螺旋挤土桩钻头优化分析

短螺旋挤土灌注桩以其承载力高、施工速度快、对施工场地无污染等特征，在欧美日等多国得到了广泛应用。首先基于通用非线性有限元软件ADINA，对螺旋挤土桩钻头进行钻进成孔过程的三维有限元建模，研究钻头型式、螺距、土体等参数在同等条件下对钻机动力头输出扭矩的影响。然后通过模型钻头的钻进成孔模拟试验对螺旋挤土桩钻头进一步分析，以期得到所需成孔扭矩最小的优化钻头。最后经过短螺旋挤土灌注桩的现场成孔试验验证了数值仿真和模型试验结果的正确性。所得结论为螺旋挤土桩钻头的优化设计提供依据。

Optimization Analysis on Drill Auger of Soil Displacement Screw Pile

Due to the high bearing capacity, high production rate of installation and no spoil on site, such soil displacement screw pile has been widely applied in many countries. Firstly, based on ADINA, a 3D auger-soil FEM model was developed to study the impact of pattern of the drill auger, screw-pitch and the soil parameter on the required torque. Secondly, the model tests of auger squeezing into cement-soil mixture were done to get the optimized drill auger with least torque. At last, on-site test result of drill auger squeezed into ground verified the correctness of the numerical analysis and model test. The conclusions in this paper can provide a basis for optimal design of drill auger. analysis and model test. The conclusions in this paper can provide a basis for optimal design of drill auger.