(同济大学地下建筑与工程系，上海 200092)
［提要］对桩端周围土体的性状进行了分析，引入考虑桩端土体压缩特性双曲线函数，将桩端阻力的发挥同桩的刺入变形联系起来。采用考虑桩端土体可压缩特性的双曲线函数，对上海地区砂性端承土及现场试桩中端阻力与刺入变形关系进行了分析，结果表明模式是可行的。但在许多方面仍有不确定性，有待深入的研究。
［关键词］刺入；桩端阻力；双曲线函数；球孔扩张；压碎性
Preliminary Research on Resistance of Pile Tip Based on Penetration Displacement of Pile Base/Ye Jianzhong,Zhou Jian(Department of Geotechnical Engineering, Tongji University,Shanghai 200092,China)
Abstract:According to analysis of the behavior of sand surrounding pile tips, a hyperbolic function is presented considering the compressibility of soil around pile tip which establishes certain relation between end bearing capacity and penetration at pile base.It is verified that application of the proposed model in piles supported by typical Shanghai soils gives satisfactory results.However,there are many uncertain factors which limit the accurate determination of relationship between pile tip resistance and normalized settlement.Further research is needed for the rational evaluation of pile loadsettlement behavior.
Keywords:penetration; end bearing capacity; hyperbolic function; cavity expansion; curshability
*国家自然科学基金资助项目(50578122)。