基于可拓层次分析法的盾构隧道近接施工风险评估

Risk Assessment of Shield Tunnel Close Construction Based on Extension Analytic Hierarchy Process

摘要: 为进行盾构隧道近接施工风险评估，分析风险影响因素，确定风险等级，本文基于层次分析法与可拓学理论，建立可拓层次风险评价模型来对隧道近接施工风险进行评价，构建多层次评价指标体系，计算各指标的权重值与关联度。引入深惠城际某盾构隧道下穿既有隧道与桥梁桩基工程，依据可拓层次风险评价模型进行施工风险评估。研究结果表明：周边建构筑物的存在对施工风险的影响最大，其次地层岩性也对施工风险的影响较大；总目标最大综合关联度为0.114，属于Ⅱ级，对应评价级别为“较轻”。该模型可为盾构隧道近接施工风险评估提供参考。

Abstract: In order to carry out the risk assessment of shield tunnel proximity construction, analyze the risk influencing factors and determine the risk level, this paper based on the analytic hierarchy process and extension theory, established the extension level risk assessment model to evaluate the tunnel proximity construction risk, built a multi-level evaluation index system, and calculated the weight value and correlation degree of each index. A shield tunnel under the existing tunnel and bridge pile foundation project is introduced in the Shenzhen-Huizhou intercity, and the construction risk assessment is carried out according to the extension level risk assessment model. The results show that the existence of surrounding structures has the greatest influence on the construction risk, followed by the formation lithology. The maximum comprehensive correlation degree of the total objective is 0.114, which belongs to the Ⅱ level and corresponds to the “light” evaluation level. This model can provide a reference for risk assessment of shield tunnel proximity construction.