基于可视化渗流技术的管涌机理试验研究  

EXPERIMENTAL RESEARCH ON PIPING MECHANISM BASED ON VISUAL SEEPAGE TECHNOLOGY

作　　者：曾凡玉 芮圣洁 杨华 ZENG Fanyu;RUI Shengjie;YANG Hua(College of Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《低温建筑技术》2020年第10期98-101,共4页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目(51779220);浙江省自然科学基金项目(LHZ19E090003);浙江省重点研发项目(2018C03031)。

摘　　要：文中通过自行设计管涌水槽,采用可视化渗流技术对多孔介质管涌的整个过程进行跟踪记录,从细观角度揭示了系统几何特性和水力特性的复杂变化。结果表明在多孔介质内部,管涌通道最先形成于底部,随水力梯度增大逐渐向上部扩展,最终形成贯穿通道;水槽边壁处颗粒运移速度较大,易在此处形成优势通道;在管涌临界状态和管涌通道贯通时,试样内部水压会发生骤降;临界状态下,细颗粒的运移速度一般为渗流速度的1/10。该成果揭示了管涌发生的细观机理,为管涌更深入的理论研究提供试验基础。In this paper,the piping flume was designed,and the visual seepage technology was employed to track the entire process of piping within the porous medium.The experiment reveales the complex changes of the geometric and hydraulic characteristics of the system from a meso point of view.The results show that within the porous medium,the piping channel is first formed at the bottom,and gradually expands upward with the increase of the hydraulic gradient,and finally forms a through channel.The particle migration velocity at the side wall of the flume is large.It is easy to form a preferential flow path at the side wall of the flume.In the critical state of piping and the passage of the piping channel,the pore pressure of the sample will suddenly drop.In the critical state of piping,the migration velocity of fine particles is generally 1/10 of the seepage velocity.The results reveal the mesomechanism of the occurrence of piping,and provide an experimental basis for more in-depth theoretical research.

关 键 词：养老建筑 建筑组团 组团式布局模式 北方地区 

分 类 号：TU413.9[建筑科学—岩土工程]