工字形混凝土芯复合水泥土桩竖向承载特性分析

ANALYSIS ON VERTICAL BEARING CHARACTERISTICS OF I-SHAPED CONCRETE CORE COMPOSITE CEMENT-SOIL PILE

混凝土芯复合水泥土桩是由水泥土桩和钢筋混凝土桩组合而成的新型复合桩。结合一工程实例,以工字形异型桩作为芯桩组成工字形混凝土芯复合水泥土桩进行有限元数值模拟,探讨了工字形混凝土芯复合水泥土桩在不同芯桩长度下桩顶沉降、工字形混凝土芯桩应力分布规律及工字形混凝土芯桩与水泥土桩的荷载承担比。结果表明,随着工字形混凝土芯桩长度的增加,工字形混凝土芯桩应力沿深度逐渐减小,并出现应力集中,最大应力值出现在芯桩桩顶以下;芯桩与水泥土桩桩端荷载承担比随工字形芯长度的增加而增大,工字形混凝土芯桩承担绝大部分的桩顶荷载;芯桩的存在增加工字形混凝土芯复合水泥土桩的整体刚度,有效的减少了桩顶沉降、提高了桩基承载力。

Concrete-core composite cement-soil pile is made up by cement-soil pile and concrete pile as a new type of composite pile type.Combined with an engineering example the finite element numerical simulation of the,I-shaped reinforced concrete pile as a core of I-shaped reinforced concretecore cement-soil pile is carried out. This paper discusses the I-shaped reinforced concrete-core cement-soil pile in the pile top settlement under different core pile length and I-shaped reinforced concrete pile stress distribution rule and load sharing ratio of I-shaped reinforce concrete core pile and cement-soil pile.The results showed that with the I-shaped reinforced concrete pile length increases,the stress of the I-shaped concrete core pile gradually decreases along the depth. I-shaped reinforced concrete pile appear stress concentration, maximum stress appears at the top of the core pile around 1m range;Core pile and cement-soil pile end load than increases with increasing the length of I-shaped reinforced concrete pile;I-shaped reinforced concrete pile bear most of the pile top load;The existence of the core pile increase overall stiffness of I-shaped reinforced concrete pile, effectively reduce the settlement of pile top and improve the bearing capacity of pile foundation.