基于三维扫描技术的桩-土注浆界面精细化模型重构与三维有限元数值分析

Model Reconstruction and FEM Analysis of Grouted Pile-soil Interfaces Based on 3D Laser Scanning Technology

以节能环保型大直径随钻跟管桩基础为工程背景,运用高精度三维激光扫描技术,获得随钻跟管桩的桩-土注浆界面三维点云坐标信息,建立随钻跟管桩的桩-土注浆界面三维精细化模型重构,并基于通用有限元软件Midas,开展了剪切试验数值分析,以揭示随钻跟管桩-土注浆界面在不同位置处的构造特点与剪切特性。结果表明:采用三维扫描技术能得到注浆界面的几何构造特征,以及注浆界面的粗糙度分布规律,并且通过三维扫描技术得到的点云数据转化为有限元模型进行力学性能分析是可行的;该技术方法为桩基精细的承载机理分析提供了有效手段。研究成果也可为深入研究桩-土注浆界面的粗糙度定量表征提供新思路。

Taking the large diameter drilling with pre-stressed concrete pile cased(DPC)piles as an engineering example,the grouted pile-soil interface model corresponding to DPC piles is reconstructed based on 3D laser scanning technology.The obtained interface model of DPC piles is imported into Midas software for revealing the shear characteristics of pile-soil interface at different locations.Numerical results showed that the geometric characteristics and shear behavior at the grouted pile-soil interfaces can be reconstructed and modeled comprehensively using the 3D laser scanning technology.It is feasible to analyze the mechanical properties of the finite element grouted interface using the data obtained from the 3D laser scanning technology.The proposed technical schemes are helpful for more detailed analysis of the bearing mechanism and numerical calculation of the pile foundation embedded in the soil.In addition,research results also provide a new idea for the further study of the quantitative characterization of the roughness at the grouted pile-soil interface.