水下深层水泥搅拌桩在直立式防波堤深厚软土地基加固中的应用

Application of underwater deep cement mixing pile in deep soft foundation improvement of vertical breakwater

针对直立式防波堤下深厚软土地基可能产生的沉降较大和失稳问题,依托某场地软土深厚的直立式防波堤工程,结合自然条件、结构安全使用要求及造价和工期限制,对地基处理方式选取、水泥搅拌桩的布置形式、桩径、置换率、处理深度及施工技术要点进行论述。采用理论分析与工程经验结合的方法,得出在合理控制各关键参数和采取合适的措施提高施工质量的前提下,直立式防波堤下深厚软土地基采用支撑型格栅状小直径水泥搅拌桩结合柔性垫层的处理方式是可行且相对经济、合理的。

In response to the potential large settlement and instability issues of deep soft soil foundation under the vertical breakwater,based on a certain vertical breakwater project with deep soft soil ground,combined with natural conditions,structural safety requirements,cost and construction period limitations,we discuss the selection of foundation treatment methods,the layout,pile diameter,replacement rate,depth of the cement mixing pile,and construction technology key points.By the method of combining theoretical analysis with engineering experience,it is concluded that under the premise of reasonable control of key parameters and taking appropriate measures to improve construction quality,the improvement method of supporting grid-shaped small-diameter cement mixing piles combined with flexible cushion layers is feasible and relatively economically reasonable for the deep soft soil foundation under the vertical breakwater.