地基固结和再固结过程中桩基础轴力与沉降计算方法

发布时间：2018-06-21 12:30

本文选题：桩基础 + 固结　；参考：《岩土工程学报》2015年03期

【摘要】：在地基固结和液化后再固结过程中,土体会对桩基础产生负摩阻力。负摩阻力作用下桩基础的轴力和沉降常采用中性面方法计算,但事实上中性面方法的几个基本假定可能导致计算结果相对实际产生显著偏差。针对地基固结和震后再固结过程中负摩阻力引起的桩基础的轴力和沉降进行研究,采用随固结过程更新桩土摩擦力峰值的非线性温克尔地基梁方法,建立相应计算方法。该方法能够充分考虑固结过程对桩基础轴力和最终沉降的影响,并给出轴力和沉降的变化过程。与离心模型试验对比的结果显示,在采用合理的固结计算方式的基础上,该方法能够有效地计算地基固结和震后再固结过程中桩基础的轴力与沉降,对沉降的计算精度高于传统中性面方法。
[Abstract]:In the process of foundation consolidation and liquefaction, soil will produce negative friction to pile foundation. The axial force and settlement of pile foundation under negative friction are usually calculated by neutral plane method, but in fact, some basic assumptions of neutral plane method may lead to significant deviation between the calculated results and the actual situation. In this paper, the axial force and settlement of pile foundation caused by negative friction during consolidation and reconsolidation after earthquake are studied. The nonlinear Winkel beam method is used to update the peak value of friction between pile and soil with the consolidation process, and the corresponding calculation method is established. This method can fully consider the influence of consolidation process on the axial force and final settlement of pile foundation, and give the variation process of axial force and settlement. Compared with the centrifuge model test, the results show that the method can effectively calculate the axial force and settlement of the pile foundation in the process of consolidation and post-seismic consolidation on the basis of reasonable consolidation calculation method. The accuracy of settlement calculation is higher than that of traditional neutral plane method.
【作者单位】：清华大学水沙科学与水利水电工程国家重点实验室;美国加利福尼亚大学洛杉矶分校土木与环境工程系;
【基金】：国家自然科学基金项目(51038007,51079074)
【分类号】：TU473.1

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