摘要
刚性桩复合地基的承载力通常是由桩和桩间土的承载力组合而成。对于复杂地层的刚性桩复合地基,桩间土的承载力如何取值,目前规范没有给出合适的确定方法。针对该问题,根据桩土变形协调原理,计算研究上软下硬、上硬下软的分层土地基桩间土承载力的确定方法。研究表明,在复杂地层中,变形协调法能较为合理地确定桩间土承载力;对上硬下软的地基,按土层厚度加权平均各土层承载力是基本可行的,但需注意下卧软土较厚的情况;对上软下硬的地基,厚度加权平均法高估了桩间土的承载,并且当桩底持力层硬于基底土层时,取基底软土承载力也是偏高的,应取更小的桩间土承载力发挥系数β。该研究为复杂地层刚性桩复合地基桩间土承载力的确定提供了简便合理的方法。
The bearing capacity of a rigid pile composite foundation is usually a combination of the bearing capacity of the pile and the soil between the piles.For rigid-pile composite foundations in complex stratum,the current codes does not give a suitable method to determine the bearing capacity of the soil between the piles.In response to this problem,this paper,based on the principle of pile-soil deformation coordination,calculates and studies the method for determining the bearing capacity of the soil between the piles of the layered soil foundation with upper-soft and lower-hard,and upper-hard and lower-soft.Research shows that in any complex stratum,the deformation coordination method can reasonably determine the bearing capacity of the soil between piles.Besides,for the upper-hard and lower-soft foundations,it is basically feasible to weight the bearing capacity of each soil layer according to the thickness of the soil layer,but it is necessary to pay attention to the thicker underlying soft soil.However,For upper-soft and lower-hard foundations,the weighted average thickness method overestimates the bearing capacity of the soil between the piles,and when the pile bottom bearing layer is harder than the base soil,the bearing capacity of the base soft soil is also higher,and a smaller coefficient of the bearing capacity of the soil between the piles should be used.Therefore,the research results provide a simple and feasible method for determining the bearing capacity of the soil between the piles of rigid pile composite foundation in complex stratum.
作者
杨光华
周沛栋
YANG Guanghua;ZHOU Peidong(Department of Civil Engineering,South China University of Technology,Guangzhou 510640,China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;The Geotechnical Engineering Technology Center of Guangdong Province,Guangzhou 510635,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期2442-2449,共8页
Building Structure
基金
国家自然科学基金项目(52078143)
关键词
刚性桩复合地基
地基承载力
复杂地层
桩土变形协调
厚度加权平均法
rigid pile composite foundation
bearing capacity of foundation
complicated stratum
pile-soil deformation coordination
thickness-weighted average method
