考虑卸荷的桩-土接触面模型研究

以多组砂土与混凝土接触面大型直剪试验为基础，对卸荷条件下接触面的力学行为进行研究，通过理论推导，建立砂土径向卸荷条件下的桩-土接触面剪切模型，给出了模型中各个参数的确定方法，并采用大型直剪试验数据对模型进行验证。结果表明:考虑卸荷的桩-土接触面剪切模型可以很好地反映试验结果，可为工程实践提供一些参考。

Study on Pile-Soil Interface Shear Model with Unloading Consideration

Based on several groups of large-scale direct shear test on contact surface between sand and concrete, the mechanical behavior on the contact surface in unloading was studied. Through theoretical derivation, the shear model of pile-soil interface in radial unloading for sand was established and the determination method of various parameters for the model was offered; then the model was validated by using the data from the large-scale direct shear tests. The result shows that the pile-soil interface shear model with unloading consideration may reflect the test result well and be referred by engineering practice.