艺直接影响围岩卸荷变形,如有处理不当,超过围岩的承载能力,极易造成掌子面失稳以及地表塌陷。为此,为了安全、顺利施工,施工方拟采用CRD工法。结合数值模拟和现场实测手段对CRD工法的在该地质条件下的适应性展开研究,取得了一些列成果,可以为同类型的隧道设计和施工提供借鉴。
Nanhua-1 tunnel is under construction as one of the controlled projects of Guangrao-Dali Railway. The surrounding rock of its entrance section is extremely weak and broken, and its structural surface is developed. The minimum thickness of cover soil is only 6m and the construction risk is extremely high. Surrounding rock stability of the many influencing factors, the construction process directly affects the surrounding rock unloading deformation, if not properly handled, more than the carrying capacity of surrounding rock, can easily lead to the instability of the palm face and surface collapse. To this end, in order to be safe and smooth construction, the contractor intends to adopt the CRD method. The research on the adaptability of CRD method under the geological conditions is conducted by means of numerical simulation and on-the-spot measurement, and some results are obtained, which can provide reference for the same type of tunnel design and construction.