越江地铁盾构隧道始发安全风险控制研究

Research on Launching Safety Risk Control in Construction of Metro River-crossing Shield Tunnel

研究目的:盾构出洞及始发的安全风险控制是盾构法隧道施工一个非常重要的环节。结合武汉轨道交通2号线地铁越江隧道泥水盾构工程实际,提出盾构出洞及始发施工的安全风险控制体系,并分析安全风险控制的工程效果,为类似工程提供有益参考。研究结论:(1)快速、有效、可靠地建立工程环境性状与盾构施工参数的平衡状态必须通过事前控制、事中控制和事后控制等完整的施工过程安全风险控制体系来实现;(2)始发过程中应按照有关规范沿隧道纵向轴线位置布设工程监测点,在盾构推进过程中进行跟踪监测,并利用地铁工程安全预警系统进行监测数据的动态分析、预警和反馈,为调整始发掘进段的施工参数提供决策依据。

Research purposes： Control of the safety risks of shield machine launching and gong out of the tnnel is a critical process in construction of shield tunnel. For construction of the river - crossing slurry shield tunnel of the Line 2 of Wuhan metro, this paper presents the safety control system for the shield machine launching and going out of the tunnel and analyzes the application effect of the risk control so as to provide the reference to the similar works. Research conclusions： The rapid, effective and reliable balance between the environment and shield construction parameters can be established by conducting the risk control of the whole process, including the beforehead control, matter control and subsequent control in the construction phrase. In the launching process of the shield machine, the monitoring points should be installed along the vertical axial cord position of tunnel according to the relative standards. During the tunneling of the shield machine, the tracing monitoring should be conducted and the dynamic analysis, the advanced alarm and the feedback should be conducted with the security alarm system for metro construction in order to provide the decision - making basis for adjusting the construction parameters of the launching tunneling section.