摘要
针对排水管在运营过程中的淤塞问题,借鉴土工织物的梯度比准则,利用梯度比试验,从水力梯度、土体类型以及排水管壁面积大小因素考虑,对软式排水管淤塞机理展开研究。研究结果表明:不同土体的梯度比G_r值随时间均呈现出明显的三阶段特征,即渗流通道开始快速发育时梯度比快速下降的现象,渗流通道逐渐成型时梯度比下降速度变缓的现象,以及土体细颗粒对排水管壁开始淤塞时梯度比缓慢上升的现象;土体黏粒含量的多少对排水管淤塞起主要影响作用,其次为排水管面积大小和水力梯度大小;通过稳定梯度比G_r值与相应单位体积含土量的对比,验证了梯度比对排水管壁在土体和水流作用下的变化的反映具有客观有效性。
Focusing on the siltation problem in the operation process,the gradient ratio experiment is carried out to study the problem of the drainage pipe siltation,considering the hydraulic gradient,the type of soil and the area of the drainage pipe.The results show that:the gradient ratio(GR)of different types of soil shows a distinct three stage features,the GR decreases rapidly when the seepage channel begins to develop rapidly.The GR gradually slows down when the seepage channel is gradually formed,and the GR increases slowly when the fine particles of soil begin to silt up the drainage pipe wall.The amount of clay content in the soil plays a major role in the silting of drainage pipes,followed by the drainage area and hydraulic gradient.Through the comparison of the GR and the soil volume of the corresponding unit volume,it is proved that the GR reflects the change of the drainage tube wall under the action of soil and water,and it is objective and effective.
作者
谢经辉
樊秀峰
吴振祥
XIE Jinghui;FAN Xiufeng;WU Zhenxiang(College of Environment and Resources,Fuzhou University,Fuzhou,Fujian 350108,China;Key Laboratory of Geohazard Prevention of Hilly Mountains,Ministry of Land and Resources,Fuzhou,Fujian 350108,China)
出处
《水利与建筑工程学报》
2018年第6期105-110,128,共7页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金项目(41502266)
福建省地质灾害重点实验室开放基金项目(FJKLGH2015K004)
关键词
排水管
梯度比
水力梯度
淤塞
单位体积含土量
drainage pipe
gradient ratio
hydraulic gradient
silting up
soil content per unit volume
