中派河特大桥大直径实心桩轴力测试试验研究

Experimental study of large diameter solid pile axial force testing on Zhongpai River Grand Bridge

基于中派河特大桥实例工程,对大直径实心桩和空心桩的适用性进行了对比分析,从而为工程桩基选型提供合理建议,通过对大直径实心桩轴力试验研究,确定了在施工过程中,桩身不同位置的桩身轴力、桩侧摩阻力及桩端阻力的分布情况,验证了大直径实心桩荷载传递机理。研究表明:大直径实心桩更适用于该工程,施工期间大直径实心桩轴力随深度逐渐增加,由自重应力分布所决定,在试验过程中,其轴力与变形处于安全状态,设计安全可靠。

Based on the example project of Zhongpai River Grand Bridge,the applicability of large diameter solid pile and hollow pile is compared and analyzed,so as to provide reasonable suggestions on the selection of pile foundation for the project.Through the axial force test study of large diameter solid pile,in order to determine the distribution of pile axial force,pile side friction resistance and pile end resistance at different locations of the pile during the construction process,the load transfer mechanism of large diameter solid pile is verified.The study shows that the large diameter solid pile is more suitable for this project,and the axial force of large diameter solid pile increases gradually with depth during construction,which is determined by the distribution of self-weight stress,and its axial force and deformation are in a safe state during the test.