基于Novak薄层法的部分埋入式单桩的扭转振动

在Novak平面假定的基础上将土体视为由无穷多带一圆孔的薄的土层组成,求得等效Winkler扭转弹簧-阻尼器的刚度系数和阻尼系数,在此基础上建立了部分埋入式单桩埋入部分和外露部分桩基的扭转振动微分方程,利用部分埋入式单桩的连续条件和边界条件求解了部分埋入式单桩的扭转振动。部分埋入式单桩的扭转振动与完全埋入式单桩一样都存在有共振现象,当外露部分桩长减小时部分埋入式单桩的扭转振动可以退化到完全埋入式单桩的情况,土体剪切模量越大,土体对桩基的扭转作用越大。

Torsional vibration of partially embedded single pile based on method of novak thin layer

The soil is treated by composing of infinite thin soil layer with a round hole on the based of Novak plane assumptions, and the stiffness and damping coefficient of equivalent Winkler torsion spring-damper is got, and then,the torsional dynamic diffident equations of embedded pile and exposed pile are established, by considering the continuity conditions and boundary conditions of embedded pile and exposed pile ,the torsional vibration of partially embedded single pile is solved. The research indicates that the torsional vibration partially embedded pile has resonance phenomenon like fully embedded pile,and the tresional vibration of partially embedded pile can be reduced to the case of fully embedded pile when the length of exposed pile reduced, and the torsional effect of soil to pile will be larger when the modulus of soil increases.