施工技术 2012年12月下 26 CONSTRUCTION TECHNOLOGY 第41卷第379期 深厚软土地基沉井围护结构设计与施工 肖策 (天津二十冶建设有限公司，天津300301) [摘要]珠海横琴新区A号路污水泵站坐落在在深厚淤泥质地区，由于地基承载力和井壁侧摩阻力不足，常规大开 挖施工、地下连续墙施工和逆作法施工非常困难.采用石灰粉喷桩和高压旋喷桩加固软土地基，提高地基承载力 后进行沉井施工，工程质量和安全得到有力保证，顺利按工期要求完成沉井施工作业. [关键词]沉井；深厚淤泥；高压旋喷桩；石灰粉粉喷桩；承载力 [中图分类号]TU753.64 [文献标识码]A [文章编号]1002-8498(2012)24-0026-04 Design and Construction of Open Caisson Enclosure Structure in Deep Soft Soil Condition Xiao Ce The 20th Metallurgy Construction Company of Tianjin Tianjin 300301 China) Abstract:The sewage pumping station in Road A of Hengqin New City Zhuhai is situated in deep soft soil area.Because of poor load capacity of the earth and insufficient side friction along the sidewall of open caisson wells it is difficult to adopt the normal construction methods of big excavation underground diaphragm and up-down construction.During open caisson construction the soft soil earth was reinforced by lime dry jet mixing piles and high pressure jet grouting piles to improve its load capacity.The open caisson construction was pleted within the scheduled construction time with.The construction method also insures the engineering quality and safety. Key words:open caisson;deep silt;high pressure jet grouting pile;lime dry jet mixing pile; bearing capacity 1工程概况 沉积的流塑状淤泥.软土（地层代号③，，③）层厚 珠海横琴新区A号路污水泵站位于拟建环岛度11~13.6m 具有高含水量、高压缩性、大孔隙比、 北路AK3180南侧，地基处理面积约为 高灵敏度、低强度等特性，具流变、触变特征，淤泥 1663.2m2.场地地基大部分采用CFG桩进行软基 砂层厚0.5-1.0m;黏土、砾质性黏土层厚1.2~ 处理，设计桩身混凝土强度等级为C15 呈正三角形 2.8m.对工程建设不利的软弱土层，易导致基础沉 布置，间...
深厚软土地基沉井围护结构设计与施工.pdf
