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扩底楔形桩是一种可以有效发挥桩侧摩阻力和桩端承载力,提高单位材料承载力的新型桩;然而针对其竖向抗压承载力理论机理及计算方法的研究相对较少。在小倾角范围内(<5°),基于Randolph和Wroth荷载传递理论模型,建立考虑楔形角对荷载传递机理影响的扩底楔形桩桩侧摩阻力、桩端承载力计算方法;通过与数值计算模型和模型试验实测结果的对比分析,验证该文所建立的理论计算模型的准确性与可靠性;续而开展楔形角、扩大头直径以及桩体强度等因素对扩底楔形桩抗压承载力特性的影响分析。研究结果表明:该文所建立的扩底楔形桩理论计算方法可以准确、有效地计算其竖向抗压承载力;同等地质条件下,扩大头直径比楔形角对基桩竖向抗压承载力的影响更明显。
The wedged quilted pile is a new type of pile that can effectively exert pile friction and pile bearing capacity and improve bearing capacity of unit materials. However, there are relatively few studies on its theoretical mechanism and calculation method of vertical compressive bearing capacity. Based on the theoretical model of Randolph and Wroth load transfer in the small inclination range (<5 °), the calculation method of lateral friction and pile end bearing capacity of wedge-shaped piles with wedged corners considering load transfer mechanism was established. Model and model test results of the comparative analysis to verify the theoretical calculation model established in the article of the accuracy and reliability; continued wedge angle, expanding the head diameter and the strength of the pile and other factors on the wedging pile bearing capacity Impact analysis of characteristics. The results show that the calculation method of the wedge-shaped piles with enlarged base can establish the vertical compressive bearing capacity accurately and effectively. Under the same geological conditions, the vertical compressive bearing capacity The effect is more obvious.