电缆隧道中盾构接地系统接地电阻简化计算公式  

Simplified formula for calculating grounding resistance of grounding system using tunnel foundation in cable tunnel

作　　者：杜学龙[1] 仇天骄 张晓颖[2] 马学良[2] 尹凡[2] 郭健[2] 邹军[1] 

机构地区：[1]清华大学电机系,北京100084 [2]北京电力经济技术研究院,北京100055

出　　处：《电工电能新技术》2014年第11期44-49,74,共7页Advanced Technology of Electrical Engineering and Energy

摘　　要：接地电阻是接地系统安全运行的重要参数之一。本文通过仿真验证,给出了盾构接地系统(基于盾构结构的接地系统)接地电阻的简化计算公式。简化电缆隧道中盾构接地系统,建立相应的有限元仿真模型;通过仿真研究隧道中钢筋层数、钢筋个数、水泥层电导率、水泥层厚度对接地电阻的影响;根据仿真结果将求解复杂的隧道接地系统接地电阻的问题等效为求解埋地圆柱导体接地电阻的问题,并给出埋地圆柱导体接地电阻的简化计算公式。数值计算表明,简化公式计算精度满足工程要求,可用于计算电缆隧道中盾构接地系统的接地电阻。The grounding resistance is one of the important parameters for the safe operation of the grounding system in cable tunnel. Based on the simulation analysis, a simplified formula for calculating the grounding resistance of grounding system using the tunnel foundation （GSTF） is provided in this paper. Firstly, the simplified grounding system of cable tunnel is obtained and the corresponding finite element simulation model is built. Then, the influ- ence of the number of steel bar layer, the number of steel bar, the conductivity of cement layer and the thickness of cement layer on the grounding resistance is analyzed. At last, according to the simulation results, the problem that solving the grounding resistance of the complex grounding system in tunnel can be simplified to that solving the grounding resistance of the buried cylindrical conductor whose grounding resistance can be obtained easily. The re- sults indicate that the accuracy of the simplified formula can meet the needs of engineering calculation. And the ex- pression is suitable for calculating the grounding resistance of GSTF in cable tunnel.

关 键 词：电缆隧道 接地系统 接地电阻 

分 类 号：TM152[电气工程—电工理论与新技术]