土工基础

›› 2017, Vol. 31 ›› Issue (6): 712-715.

• 工程实录 • 上一篇    下一篇

凯乐塔水电站坝基排水孔析出物成因分析

高小鱼   

  1. （中国水利水电第三工程局有限公司，西安 710032）
  • 收稿日期:2016-10-20 修回日期:2016-12-01 出版日期:2017-12-20 发布日期:2017-12-27
  • 作者简介:高小鱼（1974-），男，高级工程师，研究方向为水电工程施工。

Precipitated Gel at the Spillway Gallery at Dam of Guinea Kaleta Hydropower Station

GAO Xiaoyu   

  1. (SINOHYDRO Bureau 3 Co. Ltd., Xi’an 710032)
  • Received:2016-10-20 Revised:2016-12-01 Online:2017-12-20 Published:2017-12-27

摘要： 几内亚凯乐塔水电站自库区蓄水以来，随着渗漏水的流出，坝基排水孔孔口周围出现了胶状析出物。经现场观测取样、试验室检测分析，对廊道内析出物进行了化学成分、微观形貌观测、物相组成等分析。在论述其基本〖JP2〗特征及形成机理的基础上，分析它的来源和形成环境，指出渗漏水水质碱性化是坝基地下水和混凝土、防渗帷幕水泥结石相互作用的结果，在此基础上提出了控制坝基排水孔渗漏量可以更加有利于大坝基础安全稳定的意见和建议。〖JP〗

关键词: 坝基排水孔, 水质分析, 析出物, 潜在影响, 坝基稳定

Abstract: With the pooling of reservoir of the Kaleta Hydropower Station, the precipitated gel was found to be accumulated at the entrance of the spillway gallery near the base of the dam. The precipitated gel was sampled and laboratorial analyzed for its chemical component; microstructure and item composition. The mechanism of the precipitated material accumulation was investigated from its source and environment. It is concluded that the alkaline water seeped from the concrete dam was from the interaction of groundwater, concrete and soilcrete from the seepage slurry wall. The stability of the dam foundation can be improved by reducing the seepage at the spillway gallery.

Key words: Spillway Gallery, Water Quality Analysis, Precipitated Materials, Potential Effect, Dam Foundation Stability