汾河二库坝基深层抗滑稳定性评价

Evaluation of the Deep Stability against Sliding of the Dam Base of Fenhe No.2 Reservoir

汾河二库拦河大坝为全断面碾压混凝土重力坝,最大坝高88m。坝基在上覆26m～28m厚砂卵石层被挖除后,通过探井、岩芯钻孔取样及超声波测试发现坝基下伏缓倾薄弱层,这将降低大坝的抗滑稳定性。为此,对坝基采取加设齿槽等工程措施,经过对坝基深层抗滑稳定进行的核算和评价,认为大坝处于稳定状态。

The Barrage of Fenhe No.2 Reservoir is a Full section rolled concrete gravity dam, the biggest height of the dam is 88 m, after the sand-boulder bed with the thickness of 26 m-28 m above the dam base was excavated, and through the exploratory excavating, the core hole sampling and the ultrasonic testing, people found the low-angle weak layer under the dam base, which will reduce the dam＇s stability against sliding. Therefore, some engineering measures such as using the extra gullet for the dam were adopted, and through the calculation and evaluation for the dam base＇s deep stability against sliding, the dam is in the stable condition.