盾构隧道管片接缝三元乙丙橡胶密封垫力学性能影响因素敏感度分析  

Sensitivity Analysis of Influencing Factors on Mechanical Properties of EPDM Sealing Gasket of Segment Joint of Shield Tunnel

作　　者：叶美锡 丁文其[1,2] 陈俊伟[3] 金跃郎 刘浩[3] 涂新斌 YE Meixi;DING Wenqi;CHEN Junwei;JIN Yuelang;LIU Hao;TU Xinbin(Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,Hubei,China;State Grid Corporation of China,Beijing 100031,China)

机构地区：[1]同济大学土木工程学院地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]中铁第四勘察设计院集团有限公司,湖北武汉430063 [4]国家电网有限公司,北京100031

出　　处：《隧道建设（中英文）》2019年第S02期200-206,共7页Tunnel Construction

基　　金：国家重点研发计划项目(2017YFC0806004);上海市科委科研计划项目(16DZ1201701)。

摘　　要：为研究盾构隧道管片接缝三元乙丙橡胶密封垫力学性能的影响因素,首先,以实际工程为背景,采用自主设计的试验系统进行试验,并以此验证数值模型的可靠性;然后,利用数值模型,采用正交分析方法,对密封垫断面参数(开孔形状、断面开槽数量、断面开孔率)、密封垫橡胶材料硬度、密封垫拼装姿态(张开量、错位量)进行六因素三水平的密封垫力学性能影响因素的敏感度分析;最后,结合力学性能研究与防水性能预测需求,提出以闭合压缩力、密封垫接触应力分布作为分析指标。研究结果表明:1)针对密封垫装配时所需的闭合压缩力,其影响因素主次顺序为张开量、断面开孔率、橡胶硬度、开槽数量、开孔形状、其他因素以及错位量;2)密封垫接触应力分布的影响因素主次顺序为开孔形状、断面开孔率、错位量、其他因素、张开量、橡胶硬度、开槽数量。根据研究结果选取对密封垫力学性能影响较为显著的因素进行单因素分析,然后根据分析结果及橡胶垫密封垫防水性能预测方法,提出背景工程管片接缝密封垫的优化方案。The study on influencing factors on mechanical properties of ethylene-propylene-diene monomer(EPDM)sealing gasket of segment joint of shield tunnel is of great significance.Hence,a testing system is developed,and the feasibility of the system is verified by case study.And then the 6-factor-and-3-level sensitivity analysis is carried out on influencing factors of mechanical properties of sealing gasket,such as cross-section parameters of sealing gasket(hole shape,groove number and holing rate),hardness of sealing gasket material and assembly posture of sealing gasket(opening and dislocation amount),by numerical model and orthogonal analysis method.Finally,the closed compressive force and contact stress distribution of sealing gasket are regarded as analytical indices considering the requirement of mechanical properties and waterproofing properties of sealing gasket.The results show that:(1)The influencing degree of joint opening amount on the closed compressive force is the greatest,followed by those of cross-section holing rate,rubber hardness,grooving number,hole shape and other factors,and that of dislocation amount is the smallest.(2)The influencing degree of hole shape on contact stress distribution is the greatest,followed by those of cross-section holing rate,dislocation amount,other factors,opening amount and rubber hardness,and that of the grooving number is the smallest.Single factor analysis is carried out on factors that affecting the mechanical properties of sealing gasket greatly to provide optimization scheme for sealing gasket based on analytical results and water-proof property prediction method.

关 键 词：盾构隧道 三元乙丙橡胶密封垫 力学性能 密封垫断面参数 橡胶材料硬度 拼装姿态 正交试验 

分 类 号：U455.46[建筑科学—桥梁与隧道工程]