摘要
虹吸排水联合堆载固结技术是软基处理中的一项新技术,在应用该技术时,虹吸管内土柱的淤堵问题是制约该技术发展的核心问题之一。针对虹吸管内土柱的淤堵问题,采用颗粒沉降模型和水动力学相关理论,推导得到了土柱在虹吸水流作用下的临界高度表达式。根据所推求的表达式,可以制定相应的防淤堵措施,使得虹吸排水能够顺利进行。研究结果表明:土柱容易在虹吸管弯曲圆弧段形成淤堵;对于工程现场最常见的4mm内径虹吸管,当虹吸管弯曲圆弧段半径大于40cm或者虹吸管内土柱高度大于4cm时,就有可能产生淤堵;实际工程中,可以采用减小虹吸管弯曲圆弧段半径、降低虹吸管出水口高度以及减小虹吸管长度的措施减小淤堵的可能,从而保证虹吸过程的持续进行。
Siphon drainage combined with surcharge loading is a new technology for soft ground improvement,in which the clogging issue of soil column in siphon flow is critical. The results show that the clay column is prone to form a blockage in the curved section of the siphon tube. Siphon tubes with inner diameter of 4 mm are widely used in field engineering. When the radius of the curved section is greater than 40 cm and the height of the clay column is greater than 4 cm, the clay column will clog in the siphon tube. Aiming at the clogging problem,the critical height solution of clay column under siphon flow is derived by using the particle subsidence model and corresponding hydrodynamic theory. According to the above solution, the anti-clogging measures are proposed to guarantee the siphon drainage operate smoothly. In practice, the siphon drainage process can be maintained by reducing the radius of curved sections, the length of siphon tubes, and the height of siphon outlets.
作者
吴纲
谢威
严鑫
翁杨
孙红月
Wu Gang;Xie Wei;Yan Xin;Weng Yang;Sun Hongyue(Ocean College,Zhejiang University,Zhoushan 316021,Zhejiang,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2019年第5期1398-1404,共7页
Journal of Jilin University：Earth Science Edition
基金
浙江省重点研发计划项目(2017C03006)~~
关键词
虹吸
运动特性
土柱
淤堵
siphon
motion characteristic
clay column
clogging
