基于柔性石墨接地体的塔基外敷降阻研究

为了降低特高压杆塔基础的自然接地电阻，本文提出在混凝土外包裹一根柔性石墨接地体，研究分析接地体的降阻效果。首先对单根灌注桩进行等值简化处理；然后在CDEGS软件中建立了特高压杆塔基础仿真计算模型，分别对螺旋式、分层式以及笼式3种敷设方法在不同土壤电阻率的情况下的杆塔基础接地电阻进行仿真计算，分析对比了不同敷设方式的降阻效果。研究表明:3种敷设方法都有显著的降阻效果，其中在同等的外界条件下，笼式的敷设方法降阻效果要优于其他2种。

Tower Foundation Resistance Reduction by External Application Based on Flexible Graphite Grounding Body

In order to reduce the natural grounding resistance of ultra-high voltage tower foundation，a flexible graphite grounding body is wrapped outside concrete to study and analyze the resistance reduction effect of the grounding body. Firstly， equivalent simplified treatment of single cast-in-place pile is carried out. Then， the simulation model of ultra-high voltage tower foundation is established in CDEGS software. The ground resistance of screw， layered and cage laying methods of tower foundation are simulated under the condition of different soil resistivity，and the resistance reduction effect of different laying methods is analyzed and compared. The results showed that all three laying methods have significant drag reduction effect， among which， under the same external conditions， the layered laying method has better drag reduction effect than the other two methods.