巴基斯坦N-J水电站大型开关站回填施工技术

Backfilling construction technology for large-type switch station of N-J hydropower station in Pakistan

巴基斯坦N-J水电站地面500 kV开关站回填区位于Agar Nullah河右岸岸滩上,回填面积约4 hm2,土石方填筑总量约45万m3,回填压实度要求达到98%以上。结合国际工程师对大型回填区的要求,通过回填碾压试验,确定了不同回填层摊铺厚度、碾压遍数、最大干密度、最佳含水率等参数。从实际施工角度详细介绍了回填施工方法及其技术要点。

The backfilling area, with the area of about 4 hm2 and total amount of about 450 thousand m3 , for 500 kV switch station of N-J Hydropower Station in Pakistan is located on the right bank of Agar Nullah River and the compactness is required to be 98%. According to the requirement to the large backfilling area by international engineers, through backfilling and rolling test, the parameters of backfilling thickness for different layers, rolling times, the maximum dry density, the optimal water content etc. were determined. The backfilling construction method and key technological points are introduced in detail from the view of practical construction.