不同预注浆加固范围时盾构机始发稳定分析

Analysis on Stability of Shield-driven in Different Grouting Reinforcement Range

摘要:

盾构始发作为盾构法施工的关键技术，其稳定性分析至今基本空白，没有相应的计算分析方法，设计主要依靠经验。以广州地铁六号线天平架盾构始发井的设计和施工为背景，采用有限差分软件FLAC3D进行三维有限元模拟的手段，对盾构始发稳定性进行了研究，着重分析了纵向与周围厚度不同加固范围组合时始发段的应力场、塑性区破坏场和位移场，探讨合理的加固厚度和强度。研究成果有望对盾构始发的设计和施工提供科学的理论依据和指导。

关键词:盾构;始发;稳定性;竖井;FLAC3D;加固

Abstract:

Shield-driven is a key technology of shield-construction, but analysis on its stability is nearly a blank without calculation analysis methods, and the design mainly depends on the experience. Based on the design and construction of Tianpingjia Line 6# of Guangzhou metro, the paper made the analysis on the stability by means of finite difference procedure FLAC3D to simulate shield-driven, emphatically analyzed the stress field, destroyed field, and displacement field in different starting segment reinforcing ranges. The paper also discussed the reasonable thickness and strength. The research result is hopeful to provide theoretical basis and instruction for the design and construction of shield-driven.

Key words:shield tunnel; starting; stability; shaft; FLAC3D; reinforcement