临水船闸基坑水泥土搅拌桩施工对围堰的影响  

Influence of cement soil mixing pile construction on cofferdam of ship lock foundation pit adjacent to water

作　　者：武坤鹏[1,2,3] 周红星 陈胜[1,2,3] 梁小丛 WU Kun-peng;ZHOU Hong-xing;CHEN Sheng;LIANG Xiao-cong(CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510230,China;Key Laboratory of Environment Protection&Safety of Transportation Foundation Engineering of CCCC,Guangzhou 510230,China;Southern Marin Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China)

机构地区：[1]中交四航工程研究院有限公司,广东广州510230 [2]中交交通基础工程环保与安全重点实验室,广东广州510230 [3]南方海洋科学与工程广东省实验室,广东珠海519000

出　　处：《水运工程》2021年第2期188-194,204,共8页Port & Waterway Engineering

摘　　要：临水船闸基坑由于需要提供坑内较大作业空间而较多地采用重力式水泥土搅拌桩作为支护结构,基坑外侧常采用钢板桩作为临时的挡水围堰。针对水泥土搅拌桩施工过程对钢板桩围堰产生位移过大的问题,以某船闸基坑为例,采用数值模拟与现场监测数据相结合的方法研究搅拌桩施工过程中对于钢板桩临时围堰的影响,分析钢板桩围堰变形过大的原因。通过现场孔隙水压力试验得出搅拌桩施工过程中土体孔压在深度和宽度上的变化规律和水泥土搅拌桩施工对周围土体的影响范围,并提出一种钢板桩围堰变形过大的解决方案。本研究可为类似基坑的设计和施工提供借鉴。Due to the need to provide a larger working space in the pit of the ship lock near the water,the cement mixing pile is often used as the supporting structure.Steel sheet piles are mostly used as temporary water-retaining cofferdams outside the foundation pit.Taking the foundation pit of a ship lock as an example,we analyze the influence of temporary mixing cofferdams on steel sheet piles during the construction of cement mixing,and obtain the variation law of soil pore pressure during the construction of mixing piles through the field pore water pressure test,based on which a solution for excessive deformation of the cofferdam is proposed.According to the field pore water pressure test,we obtain the variation law of soil pore pressure in the depth and width of the mixing pile construction process and the influence range of the cement soil mixing pile construction on the surrounding,and propose a solution for the excessive deformation of steel sheet pile cofferdam.This study can provide a reference for the design and construction of similar foundation pits.

关 键 词：水泥搅拌桩施工 临水基坑 超孔隙水压力 环境影响 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程]