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基于安全性和耐久性考虑,超长桩的使用越来越多,因此,应尽快解决根据建筑物的使用功能正确合理的估计桩长的问题。从桩土界面非线性特点和桩土共同作用分析出发,推导了侧阻力分布与有效桩长的解析表达式。以3种典型岩土的参数取值为例,分析了实心超长桩和空心超长桩承载性能的区别,研究了不同土体内超长桩单位体积承载力问题,为大量使用超长桩基础设计提供有益的参考。
Due to the safety and durability considerations, the use of extra-long piles is more and more. Therefore, the correct and reasonable estimation of the length of piles based on the functions of the buildings should be solved as soon as possible. Based on the nonlinear characteristics of pile-soil interface and the interaction between pile and soil, an analytical expression of lateral resistance distribution and effective pile length is deduced. Taking the typical values of three kinds of rock and soil as an example, the difference of bearing capacity of solid super-long pile and hollow super-long pile is analyzed. The problem of unit bearing capacity of extra long pile in different soil is studied. Design provides a useful reference.