盾构隧道管片开裂对结构安全将产生影响,对开裂后隧道管片的安全状态进行评估,是确保隧道安全平稳运行的关键。针对盾构隧道管片开裂对结构安全的影响,提出了一种适用于盾构隧道管片安全状态评价体系。以管片裂缝的空间分布特征和几何特征作为核心评价指标,将定性的比较转换为定量的数学分析。通过结合层次分析法和熵权法,引入博弈论思想对两种权重进行优化,克服了单一赋权法的局限性,增强了模型对实际工程复杂性的适应能力。最后结合工程实例,基于模糊综合评价方法对某软土地区盾构隧道区间进行安全评估。结果表明:该区间段管片损伤程度较重,总体结构损伤级别为Ⅲ级,与现场实际监测数据及病害调查结果相符,验证了评价模型的准确性和有效性,为盾构隧道开裂管片的安全评估提供了理论依据。
The cracking of shield tunnel segments can affect the structural safety of the tunnel, and assessing the safety status of the cracked segments is crucial for ensuring the safe and stable operation of the tunnel. This paper proposes a safety assessment system specifically for shield tunnel segments in response to the impact of cracking on structural safety. The spatial distribution characteristics and geometric features of cracks in the segments are used as core evaluation indicators, and qualitative comparisons are transformed into quantitative mathematical analysis. By combining the Analytic Hierarchy Process (AHP) and Entropy Weight Method (EWM) and introducing game theory to optimize the two weight methods, the limitations of single-weight methods are overcome, enhancing the model's ability to adapt to the complexity of real-world engineering. Finally, an engineering case study is used to evaluate the safety of a shield tunnel section in a soft soil area using a fuzzy comprehensive evaluation method. The results show that the segment damage in this section is severe, with an overall structural damage level of Grade III, which is consistent with the actual monitoring data, thus verifying the accuracy and effectiveness of the assessment model. This study provides a new approach and scientific basis for the safety assessment of cracked shield tunnel segments.
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