水下高耸薄墙爆破对紧邻钢管桩的动力影响  

Influence of demolition blasting of underwater towering thin wall on dynamic characteristics of adjacent steel pipe pile

作　　者：封江东 王金绪 孙晓伟[1] 黎卫超 曹昂 FENG Jiangdong;WANG Jinxu;SUN Xiaowei;LI Weichao;CAO Ang(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Science Research Institute,Wuhan 430010,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《水利水运工程学报》2023年第3期130-137,共8页Hydro-Science and Engineering

基　　金：中央财政基本科研业务费资助项目(CKSF2021461/YT)。

摘　　要：沉管隧道暗埋段对接端、预制干坞坞口的临时护岸多采用深水钢管桩-混凝土止水墙复合结构,所处环境及结构的特殊性使其难以采取机械拆除的方法,研究混凝土止水墙爆破拆除对紧邻钢管桩动力特性的影响具有现实意义。基于襄阳市某工程沉管对接端止水墙爆破拆除工程,采用欧拉-拉格朗日耦合方法建立三维精细化钢管桩-混凝土止水墙有限元模型,分析不同炮孔布置形式(桩间与桩侧布孔)下拆除爆破对钢管桩动力特性的影响。研究表明,不同布孔形式下,锁口钢管桩均不会倾倒,但桩间布孔更有利于螺栓剪断,能够达到拆除对象破碎坍塌、保留对象“断而不倒”、对周围环境“零干扰”的爆破效果。Deep-water steel pipe pile-concrete wall composite structure is often used as the temporary revetment of the buried section and dock entrance of immersed tunnel.The particularity of its environment and structure type brings in difficulties for mechanical demolition.The key to ensure the opening of the dock channel is to study the influence of the blasting demolition of concrete waterproof wall on the dynamic characteristics of adjacent steel pipe piles.Based on the blasting demolition engineering of the immersed tube butt end and dry dock gate waterproof wall in the Xiangyang East-West Axis Road Project,a coupled Eulerian-Lagrange method was used to establish the three-dimensional refined numerical model of the steel tube piles-concrete wall,and the dynamic characteristics of steel tube piles at varying blasthole positions(pile side charge holes and charge holes between piles)was analyzed.Results show that the locking steel pipe pile will not collapse under different hole layout forms,but the case with charge holes between piles is more beneficial to shearing bolts,which can achieve the blasting effects of“rupture and collapse of the demolition object”,“breaking without collapse of the retained object”,and“zero interference to the surrounding environment”.

关 键 词：沉管隧道 高耸薄墙 水下爆破 拆除爆破 钢管桩 动力特性 

分 类 号：U459[建筑科学—桥梁与隧道工程]