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基于透明土的水力梯度对渗流侵蚀影响试验研究

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为探究水力梯度对土体内部渗流侵蚀的影响规律,利用熔融石英砂作为透明土材料,以十五号白油与正十二烷按一定比例配置孔隙溶液,采用自研的PIV-PLIF(粒子图像测速-平面激光诱导荧光)渗流侵蚀试验系统研究了水力梯度对渗流侵蚀过程中孔隙溶液流速分布以及细颗粒运动的影响.结果表明:随着水力梯度的增大,示踪粒子流速也随之增大且不规则运动现象加剧,直到试样发生破坏流速才趋于稳定;同一水力梯度下,宏观流速略大于微观流速,两者之间的差距也随水力梯度的增大而不断缩小;当水力梯度达到临界水力梯度时,骨架颗粒中的细颗粒开始流失,渗透系数也开始发生变化,继续提升水头会使细颗粒大量流失而导致渗流通道不断发展扩大,最终达到破坏临界水力梯度,试样发生渗透破坏.
Experimental study on the influence of hydraulic gradient on seepage erosion based on transparent soil
In order to explore the influence of hydraulic gradient on the seepage erosion in soil,fused silica sand was used as the transparent soil material,and the pore solution was configured with No.15 white oil and n-dodecane in a certain proportion.Based on the seepage erosion system developed by PIV-PLIF(particle image velocimetry and planar laser induced fluorescence),the influence of hydraulic gradient on the flow velocity distribution of pore solutions and the movement of fine particles in seepage erosion damage was explored.The results show that with the increase of the hydraulic gradient,the flow velocity of tracer particles also increases and the irregular motion phenomenon intensifies,and the flow velocity tends to be stable until the sample fails.Under the same hydraulic gradient,the macroscopic flow velocity is slightly larger than the microscopic flow velocity,and the gap between the two is also narrowing with the increase of the hydraulic gradient.When the hydraulic gradient reaches the critical hydraulic gradient,the fine particles in the particle skeleton begin to lose,and the permeability coefficient also begins to change.If the water head continues to increase,a large number of fine particles will be lost,resulting in the continuous development and expansion of the seepage channel,and finally the critical hydraulic gradient of failure will be reached.

seepage erosionhydraulic gradienttransparent soilplanar laser induced fluorescence(PLIF)particle image velocimetry(PIV)

梁越、何慧汝、许彬、张鑫强、冉裕星

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重庆交通大学河海学院,重庆 400074

重庆交通大学国家内河航道整治工程技术研究中心,重庆 400074

重庆交通大学水利水运工程教育部重点实验室,重庆 400074

江西省港口集团有限公司江西省水运咨询有限公司,江西南昌 330008

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渗流侵蚀 水力梯度 透明土 平面激光诱导荧光(PLIF) 粒子图像测速(PIV)

国家自然科学基金面上项目重庆市技术创新与应用发展专项面上项目重庆市博士后特别资助项目重庆交通大学博士后科学基金项目重庆市研究生联合培养基地项目

52379097CSTB2022TIAD-GPX00452022CQBSHTB101022JDKJC-A008JDLHPYJD2021004

2024

10.3876/j.issn.1000-1980.2024.05.008

河海大学学报(自然科学版)
河海大学

河海大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.803
ISSN：1000-1980
年,卷(期)：2024.52(5)