论文部分内容阅读
提出了砂土中水平受荷单桩的修正应变楔方法。从3个方面对应变楔模型进行了修正,首先假设三维被动土楔后桩身的水平位移呈非线性变化,从而使得楔形体内的水平应变不再是一常量,而是沿深度变化。其次引入了两个双曲线型的模型分别用以模拟楔形体中土体的水平应力增量-应变关系和桩-土界面处桩侧剪应力-位移关系。然后通过算例验证了修正方法的有效性,模拟结果与实测结果吻合较好。最后分析了各个修正因素对计算结果影响,结果显示,非线性位移假设的引入对原应变楔模型计算的水平承载力偏高有明显地改善,新的水平应力增量-应变关系和桩侧剪应力-位移关系的引入使得应变楔方法更加简便有效。
A modified strain wedge method for horizontally loaded single pile in sand is proposed. From three aspects of the modified wedge model was revised, first assume that the three-dimensional passive wedge after the horizontal nonlinear displacement of the pile body, so that the wedge horizontal strain is no longer a constant, but along the depth changes. Secondly, two hyperbola models are introduced to simulate the horizontal stress increment-strain relationship of the soil in the wedge body and the pile-side shear stress-displacement relationship at the pile-soil interface respectively. Then the validity of the correction method is verified by an example. The simulation results are in good agreement with the measured results. Finally, the influence of each correction factor on the calculation results is analyzed. The results show that the introduction of the nonlinear displacement hypothesis improves obviously the horizontal bearing capacity calculated by the original strain wedge model. The new horizontal stress increment-strain relationship and the pile lateral shear The introduction of stress-displacement relationship makes the strain wedge method more simple and effective.