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针对桩身位于粉质粘土中而桩端支撑在圆砾层上的预制管桩,进行室内模型试验,研究桩端圆砾层的厚度变化对预制管桩承载力的影响及模型桩荷载作用下的侧摩阻力分布.试验结果表明:圆砾层厚度越大,桩的承载力越大;圆砾层厚度越大,桩侧摩阻力的增幅越大;圆砾层的厚度越大,预制管桩破坏时的总沉降量越小,破坏反应较厚度小者更强烈,桩侧摩阻力随桩土相对位移的增大出现极限值.
For the precast pipe pile whose pile body is in silty clay and the pile end is supported on the round gravel layer, indoor model test is carried out to study the influence of the change of the thickness of the pile-end gravel layer on the bearing capacity of the precast pipe pile and the effect of the model pile load The results show that the larger the gravel thickness is, the larger the bearing capacity of the pile is. The larger the gravel thickness is, the greater the increase of friction is. The greater the thickness of the gravel layer, The smaller the total settlement when the pile is damaged, the stronger the damage reaction is, the lower the frictional resistance of the pile with the increase of the relative displacement of the pile-soil appears.