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
摘要 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。
关键词 三维有限差分法;接地电阻;短距测量;大尺寸不规则接地系统;电位分布
Abstract 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 arrangements 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.
Keywords three-dimensional finite difference method;grounding resistance;
measurement with short wire;large-scale irregular grounding system;potential
distribution
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