摘要
大黑汀水库拦河坝设计采用多种降低坝基扬压力的对策,提高了大坝安全度.运行多年后,发现坝基廊道排水孔排出异物,沉积在排水沟中.实测资料与设计比较,经反馈分析,大坝上游帷幕大部分失效,渗透途径畅通,渗透水流对坝基断裂冲蚀扩大,形成化学及机械管涌.坝基与混凝土接触面未见破坏痕迹,沿坝轴线方向坝基扬压力基本合理.
In the design of the dam for Daheiting Reservoir, many countermeasures are adopted to lower the uplift pressure in the foundation for improvement of the dam safety. However, some sediments are discharged out from the drain holes arranged in the drainage gallery and settled in drain ditch after the operation for many years. With the comparison on the observed data with the design, most part of the upstream anti-seepage curtain of the dam is out of the function and seepage path is open and the breaking erosion in the foundation is enlarged by the seepage flow along with the formation of both the chemical and the mechanical pipings in accordance with the result from the feedback analysis concerned. Nevertheless, there are no damages at contact surface between the dam foundation and the concrete are found and the uplift pressure along dam axis is basically reasonable as well.
出处
《水利水电技术》
CSCD
北大核心
2005年第4期102-104,共3页
Water Resources and Hydropower Engineering
关键词
岩基
矮宽缝
混凝土重力坝
监测
分析
大黑汀水库
rock foundation
short slot
concrete gravity dam
monitoring
analysis
Daheiting Reservoir
