摘要
为准确模拟渗漏病险发生条件下土石堤坝渗流特性,研制一种土石堤坝渗漏病险试验装置。该装置能够精准控制试验槽坡度、输水流量、库水温度等试验变量,可实现边壁及底板平整度的自动校核、流控系统与温控系统的自动化控制、多种供吸水组合方式的水循环、库水的分级与线性升温和降温、坝体温度场和体积变形以及孔隙水压力的动态监测等功能。选用黏土心墙堆石坝为研究对象,初步开展了土石堤坝渗漏病险试验研究。研究表明:渗漏病险区将改变坝体的流热双场,其周围的温度变幅大于孔压变幅;随着渗漏病险区逐步下移,所在位置处的温度值显著增大,浸润线的波动情况与坝体渗流速率也随之增大,影响坝体渗流稳定性的不利情况逐渐增强。该装置能够准确模拟各工况真实情况以及多场耦合效应对土石堤坝渗漏病险发生发展过程的影响,能够实时监测渗漏病险发展过程中各物理场演变情况,为深入研究土石堤坝渗流特性提供一种有效的技术工具。
To accurately simulate the seepage characteristics of earth-rockfill dams during leakage,a test device is developed.The device can precisely control the test variables such as platform slope,water supply discharge,water temperature,etc.The device can realize the automatic check of the flatness of the side wall and the bottom plate,the automatic control of the flow control system and the temperature control system,the water circulation of various water supply and suction combinations,and piecewise or linear temperature rise and drop control of the upstream reservoir water,dynamic monitoring of dam body temperature field,volume deformation and pore water pressure.A clay core wall rockfill dam is selected as the research object,and the leakage tests on earth-rockfill dams are conducted.The results show that the leakage will change the seepage field and temperature field of the dam body,causing the surrounding temperature value to change significantly.With the gradual downward movement of the leakage area,the temperature value at the location increases significantly,the fluctuation of the saturation line and the seepage rate of the dam also increase,and the adverse conditions affecting the seepage stability of the dam body gradually increase.The test device can accurately simulate the real situation of various working conditions and the influences of multiphysics coupling effects on the leakage occurrence and development process of earth-rockfill dams,and it can monitor the evolution of various physical fields in the leakage development process in real time,providing an effective technical tool for the in-depth study on the seepage characteristics of earth-rockfill dams.
作者
马朝阳
任杰
南胜豪
徐松
MA Zhaoyang;REN Jie;NAN Shenghao;XU Song(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi′an University of Technology,Xi′an 710048,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2023年第11期2268-2277,共10页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(52379134)
陕西省科技创新团队项目(2022TD-01)
水利部水库大坝安全重点实验室开放基金项目(YK323001)。
关键词
土石堤坝
渗漏
试验装置
试验方法
温度场
渗流场
earth-rockfill dam
leakage
test device
test method
temperature field
seepage field
