小断面两端开挖方式土洞贯通实施方案要点浅析

Elementary Analysis of Key Points in the Implementation Scheme of Soil Tunnel Penetration by Excavation at Both Ends of Small Sections

小断面土洞段贯通实施方案,即贯通段一端采用超前水平高压旋喷桩结合超前帷幕注浆的开挖支护方式,另一端采用三台阶开挖、超前大管棚及注浆支护的方式。通过对山西省小浪底引黄工程某项目的土洞贯通方案进行详细阐述,提出基于两端开挖支护方式下实现隧洞贯通及贯通过程中的安全控制措施。

Small section soil tunnel section through-hole implementation plan,that is,one end of the through-section adopts advanced horizontal high-pressure rotary jet grouting combined with advanced curtain grouting and excavation,and the other end adopts three-step excavation,large pipe shed and grouting the way.Through detailed explanation of the tunnel penetration scheme of a project in the Xiaolangdi Yellow River Diversion Project in Shanxi Province,safety control measures for tunnel penetration and penetration are proposed based on the excavation and support at both ends.