旋喷桩在盾构法隧道端头井洞口土体加固工程中的应用

Application of High-pressure Spiral Jet Grouting Piles in Shield Tunnel Portal Soil Reinforcement Engineering

摘要:

盾构法隧道在进行盾构机的始发或到达作业时，当既有端头井洞口挡土墙结构凿除后，保证该位置土体在盾构机刀盘贯入或脱离地层前一段时间内的稳定就成了盾构机始发或到达施工的关键。结合工程实例，从高压注浆原理、注浆参数和施工工艺等方面阐述了二重管旋喷桩在盾构法隧道端头井洞口土体加固工程中的应用。再者，针对旋喷桩加固以及与其相关的盾构始发或到达施工技术方面的一些问题也提出了一些建议和看法。

Abstract:

When the shield launching or arrival is under construction in the shield tunnel, it becomes the key to keep the soil stability in a period of the time before the rotary cutter head of shield machine penetrating into or drilling through the stratum. Based on the engineering case, this paper discussed the application of dual pipe highpressure spiral jet grouting piles in shield tunnel portal soil reinforcement about the principle of highpressure grouting, the grouting parameters and the construction technology. And some suggestions are put forward for spiral jet pile reinforcement and construction issues on shield launching or arrival.