输电线路灌注桩基础自然接地电阻计算方法

通过理论分析,得出一种考虑了混凝土电阻率的计算输电线路灌注桩基础自然接地电阻的计算方法。利用CDEGS软件,建立杆塔基础模型,计算值与仿真值的对比结果表明,该计算方法的计算偏差在工程允许范围内。杆塔自然接地电阻利用系数主要受根开与桩长比值的影响,比值为0.5时,利用系数为0.51~0.56;比值扩大为1时,利用系数增加至0.63~0.67。

A Calculation Method about Nature Grounding Resistance of Bored Pile Foundation in Transmission Line

A simply method for calculating the natural grounding resistance considering the concrete resistivity of the bored pile foundation in the transmission line is obtained in this paper.A model is established by using CDEGS to verify the accuracy of this calculation method.And it shows that the calculation deviation is acceptable through comparing the calculated value with the simulation results.The utilization coefficient of natural grounding resistance of the tower is mainly affected by the ratio of root opening to pile length.When the ratio is 0.5,the utilization coefficient is 0.51~0.56.When the ratio is expanded to 1,the utilization coefficient increases to 0.63~0.67.