深层软式透水管优势排水效应及坡体浅层塌陷特征分析  

Analysis on preferential drainage effect of deep soft permeable pipes and shallow collapse characteristics of slope

作　　者：樊秀峰[1,2] 吕捷 吴振祥 程圆圆[1] 李千 FAN Xiufeng;Lü Jie;WU Zhenxiang;CHENG Yuanyuan;LI Qian(College of Environment and Resources,Fuzhou University,Fuzhou,Fujian 350108,China;Geological Engineering Fujian University Engineering Research Center,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学环境与资源学院,福建福州350108 [2]地质工程福建省高校工程研究中心,福建福州350108

出　　处：《福州大学学报（自然科学版）》2020年第6期786-793,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41502266,41861134011);福建省地质灾害重点实验室开放基金(FJKLGH2015K004)。

摘　　要：通过室内花岗岩残积土坡排水模型试验,考虑施工扩孔不均造成的渗流通道差异性影响,研究后缘补给条件下透水管优势排水机理及渗流时变规律.在试验基础上借助PLAXIS3D软件建立边坡透水管的三维渗流模型,定量分析排水不均效应及对边坡稳定性的影响.研究结果表明,当后缘补给水头恒定时,透水管渗流速度变化经历平稳期、迅速增长期、缓降期最终进入二次平稳期;施工扩孔轻微的不均,会对排水渗流场产生巨大的影响,在坡体内形成非均匀渗流,渗流优先向孔径偏大、倾角较缓的透水管处汇集,且渗流通道不断扩展演化,形成从孔径向外拓展的渗透系数增高带,细小颗粒从通道大量流失,结构受损,造成边坡局部变形增大,发生浅层滑塌.Through the indoor granite residual soil slope drainage model test,taking into account the differential influence of seepage channels caused by uneven construction reaming,the preferential drainage mechanism and seepage time-varying law of pervious pipes under the condition of trailing edge recharge are studied.The side is established with the help of PLAXIS3D.The three-dimensional seepage model of the slope permeable pipe quantitatively analyzes the effect of uneven drainage and its influence on the stability of the slope.The research results show that when the trailing edge recharge head is constant,the percolation pipe's seepage velocity changes through the plateau,rapid growth,and slow-down period and finally enters the second plateau.The slight unevenness of the construction reaming will have a huge impact on the drainage seepage field.Influence,the formation of non-uniform seepage in the slope body,the seepage preferentially gathers to the permeable pipe with a larger pore size and a slower inclination angle,and the seepage channel continuously expands and evolves,forming an increase zone of permeability coefficient that extends outward from the pore size,and a large number of fine particles from the channel loss and structural damage caused the local deformation of the slope to increase,resulting in shallow collapse.

关 键 词：边坡排水 透水管 渗流 优势通道 PLAXIS数值模拟 

分 类 号：TU4[建筑科学—土工工程]