摘要
为准确、有效确定现代岩溶影响层深度,基于河谷三期演化分层模型,在坝基钻孔内由上至下进行分层岩溶水力联系密切程度研究,通过压水段、观测段水压力曲线的相关性,确定现代岩溶影响层深度。以红水河支流某水电站坝基岩体分层压水试验为例进行验证,结果表明:采用此方法判定的岩溶类型与钻孔揭露的岩溶发育程度相符,所提出的新方法具有较高的可靠性。研究成果可为坝基防渗处理深度提供设计依据,具有一定的指导意义。
In order to accurately and efficiently determine the depth of modern karst-influenced layers,based on the three-phase stratification model of river valley,the close degree of layered karst hydraulic connection in the borehole of the dam foundation was studied from top to bottom,and the depth of the modern karst-influenced layer was determined by the correlation of the water pressure curve of the pressurized water section and the observation section.The layered pressurized water test of the bedrock mass of a hydropower station on the tributary of Hongshui River was adopted for verification,and the results showed that the karst type determined by this method was consistent with the karst development degree revealed by the borehole,and the proposed new method was high reliable.The research result can provide a design basis for the depth of impervious treatment of dam foundation,and has certain guiding significance.
作者
陈启军
张小平
曹振中
CHEN Qijun;ZHANG Xiaoping;CAO Zhenzhong(China Water Resources Pearl River Planning,Surveying&Designing Co.,Ltd.,Guangzhou 510610,China;Institute of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541004,China)
出处
《水利水电快报》
2023年第11期52-56,84,共6页
Express Water Resources & Hydropower Information
基金
国家自然科学基金资助项目(51968015)。
关键词
覆盖型岩溶
现代岩溶影响层
坝基渗漏
水动力作用
河谷三期分层模型
overlying karst
modern karst-influenced layer
leakage of dam foundation
hydrodynamic action
three-phase hierarchical model of river valleys
