大藤峡水利枢纽二期围堰截流研究

Damming of phase-Ⅱ weir of Datengxia Dam and key technologies for long-term operation under high water levels

大藤峡水利枢纽二期深水围堰截流具有流量大、龙口段河床深切、截流抛填工程量大的特点,技术问题复杂。通过水工模型、数值模拟以及现场试验等手段进行研究验证和探讨,模拟截流抛填过程中出现的各种不利条件,同时针对堰体不同抛填料及级配特征曲线,开展堰体填筑料与塑性混凝土防渗墙接触界面大型剪切试验,确定其接触特性参数。通过研究分析,采用合理的工程措施,为截流设计提供依据以确保截流成功。

The damming of Deep Water Cofferdam in the second phase of Datengxia Project faces a lot of technical difficulties,such as big flow,deep river bed and large quantity of earth filling.In order to simulate various kinds of unfavorable conditions that might be appeared during earth filling of damming process,testing were conducted by hydraulic model,numerical simulation and field test.Regarding different fill materials and grading characteristic curve of weir body,large scale shear test was adopted for contact interface of filling material and plastic concrete anti-seepage walls,which defined the contact parameter.The study provides evidence for damming design and ensure success of damming process.