外部土压对预应力双层衬砌受力与变形影响研究  

Study on Influence of External Earth Pressure on Stress and Deformation of Prestressed Double-layer Lining

作　　者：于晗 陈昱弛 王彦东 陈宣 苏恒[3] YU Han;CHEN Yuchi;WANG Yandong;CHEN Xuan;SU Heng(Sinohydro Bureau No.7 Co.,Ltd.,Chengdu,Sichuan610000,China;Chengdu Hydroelectricity Construction Engineering Co.,Ltd.of Sinohydro Bureau No.7 Co.,Ltd.,Chengdu,Sichuan611100,China;Southwest Jiaotong University,Chengdu,Sichuan610081,China)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都610000 [2]中国水利水电第七工程局成都水电建设工程有限公司,四川成都611100 [3]西南交通大学,四川成都610081

出　　处：《施工技术（中英文）》2024年第19期51-57,共7页Construction Technology

基　　金：国家自然科学基金重大项目(51991394)。

摘　　要：为了探究不同外部土压对预应力双层衬砌结构的影响,依托珠三角某水工盾构隧道工程,利用ABAQUS进行数值模拟,采用数理统计的方法,分析了5种土压工况下双层衬砌的变形规律和力学特性。研究结果表明:施工期与运行期双层衬砌变形均呈“横鸭蛋”形椭变;施工期预应力内衬椭变程度、环向压力以及接触应力基本不受外界土压变化影响;施工期管片外衬横向椭变程度、环向压力以及接触应力会随着外部土压增大而增大;运行期双层衬砌椭变程度、环向压力和拱顶拱底处接触应力均随外部土压增大而增大,但拱腰处接触应力几乎不受土压影响;运行期预应力内衬出现环向拉应力且随着外部土压增大而减小,但无受拉开裂风险;运行期预应力内衬环向最大压应力位置由施工期的锚具槽处偏移至拱腰处;运行期管片外衬仍为全截面受压;由于运行期间的内水压对外部土压的抵消作用,双层衬砌的椭变程度、环向应力以及径向应力相较于施工期均有所减少。In order to explore the influence of different external earth pressure on the prestressed double-layer lining structure,based on a hydraulic shield tunnel project in the Pearl River Delta,numerical simulation was carried out by using ABAQUS,and the deformation law and mechanical characteristics of double-layer lining under five earth pressure conditions were analyzed by mathematical statistics.The results show that:the deformation of double-layer lining in the construction period and operation period are all“horizontal duck egg”ellipse;the ellipse degree,circumIn order to explore the influence of different external earth pressure on the prestressed double-layer lining structure,based on a hydraulic shield tunnel project in the Pearl River Delta,numerical simulation was carried out by using ABAQUS,and the deformation law and mechanical characteristics of double-layer lining under five earth pressure conditions were analyzed by mathematical statistics.The results show that:the deformation of double-layer lining in the construction period and operation period are all“horizontal duck egg”ellipse;the ellipse degree,circumferential pressure and contact stress of prestressed lining in the construction period are basically not affected by the change of external earth pressure;the transverse ellipse degree,circumferential pressure and contact stress of outer lining in the construction period increase with the increase of external earth pressure;the ellipse degree,circumferential pressure and contact stress of double-layer lining in the operation period increase with the increase of external earth pressure,but the contact stress at the arch waist is almost not affected by the earth pressure;the tensile stress of prestressed lining in the operation period appears and deIn order to explore the influence of different external earth pressure on the prestressed double-layer lining structure,based on a hydraulic shield tunnel project in the Pearl River Delta,numerical simulation was carried out by using ABAQUS,and the de

关 键 词：水工隧洞 外部土压 预应力衬砌 数值模拟 变形 

分 类 号：U459[建筑科学—桥梁与隧道工程]