测量U形建筑基础接地电阻的有限差分分析

Finite-Difference Analysis under the Grounding Resistance Measurement of an U-shape Building Base

运用三维有限差分法,模拟运用短距回路电极引线测量U形钢筋混凝土建筑浅基础的工频接地电阻时,在不同布极方式下的地面电位分布,分析指出运用直线-三极法时,常用40 m回路电极引线测量U形建筑基础接地电阻的合理测量点及布线方向。研究结果深化了对大尺度不规则接地系统进行短距接地电阻测量的理论认识,对U形建筑基础接地电阻的常规短距检测具有重要的工程应用指导意义。

Three-dimensional finite difference method （3D FDM）is adopted to simulate ground potential distributions when testing the power-frequency grounding resistance around an U-shape building reinforced concrete shallow base with short loop-electrode wires under different measurement arrangements. Meanwhile, the reasonable measurement points and measurement electrodes arrange- ments of testing U-shape base＇s grounding resistance with 40 m long loop-electrode wires used usually in the straight-line-three-probes method are also presented. The research results have deepened the theoretical cognition of grounding resistance measurement with short wires for large-scale irregular grounding systems and offered an important directive significance in engineering applications of routine grounding resistance measurement with short wires for U-shape building base.