Abstract: Seepage monitoring is an significant content of reservoir dam safety monitoring, and the result is important for guiding dam operation. Taking Xi'ni'er reservoir main dam cement soil cutoff wall section as an example, this paper analyzes the seepage of typical section 4+575 and 5+175. The results show that seepage water level and osmotic pressure at dam foundation of these two sections are high, so are dam water level and the elevation of escaping point of backfill base material downstream; horizontal seepage gradient of dam foundation at drainage ditch is relatively large, slightly less than permissible gradient of dam foundation soil but bigger than filter material's, which means potential safety hazards. The results provide important reference for guiding the safe operation of reservoir.

Key words: earth-rockfill dam, seepage analysis, cement soil cutoff wall, Xi'ni'er reservoir

摘要： 渗流监测是水库大坝安全监测的一项重要内容，其结果对于指导大坝的安全运行管理有着重要意义。以希尼尔水库主坝水泥土防渗墙段为例，对主坝典型断面4+575与5+175进行渗流分析，结果表明：上述两处断面在高库水运行期坝基渗压水位高、渗透压力较大，坝体水位及下游坝后回填清基料出逸点高程较高；排水沟处坝基水平向渗透坡降较大，稍小于坝基土体的允许渗透坡降，并超过反滤垫层料的允许渗透坡降，存在渗流安全隐患。研究结果为指导水库的安全运行提供了重要参考。

关键词: 土石坝, 渗流分析, 水泥土防渗墙, 希尼尔水库