摘要
由于地质条件的复杂性及不可预见性,水下盾构隧道施工安全风险评估已经成为地下工程研究的重要课题。文章以南京纬三路过江通道工程为背景,对盾构段施工风险因素的辨识和施工风险的评价进行了分析,并制定了各风险因素的控制措施。分析结果表明:南京纬三路过江通道带压开舱作业是盾构长距离穿越高水压、强透水复合地层时风险控制的首要目标,可以从减少开舱更换刀具的次数、设定合理的切口压力及确保开挖面形成稳定泥膜等方面降低风险;盾构掘进过程的风险控制,主要通过检测盾构掘进参数的变化、停机分析参数异常原因等方面进行;各种风险应急预案和应急物资设备等风险控制措施的完备,也是减少风险损失的重要措施。该研究对类似工程的风险分析和控制有参考意义。
Because of the complexity and uncertainty of geological conditions, risk assessments for the construc- tion safety of underwater shield tunnels have become an important research topic in underground engineering. Based on the Nanjing Weisan Road river-crossing tunnel construction, this paper analyzes the identification of construction risk factors and evaluation of construction risks in the shield-driven section and formulates control measures for the various risk factors. The analysis results show that hyperbaric intervention in the shield chamber is the primary goal of risk control for such shield tunnels as the Nanjing Weisan Road river-crossing tunnel, which passes through mixed ground with high water pressure and permeability for long distances. Risk may be re- duced by reducing the changing times of cutters, setting a reasonable face support pressure and ensuring the for- mation of a stable filter cake on the working face. Risk during the process of shield tunnelling is mainly con- trolled by the detection of shield tunnelling parameters and cause analysis of parameter anomalies while the shield machine is shut down; complete risk control measures, such as a risk emergency plan and emergency supplies, are also important measures for reducing risks.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第4期49-54,共6页
Modern Tunnelling Technology
基金
交通部建设科技项目(2013 318 Q03 030)
