Abstract: Some problems encountered in regular monitoring of internal settlement deformation of an earth-rockfill dam, such as complicated process, difficult automatic control, freezing, air entrainment and blockage of the equipment tubes. In the design and construction of safety monitoring at Hadashan earth dam, all those problems above were solved and automatic monitoring was realized by using the settlement monitoring system made by displacement transfer bar cascading vibrating string soil displacement meter. In this paper, its working principle was introduced, the uncertainty of measurement was analyzed and the application effect was presented. Further, some suggestions on improvement were advanced.

Key words: homogeneous earth dam, settlement monitoring, cascading soil displacement meter, automatic monitoring

摘要： 土石坝内部分层沉降变形的常规监测方法存在观测过程复杂、不易纳入自动化控制及设备管路易冻结、掺气、堵塞等问题。在吉林省哈达山水利枢纽工程土坝安全监测设计和施工中，利用位移传递杆串接一组振弦式土体位移计组成一套沉降变形监测系统，解决了均质土坝内部沉降变形常规监测方法存在的问题，实现了自动化监测。并总结了该监测系统的工作原理，计算分析了测量不确定度，介绍了实际应用效果，提出了在今后使用过程中的改进建议。

关键词: 均质土坝, 沉降监测, 串接土体位移计, 自动化监测