为优化码头陆域堆场地基加固处理方案,以长江中下游右岸某大型散货码头堆场地基加固处理为研究对象,根据工程区域地质条件、地坑皮带机廊道基础荷载、堆场承载力,以及地基处理沉降和位移的要求,参照《水运工程地基设计规范》(JTS147—2017),结合不同桩型特点,两条地坑皮带机廊道之间的散货堆料区(A区)的地基处理采用PHC管桩法与CFG桩法进行比选,其他散货堆料区(B区)地基处理采用水泥土搅拌桩法与碎石桩法进行比选。运用GEO5-岩土工程有限元软件,计算上述4种地基处理不同组合方案下不同运行工况条件(满载、偏载)的地基变形量(沉降量和水平位移),综合考虑工程经济性和施工工期等,确定A区的地基采用CFG桩、其他散货堆料区域地基采用碎石桩。计算结果表明:采用这一组合方案进行地基处理后,A区地基沉降<100 mm、水平位移<10 mm,满足《建筑地基基础设计规范》(GB 50007—2011)要求;B区最大地基沉降为458.6 mm,地基最大水平位移为102.6 mm,满足《港口道路与堆场设计规范》(JTS 168—2017)要求。研究成果可为优化大型散货码头陆域堆场地基处理设计方案提供可靠依据。

The aim of this research is to optimize the foundation reinforcement of a large bulk cargo wharf storage yard on the right bank of the middle and lower reaches of the Yangtze River. With reference to the Code for Design of Water Transport Engineering Foundation (JTS 147—2017), the treatment scheme comprehensively considers the geological conditions of the project area, the foundation load of the belt conveyor corridor, the bearing capacity of the bulk cargo stockpiling area and the requirements of settlement and displacement of foundation treatment. PHC(Prestressed High-intensity Concrete) pipe method and CFG(Cement Fly-ash Gravel) pile method were adopted for comparison for the foundation treatment between two pit belt conveyor corridors (area A), and cement soil mixing pile method and gravel pile method for other areas (area B). Geotechnical software GEO5 was used to calculate the foundation deformation (settlement and horizontal displacement) in different operating conditions (full load and partial load) under different combinations of the above four treatment methods. With the engineering economy and construction period taken into consideration, an optimal scheme with CFG pile for area A and gravel pile method for area B was determined. After the optimal scheme was adopted for foundation treatment, the foundation settlement in area A is less than 100 mm, and the horizontal displacement smaller than 10 mm,which meets the requirements of Code for Design of Building Foundation(GB 50007—2011); the maximum foundation settlement of area B is 458.6 mm, and the maximum horizontal displacement 102.6 mm, which fulfills the requirements of Design Code of Road and Storage Yard for Port Area (JTS 168—2017). The research result provides a reliable basis for optimizing the design scheme of foundation treatment of storage yard in large bulk cargo wharf.