扩底楔形桩抗压承载力理论计算分析

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。

THEORETICAL ANALYSIS ON THE COMPRESSION BEARING CAPACITY OF BELLED WEDGE PILES

Belled wedge piles are an effective new type of pile which can improve side friction, pile tip resistance, and unit material bearing capacity usage; However, there are few studies focused on theoretical calculation methods of their vertical compressive bearing capacity. In small angle range (<5°), based on the Randolph & Wroth load transfer theoretical model, a calculation method for bearing capacity of belled wedge piles which considers taper angle effect was developed. The accuracy and reliability of the theoretical model was verified by comparative analysis with numerical computational model and model test results. Then, influence factors such as taper angle, enlarged pile base, and pile modulus characteristics were analyzed and discussed. The results show that the vertical compressive bearing capacity of belled wedge piles can be accurately and efficiently calculated by the theoretical method established in this paper; also, the vertical compressive bearing capacity of belled wedge piles is more obviously influenced by enlarged pile base than taper angle.