摘要
物流仓储工程对地基承载力及沉降要求较高,而软土地基场地地质条件复杂,采用传统地基处理方法难以满足主体结构对地基承载力及沉降的设计要求。为此引入孔内强夯碎石桩联合CFG疏桩地基处理新技术,首先阐述了该新技术的加固原理,即通过孔内强夯碎石桩对上部软土进行处理以提高表层土地基承载力,通过CFG桩对下卧软土夹层进行处理以解决软土地基沉降过大及不均匀沉降问题。随后阐述了该新技术的工艺特点、工艺流程及操作要点。进一步以云南某物流仓储项目地基处理工程为例,该场地为上覆深厚软填土、下卧高压缩性软土夹层地基,采用孔内强夯碎石桩联合CFG疏桩地基处理新技术对该大面积仓储地坪地基进行加固处理,详细阐述了该新技术的设计及施工工艺参数,最后对复合地基现场平板载荷试验检测结果及库区地坪工后沉降监测结果进行分析,结果显示经该新技术处理后地基承载力及沉降均能得到较大改善,表明该方法具有良好的处理效果。
High requirements are needed for the bearing capacity and settlement of the foundation in logistics warehouse projects. Due to the complex geological conditions of the soft soil foundation, the traditional ground improvement method is unable to meet the design requirements for the bearing capacity and settlement of the foundation. Therefore, a new technology for foundation treatment of in-hole dynamic compaction gravel piles combined with CFG sparse piles is introduced. Firstly, the reinforcement principle of the new technology is expounded. The upper soft soil is treated by the dynamic compaction gravel pile in hole to improve the bearing capacity of surface soil foundation, and the underlying soft soil interlayer is treated with CFG piles to solve the problems of excessive and uneven settlement of soft soil foundations.Then, the construction process of the new technology is presented. Taking the foundation treatment project of a logistics warehouse project in Yunnan as an example, the site is covered with deep soft fill soil and lying on the interlayer foundation of high compressibility soft soil, the new technology of dynamic compaction gravel pile in hole combined with CFG sparse pile foundation treatment is adopted to strengthen the large-area warehouse foundation. The on-site plate load test results of the composite foundation and the monitoring settlement of the floor in the reservoir area are analyzed. The results show that the bearing capacity and settlement of the foundation can be greatly improved after treatment, indicating that the method has good treatment effect.
作者
王迎丰
曾华健
潘忱
张小莉
刘雪珠
伍翔飞
WANG Ying-feng;ZENG Hua-jian;PAN Chen;ZHANG Xiao-li;LIU Xue-zhu;WU Xiang-fei(Jiangsu Geotechnical Engineering Co.,Nanjing 210018,Jiangsu,China)
出处
《地基处理》
2022年第2期109-115,共7页
Journal of Ground Improvement
关键词
物流仓库
软土地基
孔内强夯碎石桩
CFG桩
地基处理
施工技术
logistics warehouse
soft soil foundation
dynamic compaction gravel pile in hole
CFG pile
ground improvement
construction technique
