大断面黄土隧道斜井进入正洞的挑顶施工技术

通过对郑西铁路客运专线潼洛川和高桥两座大断面湿陷性黄土隧道三座斜井进入正洞的施工，从安全、进度和经济方面考虑，优选出合理的斜井挑顶施工方案。实施的结果证明，所选用方案工程结构安全，缩短了施工时间，节约了施工费用。

Ripping Construction for Oblique Well of Large Section Loess Tunnel Leading to Positive Curve

This paper focuses on the construction techniques for three oblique wells of large section collapsible loess tunnel- Tongluochuan Tunnel and Gaoqiao Bridge which leads to positive curve on Zheng-Xi PDL, and from the aspects of security, progress and economy, reasonable ripping construction technique has been adopted for oblique wells, the result of which proved the project structure of this technique to be safe, time saving and cost reducing.