刚-柔性桩复合地基在曹妃甸吹填土场地的应用

The Application of Rigid-Flexible Pile Composite Foundation in Caofeidian Dredger Fill Venues

曹妃甸数字化煤炭储配基地工程的建设场地是围海造地形成的,上部为软弱且具有中等液化的吹填土地层,而拟建构筑物对地基强度和变形均要求很高,地基承载力要求达到320 kPa,变形控制要求严格。针对此种地层情况和构筑物特征,设计方案提出采用刚-柔性桩复合地基方案,结合两种工法的优势,柔性桩有效加固桩间土,消除负摩阻力和液化;而刚性桩则大幅提高承载力、控制沉降。着重介绍了该工法的设计理念、复合地基承载力和沉降计算模式,通过具体工程实例、设计方案和试验性施工情况的介绍,阐述了该工法的优点和应用。实践证明,该工法具有良好的经济和社会效益,值得在类似地区类似工程场地大规模应用。

Caofeidian coal storage and distribution of digital base project construction site is formed by land reclamation,the upper part is weak and has a moderate layer of liquefied land reclamation,and the proposed structure of the foundation of strength and deformation are demanding,the foundation bearing capacity required to achieve 320 kPa,deformation control demanding.Stratigraphy and structures for such characteristics,the design made using rigid-flexible piles composite foundation program,combining the advantages of both method,the flexible pile reinforced soil between piles effectively,eliminated negative friction resistance and liquefaction;rather rigid pile provided a substantial increase in bearing capacity and sedimentation control.This paper describes the design concept of the rigid-flexible piles composite foundation,the calculation patterns of bearing capacity and settlement,through specific examples of projects,introduce design program and experimental construction,described the advantages and applications of the method.Practice has proved that the rigid-flexible piles composite foundation has good economic and social benefits,similar projects in similar areas worthy of large-scale application.