A Study of Grouting at the Bottom of the Reservoir Filled with Water

DOI Web Site

Bibliographic Information

Other Title
  • 湛水条件下での調整池底部におけるグラウチングに関する考察
  • タンスイ ジョウケン カ デ ノ チョウセイチ テイブ ニ オケル グラウチング ニ カンスル コウサツ

Search this article

Abstract

We found that the leakage from the Yashio dam reservoir which flowed along the network consisted of open fissures with high dip angles which were found in deeper areas, more than 500m in depth, via the investigation of the photos taken in the borehole or the tracer. Based on the boring core investigation and studies of the topography formation processes, we estimated that these open fissures with high dip angles were generated by hydrothermal alternation and large-scale mass rock creep at the inner wall of the caldera. At present, we are conducting the grouting at the bedrock of the bottom of the reservoir filled with water. We decided to try the grouting method, because we considered that it would be impossible to make a grout curtain at more than 500 m in depth, and we expected that the groundwater flow (velocity of fluid was about 1 cm/sec over(MAX about 4cm/sec )) would carry the grout material a long distance. We confirmed that this grouting method was very effective and that leakage was decreased by this grouting. In accordance with these studies, we are conducting the grouting at the bedrock of the bottom of the reservoir filled with water. In this paper, we will report on this situation of the grouting with an evaluation of the decrease in the leakage.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top