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为探究循环往复荷载作用下层状地基中单桩-土-桩帽的共同作用,基于Mindlin板理论和层状弹性地基模型,结合层状地基中单桩的荷载传递规律,提出一种分析共同作用的方法。首先建立单桩-土-桩帽共同作用刚度矩阵,并利用循环往复荷载下土体压缩模量的衰减特性得到带台单桩的累积沉降及单桩-土-桩帽整体刚度的变化趋势,在此基础上进一步开展算例验证和参数分析。结果表明:计算结果与Butterfield的解非常一致;单桩-土-桩帽整体刚度明显大于单桩刚度,增加单桩的弹性模量可以显著地提高单桩-土-桩帽的整体刚度;当桩径确定时,桩长存在一个最优值使得整体刚度最大;而当桩的长径比大于某一值时,桩长的增加对整体刚度及桩帽的荷载分担比影响较小;循环往复荷载作用下单桩-土-桩帽的整体刚度逐渐增大,且趋于稳定值。
In order to explore the interaction of single pile-soil-pile cap in layered foundation under cyclic cyclic loading, based on Mindlin plate theory and layered elastic foundation model, combined with the law of load transfer of single pile in layered foundation, The method of action. Firstly, the joint stiffness matrix of single pile-soil-pile cap is established and the cumulative settlement of single-pile with single platform-soil-pile cap is obtained by the attenuation characteristics of compression modulus of soil under cyclic cyclic loading. On the basis of this, a further example verification and parameter analysis are carried out. The results show that the calculated results are in good agreement with the Butterfield solution. The overall stiffness of single pile-soil-pile cap is obviously larger than that of single pile. Increasing the elastic modulus of single pile can significantly increase the overall stiffness of single pile-soil- When the pile diameter is determined, there is an optimal value of the pile length to maximize the overall stiffness. When the aspect ratio of the pile is larger than a certain value, the increase of the pile length has less effect on the overall stiffness and load sharing ratio of the pile cap. The overall stiffness of single pile-soil-pile cap increases gradually under the load and tends to a stable value.