有孔管桩单桩承载性状有限元分析
Finite element analysis of bearing capacity test of single pipe-pile with hole

摘要 桩身开孔会影响管桩承载力性状，削弱桩身承载力.为研究桩身开孔对管桩承载性状的影响，采用三维有限单元法，得到了静载试验下有孔管桩单桩桩身响应，监测了无孔管桩和3种不同对称布孔方式的有孔管桩竖向荷载作用下桩顶沉降量和桩身应力，分析了有孔管桩桩顶沉降、桩身轴力及桩侧摩阻力分布等规律，并与无孔管桩进行对比.最后分析对比了有孔管桩单桩室内模型静载试验，结果与数值模拟结果，发现两者基本吻合.桩壁开孔方式将影响桩顶的沉降量及桩身轴力分布，按照星状布孔的方式在桩壁开孔是桩壁开孔位置的最优分布方式.
Abstract：The existence of holes in pipe-piles will affect the bearing capacity of pipe-piles and weaken the bearing capacity of pile body. In order to study the effect of holes on the bearing behavior of pipe-piles, the response of single perforated pipe-pile under static load test is obtained using the three-dimensional finite element method. The settlement of the top of intact and perforated pipe-piles containing different symmetrical holes under the vertical load, as well as the stress in pile body, are monitored. The settlement of pile top, the distribution of axial force and frictional resistance on the side of pipe-pile with holes are analysed, and the comparison with the pipe-pile without hole is made. Finally, the comparison between static load tests of a single pile and numerical simulation is carried out, and it is found that the numerical simulation results are basically consistent with the model test results. The way of pile opening will affect the settlement of pile top, the distribution of axial force on the side of pipe-pile, and the best distributed mode of holes is to make radial holes on the wall of pipe-pile.