基于有限单元法的堤坝管涌拟流场分析及试验  

Numerical Modelling and Experiment of Flow-field Fitting Method for Dam Piping Leakage Detection Based on Finite Element Method

作　　者：熊彬[1] 黄杨 陈汉波[1,2] 张天宇 梁卓 Xiong Bin;Huang Yang;Chen Hanbo;Zhang Tianyu;Liang Zhuo(College of Earth Sciences,Guilin University of Technology,Guilin Guangxi 541004,China;Institute of Urban Underground Space and Energy Studies,The Chinese University of Hong Kong(Shenzhen),Shenzhen Guangdong 440300,China;The Thiro Grological Exploration Institute,China Metallrgical Geology Bureau,Taiyuan Shanxi 030000,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]香港中文大学(深圳)城市地下空间及能源研究院,广东深圳440300 [3]中国冶金地质总局第三地质勘查院,山西太原030000

出　　处：《工程地球物理学报》2023年第3期297-303,共7页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金(编号:42174080);广西自然科学基金(编号:GXNSFGA380004)。

摘　　要：为了深入探究拟流场的电流密度响应特征,更好地服务于病险水库隐患探测和汛期堤坝查险,从分析有限元理论开始,建立不同渗漏通道模型,计算其拟流场电位进而获得电流密度的主要特征,分析不同模型对电流密度的影响。结果表明,电流密度不同分量在渗漏处附近均出现异常特征,在渗漏区域附近,电流密度x分量出现双极性异常,电流密度y分量出现单极值异常,电流密度z分量出现方向相反的异常情况,变化幅度较大。因此,为了更方便、有效地寻找渗漏通道,本文提出应当在水域底部布置若干条沿垂直于堤坝走向的测线测量电流密度z分量,通过分析电流密度z分量异常响应找到疑似渗漏点,为汛期堤防渗漏的快速排查提供理论指导。并实际应用于深圳某水库的堤防渗漏检测,圈定疑似渗漏入水口区域,经过工程验证,证实其为渗漏入水口。In order to further explore the current density response characteristics of the flow field fitting method(FFFM),better serve the hidden danger detection of the dangerous reservoir and the inspection of the dam in flood season,starting from the analysis of the finite element method(FEM)theory,different dam piping leakage models are established,and the FFFM potential is calculated to obtain the main characteristics of the current density,and the influence of different models on the current density is analyzed.Different components of current density show abnormal characteristics near the dam piping leakage area.Near the leakage area,the x component of current density show bipolar anomaly,the y component of current density showed unipolar anomaly,and the z component of current density shows abnormal situation in the opposite direction,with a large range of change.Therefore,in order to find leakage channels more conveniently and effectively,this paper proposes the measure of the z component of current density by laying several survey lines perpendicular to the trend of the dam at the bottom of the water area,and identifies the suspected piping leakage by analyzing the abnormal response of z component of current density,which provides theoretical guidance for the quick investigation of piping leakage in flood season.After delineating the suspected leakage inlet area,this method is applied to the piping leakage detection of a reservoir in Shenzhen,confirming the leakage inlet through engineering verification.

关 键 词：渗漏 拟流场法 有限单元法 电流密度 

分 类 号：TV871[水利工程—水利水电工程]