富水砂土互层隧道真空降水设计及施工技术

Vacuum Precipitation Design and Construction Technology for Cross-bed Tunnel with Water-rich Sand

以蒙华铁路阳城隧道施工为背景,介绍陕北地区黄土高原侵蚀性梁峁沟谷地层中富水砂土互层设计及施工技术。对于该类富水砂土互层物理特征造成隧道施工极易引发涌水、涌砂、塌方等现象,结合现场工程地质特性、水文地质,隧道内水的补给形式和涌水量和变化规律采取真空降水治水设计和技术措施,以保证隧道施工安全,确保工程顺利施工。

Taking the construction of the Yangcheng Tunnel of the Menghua Railway as the background, this paper introduces thedesign and construction technology of the interbedded layer of water-rich sandy soil in the eroded Liangshugou Formation in the LoessPlateau of northern Shaanxi. For this kind of water-rich sand soil, the physical characteristics easily cause water inrush, sand inrush, andlandslides in tunnelling. Combined with the engineering geological characteristics, hydrogeology, and the form of water recharge and waterinflow in the tunnel, vacuum precipitation water control measures are adopted to ensure tunneling safety and ensure smooth construction.