CAJ | 학술논문

复合桩基的根本是桩土共同作用,而桩土共同作用的前提则是桩土变形协调,基桩与地基土的支承刚度通常存在数量级卜的差异,因此要使桩土的变形协调,必须要采取一定的措施.以桩土共同作用机理为根本对复合桩基的使用条件进行了探讨,指出天然地基承载力满足率小于0.5而采用复合桩基时,桩土共同作用无法形成,最终使整个建筑物的安全度降低;天然地基承载力满足率大于0.6甚至0.7时,复合桩基整体安全度虽容易满足,但整体偏于保守,另外还容易缩小复合桩基适用范围.建议复合桩基使用条件中灭然地基承载力满足率大于等于0.5即可.
복합장기적근본시장토공동작용,이장토공동작용적전제칙시장토변형협조,기장여지기토적지승강도통상존재수량급복적차이,인차요사장토적변형협조,필수요채취일정적조시.이장토공동작용궤리위근본대복합장기적사용조건진행료탐토,지출천연지기승재력만족솔소우0.5이채용복합장기시,장토공동작용무법형성,최종사정개건축물적안전도강저;천연지기승재력만족솔대우0.6심지0.7시,복합장기정체안전도수용역만족,단정체편우보수,령외환용역축소복합장기괄용범위.건의복합장기사용조건중멸연지기승재력만족솔대우등우0.5즉가.
The root of composite pile foundation is pile - soil interaction, while deformation coordination between piles and soil is the precondition of the pile - soil interaction. Larger difference of bearing stiffness of piles and soil is existent usually, so certain measures must be taken to ensure deformation coordination. This paper discussed on the application condition of composite pile foundation based on mechanism of pile - soil interaction, and concluded that when the rate of bearing capacity of natural subgrade was less than 0. 5, the composite pile foundation could not realize interaction and made the safety degree of the whole building decreased; when the rate of bearing capacity of natural subgrade was more than 0. 6 and even 0. 7, although the safety degree of composite pile foundation should be satisfied easily yet the integral safety degree was conservative, besides, it was easy to reduce the application scope of the composite pile foundation. This paper suggested that the reasonable rate of bearing capacity of natural subgrade was equal or greater than 0. 5 in application range of composite pile foundation.