高烈度地震区椅式抗滑支挡结构抗震性能研究  

Seismic Capacity of Chair-shaped Anti-sliding Retaining Structure in High Intensity Earthquake Areas

作　　者：胡会星[1] 李宁[1] 任华锋[1] Hu Huixing;Li Ning;Ren Huafeng(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《特种结构》2023年第5期112-117,共6页Special Structures

摘　　要：针对位于9度高烈度地震区的某山区铁路陡坡工点,采用三维有限元分析软件,对椅式复合抗滑支挡结构的结构位移及内力动力响应进行分析,数值计算结果表明,复合抗滑支挡结构峰值位移较小,最大值为161.44mm,结构抗震性能好;左侧椅式桩板墙主桩、副桩桩身弯矩均呈Ω型,剪力呈S型,横梁弯矩和剪力均呈正弦分布,结构弯矩峰值位于副桩桩身中部附近,剪力峰值位于副桩与横梁连接处,需加强副桩中部抗弯能力设计,同时提高副桩与横梁节点处的抗剪能力;右侧锚索桩桩身弯矩呈Ω型分布,剪力呈S型,弯矩峰值位于锚索桩身中部,正负剪力峰值基本相当,锚索桩弯矩峰值偏大,因此需在桩身增设1~2排锚索以减少桩身弯矩。For a railway steep slope construction site located in a mountainous area with high intensity earthquake of 9 degrees,the structural displacement and internal force dynamic response of chair-type composite anti sliding retaining structure were analyzed by means of three-dimensional finite element analysis software.The numerical calculation results show that:The composite anti-slide retaining structure has a small peak displacement,with a maximum value of 161.44mm,and has good seismic performance.The bending moment of the main and auxiliary piles of the left chair type pile plate wall are both Ω shape,and the shear force is S shape.The bending moment and shear force of the beam are sinusoidal in distribution.The peak value of structural bending moment is located near the middle of the auxiliary pile shaft,and the peak value of shear force is located at the connection between the auxiliary pile and the beam.It is necessary to strengthen the design of the bending resistance of the middle of the auxiliary pile,while improving the shear resistance of the joints between the auxiliary pile and the beam.The bending moment of the right anchor pile shaft is distributed in an Ω shape,and the shear force is S shape.The peak value of the bending moment is located in the middle of the anchor pile shaft.The positive and negative shear force peaks are basically the same,and the peak value of the bending moment of the anchor pile is relatively large.Therefore,it is necessary to add 1-2 rows of anchor cables to the pile shaft to reduce the bending moment of the pile shaft.

关 键 词：复合抗滑支挡结构 陡坡地段 椅式桩板墙 三维数值模拟 位移响应 内力响应 

分 类 号：U211.9[交通运输工程—道路与铁道工程] U213.15