基于网络分析法盾构下穿隧道风险分析

本文以深圳地铁某始发、到达阶段复合地层下穿既有线为工程依托,首先对其进行了风险分析,取得了两级风险指标。然后,在地铁盾构风险评价中采用网络分析法,以始发复杂地质条件下穿既有线隧道等多风险素为研究对象,以多风险因素专家调查结果为依据,构建风险评价模型,研究分析多层级风险源条件下,风险控制技术的不同层级权重排序。研究得到了盾构施工参数设置与控制不当、上软下硬地层不良影响为排序在首位、次位的风险因素。研究表明,网络层次分析法在地铁盾构工程风险评价中是可行的,可为地铁盾构工程风险控制快速决策提供了依据。

Risk Analysis on Shield TBM Crossing underneath Existing Tunnel Based on Analytic Network Process

This paper is based on one of the initial and arrival stage of the Shenzhen metro line project, which is located beneath the existing line in composite stratum. First of all, risk analysis was carried out and two risk indexes were obtained. Then, the network analytic hierarchy process (AHP) was used in the risk assessment of subway shield TBM, multiple risk factors during initial stage of shield tunnel crossing the existing line under complex geological conditions were studied. Based on the results of expert surveys on multiple risk factors, a risk assessment model was built, and the ranking of different levels of risk control technology under the condition of multiple risk sources were researched. The risk factors of improper setting and control of shield construction parameters and adverse effects of upper soft and lower hard formations were ranked first and second risk factor. The study shows that the network analytic hierarchy process is feasible in the risk evaluation of shield tunneling project, which can provide the basis for rapid risk controlling decision for shield tunneling project.