摘要
对地铁隧道施工可能引起的沿线建筑损伤进行风险评估具有重要意义,如何兼顾效率和准确性是隧道下穿建筑风险评估中的一个难题。提出一种改进的三阶段建筑损伤评估方法,在前两个阶段同时从隧道开挖对建筑的危害性和建筑自身的易损性两个角度对隧道下穿建筑的风险进行初筛,在第3阶段对隧道下穿建筑的风险进行多指标详细评估。在风险初筛中,用Peck经验公式和极限拉应变法评估隧道开挖对建筑的危害性,将建筑完损程度和建筑物理特征作为建筑易损性评估的依据。在建筑损伤风险详细评估中建立三维有限元数值模型,并选取多个控制指标综合评估隧道下穿引起的建筑损伤风险。以某盾构隧道下穿砌体建筑工程为例,应用改进三阶段法验证所提方法的合理性,结果表明引入易损性评估作为风险初筛的另一依据可以有效避免低估风险。对比评估结果与实测结果的可知,改进三阶段法能较为准确地评估隧道下穿建筑的风险。
It is of great significance to assess the risk of building damage along the line that may be caused by metro tunnel construction.How to balance efficiency and accuracy is a challenge for risk assessment of tunnel underpass buildings.An improved three-stage building damage assessment method is proposed,in which the risk of tunnel underpass buildings is initially screened in the first two stages simultaneously from the perspective of both the hazard of tunnel excavation to the building and the vulnerability of the building itself,and a detailed multi-indicator assessment of the risk of tunnel underpass buildings is performed in the third stage.In the initial risk screening,Peck empirical formula and the ultimate tensile strain method are used to assess the hazard of tunnel excavation to the building,and the building integrity and the building,physical characteristics are used as the basis for building vulnerability assessment.In the detailed assessment of buildings damage risk,a three-dimensional finite element numerical model is established and multiple control indicators are selected to comprehensively assess the building damage risk caused by tunnel underpass.A shield tunnel underpass masonry building project is taken as an example to verify the rationality of the proposed method,and the results show that the introduction of vulnerability assessment as another basis for initial risk screening can effectively avoid underestimation of risk.The comparison of the assessment results with the measured shows that the improved three-stage method can accurately assess the risk of tunnel underpass buildings.
作者
郭逸凡
郑俊杰
刘辉
GUO Yifan;ZHENG Junjie;LIU Hui(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2024年第4期91-99,共9页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(52078236)。
关键词
改进三阶段法
隧道下穿建筑
建筑损伤
易损性
风险评估
improved three-stage method
tunnel underpass building
building damage
vulnerability
risk assessment
