摘要
砾石土心墙坝初次蓄水后面临复杂的应力-渗流耦合效应,易引发心墙水力劈裂和坝基渗透失稳等风险。依托某300 m级特高砾石土心墙堆石坝工程,建立其三维饱和-非饱和渗流有限元数值分析模型,探究蓄水历时与速率对心墙坝渗流场分布规律及坝址区渗透稳定性的定量影响。研究结果表明:不同蓄水方案下,心墙防渗工作性态良好,水头削减率达90%以上;随蓄水历时增长,心墙上游渗透压力不断减小,而心墙内饱和区与孔隙水压力有所增大;随蓄水速率加快,心墙上游渗流等势线分布更加密集,心墙上游反滤层渗透坡降呈先增长后减小的变化趋势;对比不同蓄水方案,控制蓄水速率为1m/d可有效防止心墙水力劈裂。
After the initial impoundment of the gravel soil core wall dam,complex stress-seepage coupling effects arise,which may trigger risks such as hydraulic fracturing within the core wall and the seepage instability of dam foundation.Based on a 300 m high gravel soil core wall rockfill dam engineering,a three-dimensional saturated-unsaturated seepage finite element model was established to investigate the quantitative effects of impoundment duration and rate on the distribution of the seepage field of the core wall dam and the seepage stability in the dam foundation area.The results indicate that under different impoundment schemes,the core wall performs well with a head reduction rate exceeding 90%.As the impoundment duration increases,the upstream seepage pressure of core wall decreases,while the pore water pressure in the saturated zone inside core wall increases.With faster impoundment rates,the distribution of the seepage equipotential lines becomes denser upstream of the core wall,and the permeability gradient upstream of the filter layer initially increases and then decreases.Comparing different impoundment schemes,controlling the impoundment rate at 1 m/d effectively prevents hydraulic fracturing of the core wall.
作者
谭嘉蓉
沈振中
王观琪
周剑
徐超群
TAN Jiarong;SHEN Zhenzhong;WANG Guanqi;ZHOU Jian;XU Chaoqun(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210024,China;Chengdu Engineering Corporation Limited,Chengdu 610072,China)
出处
《佳木斯大学学报(自然科学版)》
2025年第7期100-104,共5页
Journal of Jiamusi University:Natural Science Edition
基金
国家自然科学基金/雅砻江联合基金项目(U1765205)。
关键词
砾石土心墙坝
初次蓄水
饱和-非饱和渗流
渗透稳定
gravel-soil core wall dam
initial impoundment
saturated-unsaturated seepage
seepage stability
