接地电阻随季节及天气过程变化规律分析

Grounding resistance variation of frame building with the seasons and weather process

为了解框架结构建筑物基础接地电阻的季节变化特征及天气过程对其变化的影响,分析了2010年广州从化气象局框架建筑物基础接地电阻和相关气象要素的自动气象站观测资料。从季节变化特征来看,框架结构接地电阻相对较为稳定,月平均值2月最大为0.78Ω,9月份最小为0.57Ω,全年变化最大值约为0.21Ω。统计季节变化曲线和暴雨过程发现,接地体电阻与1.5 m土壤温度和1.0 m土壤含水量呈现明显的负相关,接地电阻减小值与暴雨的强度无明显的相关性。文中还对较长时间无降水的干旱过程进行了分析,结果表明:干旱时框架结构接地电阻值有明显的上升趋势,尤其在夏季,干旱对接地电阻影响较大。

In order to understand the characteristics of frame building grounding resistance affected by seasons and weather process, this paper analyzes the grounding resistance and the related meteorologi- cal elements from automatic weather observation in 2010 in Conghua, Guangzhou. According to the char- acteristics of seasons variation, minimum grounding resistance is 0.57 1Ω in Sep. , while the maximum is 0. 78 Ω in Feb. and the annual variation maximum value is about 0.21 Ω, which means the grounding resistance of frame building is relatively stable. Based on the seasonal variation curve and rainstorm process, a negative correlation among grounding resistance, 1.5 m soil temperature and 1. 0m soil mois- ture is found out. The reduction value of grounding resistance has no obvious correlation with rainstorm intensity. An analysis on a long-time draught is also made in this paper, whose result shows that the grounding resistance has an upward trend, especially in summer.