为研究尾矿库堆积坝尾款砂密实度的变化规律,以及通过场地土卓越周期来判断库区地基土的软硬程度,根据宁城县宏达矿业2#尾矿库现场勘察的相关结果,通过一系列的原位测试数据,计算该库区场地土的卓越周期.统计整理数据可以得出尾矿堆积坝的密实度随着深度的增大而增大的结论,通过卓越周期的计算结果可以判定该库区地基土处于异常松软的土层,应加强对其安全性的管理. In order to study the variation rule of tailing sand density in tailing ponds and to determine the degree of soft soil and hard ground of soil in the reservoir area based on the soil superiority cycle, according to the related results of site investigation of Hongda Mining 2 # tailings reservoir in Ningcheng County, Through a series of in-situ test data, the remarkable cycle of soil in the reservoir area was calculated, and the statistical consolidation data showed that the density of the tailing dam increased with the increase of depth. Based on the results of excellent cycle calculation, It can be determined that the foundation soil in the reservoir area is in an unusually soft soil layer and its safety management should be strengthened.