深厚软弱地质条件下钢板桩围堰设计

发布时间：2018-04-28 23:25

  本文选题：软弱地质 + 承台　； 参考：《世界桥梁》2016年06期

【摘要】：珠海横琴二桥跨天沐河段桥型为2联3×50m预应力钢筋混凝土宽幅连续箱梁桥,该桥94号~97号墩承台地处深厚软弱地质条件,为确保钢板桩围堰支护结构的稳定及安全性,综合考虑承台结构尺寸、承台埋深、地质及水文条件后,确定采用复合地基处理与钢板桩围堰相结合的方案。钢板桩围堰平面尺寸为12.2m×11m,拉森Ⅳ型Q345B钢板桩长18m,围堰内设2道内支撑。封底混凝土面下淤泥层采用9m长水泥搅拌桩加固成复合地基。采用等值梁法对钢板桩围堰进行力学计算,并采用MIDAS Civil有限元软件建立最不利工况梁单元模型,采用容许应力法对钢板桩强度、内支撑、基坑底土抗隆起进行验算,结果均满足规范要求。
[Abstract]:In order to ensure the stability and safety of steel sheet pile cofferdam support structure, the bridge type of Tianmu River reach of Hengqin II Bridge in Zhuhai is 2 United 3 脳 50 m prestressed reinforced concrete wide width continuous box girder bridge. The cap of pier 94 ~ 97 of this bridge is located in deep soft geological conditions, in order to ensure the stability and safety of steel sheet pile cofferdam support structure. After considering the structural size of the cap, the depth of the cap, the geological and hydrological conditions, the combination of composite foundation treatment and steel sheet pile cofferdam is determined. The plane dimension of steel plate pile cofferdam is 12.2m 脳 11m, the length of Larsen 鈪，

本文编号：1817378