摘要
在水库大坝防渗加固效果检测中,物探方法能够实现快速、无损探测,但采用单一物探方法存在多解性,对大坝防渗加固效果和质量难以准确判断。为分析某水库大坝混凝土防渗墙和帷幕灌浆的防渗效果,开展了探地雷达和高密度电法等多种物探方法现场检测试验,试验结果表明:坝体防渗墙基本连续,无明显间断、孔洞等异常缺陷,存在1处墙体不密实和2处墙底异常渗漏现象;坝体下游侧分布有间断性低阻区域,部分坝体含水量高;输水管道与坝体之间存在接触渗漏,桩号0+200至0+300段下游侧坝体填筑质量较差,存在松散体,含水量偏高;大坝右岸坝脚与山体结合部位岩溶发育,含水量高。采用基于不同物理场特征观测和分析的综合物探检测技术,可较好地应用于大坝混凝土防渗墙和坝基帷幕灌浆防渗加固效果检测。
In the detection of dam anti-seepage treatment effect,the geophysical method can achieve rapid and non-destructive detection.However,it is difficult to make an accurate judgment on the quality of anti-seepage treatment because of the multi-solution of single geophysical method.In order to analyze the anti-seepage effect of concrete seepage presentation wall and curtain grouting of a reservoir dam,different geophysical methods such as ground penetrating radar and high-density electrical method of detection were carried.The detection test showed that the continuity of the dam cut-off wall was generally good,and there were no obvious discontinuities,holes and other abnormal defects.There were intermittent areas of low resistance on the downstream side of the dam,some of which had high water content.There were contact and leakage between the water pipeline and the dam body.The dam body downstream of the K0+200 to K0+300 section had poor filling quality,loose body,and high water content.The karst was developed with high water content between the foot of right dam and the mountain.The geophysical exploration technology can be applied to the detection of seepage prevention effect of concrete impermeable wall and dam foundation curtain grouting.
作者
马宏新
李卓
范光亚
毕朝达
蒋景东
MA Hongxin;LI Zhuo;FAN Guangya;BI Chaoda;JIANG Jingdong(Xiji Water Conseruancy Project Management Center,Xiji 756200,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Dam Safety Management Center of the Ministry of Water Resources,Nanjing 210029,China)
出处
《南水北调与水利科技》
CAS
北大核心
2019年第6期193-200,共8页
South-to-North Water Transfers and Water Science & Technology
基金
“十三五”国家重点研发计划(2017YFC0405104)~~
关键词
大坝
探地雷达
高密度电法
混凝土防渗墙
效果检测
dam
ground penetrating radar
high-density electrical method
concrete cut-off wall
effect evaluation
