Application of high pressure jet grouting pile composite foundation treatment based on backfill soil
高压旋喷桩复合地基于回填土地基处理中的应用

摘要

某地铁绣湖路站前两段埋置于素填土、杂填土等不稳定的土层中，为保证TBM掘进及周围建筑物地基稳定，需对盾构始发区域进行土体加固，以此降低对周围环境的影响，控制地表与基坑变形。针对此类软土地层，采用高压旋喷桩的加固方式以形成水泥加固体，增强地基承载力。文章与工程实例进行结合分析,以高压旋喷桩的加固方法在地铁绣湖路站基坑工程防护中中加以应用,通过方案设计、施工参数确定、浆液配置、安全检查等方面，对高压旋喷桩作为基坑主体支护结构展开研究，并基于研究方案提出设计思路,降低施工对周围环境的施工影响，以期为相近条件下的盾构施工提供技术参考。

Abstract

The first two sections of a subway Xiuhu Road Station are buried in unstable soil layers such as plain fill and miscellaneous fill. In order to ensure the stability of TBM tunneling and the foundation of surrounding buildings, it is necessary to reinforce the soil in the shield launching area, so as to reduce the impact on the surrounding environment and control the deformation of the surface and foundation pit. For this kind of soft soil layer, high pressure jet grouting pile reinforcement method is adopted to form cement reinforcement and enhance foundation bearing capacity. Based on the analysis of engineering examples, this paper applies the reinforcement method of high-pressure rotary jet grouting pile in the protection of foundation pit engineering of subway Xiuhu Road Station. Through the aspects of scheme design, construction parameter determination, slurry configuration and safety inspection, this paper studies the high-pressure rotary jet grouting pile as the main supporting structure of foundation pit, and puts forward the design idea based on the research scheme to reduce the construction impact on the surrounding environment, so as to provide technical reference for shield construction under similar conditions.