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深厚软土区超长群桩有效桩长确定方法

, PP. 106-112

Keywords: 桥梁工程,超长群桩,剪切位移法,有效桩长,桩-桩相互作用,影响因素

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Abstract:

？将单桩有效桩长概念延伸至深厚软土区超长群桩基础中以确定其有效桩长。首先,引入剪切位移法推导得出群桩中各基桩桩侧摩阻力在桩周土中产生的位移场,并考虑因各桩的存在所引起的位移折减效应,建立了基于桩-桩相互作用的桩侧单位厚度土等效刚度系数表达式。在此基础上,基于荷载传递法建立了各基桩的荷载传递微分方程,并考虑超长桩的荷载传递特性,建立了群桩有效桩长与桩顶容许沉降量之间的关系式,从而得出基于沉降控制的深厚软土区超长群桩有效桩长计算方法,并通过算例验证了该方法的可行性。最后,基于该方法对影响深厚软土区超长群桩有效桩长的各主要设计参数进行了对比分析。结果表明:桩顶荷载、桩土相对刚度及桩径对群桩有效桩长的取值较为敏感,其中,群桩有效桩长随桩顶荷载、桩土相对刚度的增大而呈非线性增长,但随桩径的增大而减小;桩间距对群桩有效桩长的影响相对较小。

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