| 渗流方向对红黏土与砂接触流失影响的试验研究 |
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| 引用本文： | 郑咏琎,陈群,王卓,王琛,周成.渗流方向对红黏土与砂接触流失影响的试验研究[J].中国农村水利水电,2020(1):160-163,168. |
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| 作者姓名： | 郑咏琎 陈群 王卓 王琛 周成 |
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| 作者单位： | 四川大学水利水电学院水力学与山区河流开发保护国家重点实验室;中国中铁二院工程集团有限责任公司 |
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| 摘 要： | 为了研究红黏土心墙和反滤层的接触流失破坏,采用ST 30-3渗透仪进行了不同干密度的红黏土和反滤砂层在三种水流方向情况下的接触流失破坏试验,探讨接触流失的发生和发展过程,得出了渗透流速和渗透系数随水力坡降的变化规律,以及水流方向和红黏土干密度对接触流失破坏的影响规律。试验结果表明,接触流失的发展过程依次分为稳定阶段、过渡阶段、次生反滤层形成阶段和破坏阶段。随着水力坡降的增大,渗透系数先维持不变或微增,达到启动坡降后明显增大,在次生反滤层形成阶段又趋于稳定,达到破坏坡降后突然增大。红黏土干密度的增大和水流方向与接触面夹角的减小都有助于提高红黏土和砂抵抗接触流失破坏的能力。
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| 关 键 词： | 红黏土 接触流失 水流方向 干密度 |
Experimental Research on the Influence of Seepage Direction on the Contact Loss of Laterite and Sand |
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| ZHENG Yong-jin,CHEN Qun,WANG Zhuo,WANG Chen,ZHOU Cheng.Experimental Research on the Influence of Seepage Direction on the Contact Loss of Laterite and Sand[J].China Rural Water and Hydropower,2020(1):160-163,168. |
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| Authors: | ZHENG Yong-jin CHEN Qun WANG Zhuo WANG Chen ZHOU Cheng |
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| Institution: | (State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China;China Railway Eryuan Engineering Group Co.Ltd,Chengdu 610031,China) |
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| Abstract: | In order to study the contact loss of the laterite core wall and the filter,ST30-3 permeameter is used to carry out the contact loss tests of laterite with different dry densities and sand filter at three seepage directions.The occurrence and development process of contact loss are investigated.The change in seepage velocity and permeability coefficient with hydraulic gradient and the influence of seepage direction and dry density of laterite on contact loss are discussed.The results show that the development process of contact loss can be divided into stable stage,transitional stage,secondary filter formation stage and failure stage.With the increase in hydraulic gradient,the permeability coefficient firstly remains constant or slightly increases,and increases obviously after the initial gradient is reached.It tends to be stable in secondary filter formation stage,and suddenly increases at failure gradient.The increase in dry density of laterite and the decrease in the intersection angle between the seepage direction and the contact interface both help to improve the resistance to contact loss. |
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| Keywords: | laterite contact loss seepage direction dry density |
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