地表突发堆载作用下地铁盾构隧道变形机制三维精细化数值模拟研究  

Three-dimensional Elaborate Numerical Modelling Analysis on the Deformation Mechanism of Metro Shield Tunnel Induced by Sudden Surface Surcharge

作　　者：阮恒丰 梁荣柱[2,3] 康成 李忠超 柯宅邦 RUAN Hengfeng;LIANG Rongzhu;KANG Cheng;LI Zhongchao;KE Zhaibang(Institute of Geological Survey,China University of Geosciences(Wuhan),Wuhan 430074,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;College of Civil Engineering and Architecture,Guangxi University,Nanning530004,China;Wuhan Municipal Construction Group Co.,Ltd.,Wuhan 430023,China;Anhui Province Institute of Building Research&Design,Hefei 230088,China;Anhui Key Laboratory of Green Building and Assembly Construction,Hefei 230031,China)

机构地区：[1]中国地质大学(武汉)地质调查研究院,湖北武汉430074 [2]中国地质大学(武汉)工程学院,湖北武汉430074 [3]广西大学土木建筑工程学院,广西南宁530004 [4]武汉市市政建设集团有限公司,湖北武汉430023 [5]安徽省建筑科学研究设计院,安徽合肥230088 [6]绿色建筑与装配式建造安徽省重点实验室,安徽合肥230031

出　　处：《安全与环境工程》2023年第1期35-45,77,共12页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41807262);中国博士后基金面上项目(2019M653308);住房和城乡建设部科学技术计划项目(2021-K-074);安徽省建筑科学研究设计院科研项目(2018JKY-26、2021-52ZC);武汉市政集团科研项目(wszky202013)。

摘　　要：随着临近地铁盾构隧道施工项目的不断增多,地铁盾构隧道上方地表突发堆载事件日益频发,易诱发不均匀沉降、管片破损、渗漏水等一系列病害,严重威胁着地铁的运营安全。目前提出的地表突发堆载作用下地铁盾构隧道有限元模型大多基于连续结构分析,忽视了管片间接头的影响。通过构建管片间接头受力模型,建立了地铁盾构隧道结构三维精细化数值计算模型,研究了地表突发堆载作用下地铁盾构隧道的受力变形机制。结果表明:地铁盾构隧道整体在纵向上出现高斯分布的不均匀沉降,管片环在横向上被压扁成“横鸭蛋”形;管片环内接头张开和错台均集中于堆载宽度范围内,管片环间接头张开和错台分别集中于堆载中心和堆载宽度边缘;地铁盾构隧道沿纵向的沉降大部分由管片环间错台累积贡献,最大累加错台量占最大沉降量的73%;管片环在横向上呈现非协同变形,拱顶沉降量是拱底沉降量的1.5倍,管片环间接头的剪切力由拱顶向拱底逐渐递减;管片环收敛率在堆载中心正下方最大达4.1‰,收敛变形导致拱顶处和拱腰处管片环内接头分别向管片环内部、外部张开,以及拱顶处、拱腰处管片应力集中;堆载中心正下方管片环间截面上的应力分布以29°的中性轴为界,中性轴以上管片受压,中性轴以下管片与螺栓同时受拉。本文所提出的地铁盾构隧道结构变形三维精细化数值模拟方法能够高效、准确地模拟地铁盾构隧道结构和管片间接头部位的受力和变形特点,具有一定的工程应用价值。With the increase of construction projects adjacent to metro shield tunnel,there have benn more and more sudden ground surface surcharge events above metro shield tunnels recently,which may induce uneven settlement,segment damage,water leakage and other disasters,seriously threatening the safety of running metro trains.Currently most numerical methods for predicting deformation of metro shield tunnel due to surface surcharge are based on the continuous structure,which overlooks the effects of the joints in segments.A 3D elaborate numerical model for metro shield tunnel structure is established based on the proposed segmental joint model.The deformation mechanism of metro shield tunnel induced by sudden surface surcharge is extensively investigated.The results show that the overall settlement of metro shield tunnel shows a Gaussian distribution in the longitudinal direction.The segmental rings within the surcharge width are flattened in the transverse direction.Joints in the ring suffer both opening and dislocation within surcharge width,and joints between rings suffer opening below surcharge center and dislocation at the edge of the surcharge width.The dislocation between the adjacent rings dominates the tunnel settlement,and the maximum accumulative dislocation is about 73%of the maximum settlement.Deformation of the segmental ring in the transverse direction is uncoordinated,the maximum settlement in the crown is 1.5 times greater than that in the invert,and the shear force in joints between rings decreases from the crown to the bottom.Below surcharge center,the convergence ratio of the segmental ring reaches 4.1‰,the joints in the ring open towards the inside of the segmental ring at the crown and open towards the outside of the segmental ring at the waist,and segments at the crown and waist are subjected to stress concentration.The stress distribution on the cross section of the segmental ring below surcharge center is divided by a neutral axis of 29°,and segments are subjected to compression on the upper

关 键 词：地表堆载 地铁盾构隧道 管片间接头 精细化建模 数值模拟 

分 类 号：X959[环境科学与工程—安全科学] U455.43[建筑科学—桥梁与隧道工程]