软式透水管作用下边坡排水效应数值模拟  

Numerical Simulation of Slope Drainage Effect of Soft Permeable Pipe

作　　者：李千[1,2] 樊秀峰[1,2] 吴振祥[1,2] 

机构地区：[1]福州大学环境与资源学院,福建福州350108 [2]国土资源部丘陵山地地质灾害防治重点实验室,福建福州350108

出　　处：《水利与建筑工程学报》2016年第6期44-49,58,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)

摘　　要：借助PLAXIS 2D数值模拟软件在二维条件下通过工程算例对软式透水管不同布设工况下的排水效应展开研究。研究结果表明：边坡后缘水头每增高1 m,透水管最大流速以11%~44%幅度提高;透水管长度为25 m比10 m达到近似平衡的时间延长33%;透水管下端封堵比未封堵排泄速度提高近百倍;透水管孔径增大能加快渗流场的平衡过程,而对排水效果影响不大;透水管布设高程及打设角度需考虑与地下水位的相对位置,当透水管底部深入后缘丰富地下水时,随着透水管被地下水浸润的长度越长,透水管对坡体渗流场调控的范围越大,越能发挥透水管的导水能力。As permanent facilities,the long-term stability problems of slope engineering have become increasingly prominent. Stability of slope depends greatly on the effectiveness of the drainage system,and as an important part of slope drainage system,the study of the soft permeable pipe＇s effect on slope seepage field is of significant importance. Therefore,using PLAXIS 2D numerical simulation software in two-dimensional condition through engineering example to study the soft permeable pipe＇s drainage effect under different arrangement. The results show that the rear water table of slope increases 1 meter,the maximum flow rate of the soft permeable pipe can increase 11% ~44%. 25 meters length of soft permeable pipe cost 33% more time than 10 meters length to reach the approximate balance. The drainage velocity of the lower end of the soft permeable pipe is nearly 100 times higher than that is not plugged. The increase of soft permeable pipe＇s aperture can speed up the seepage equilibrium process,but has little effect on the drainage effect. The layout and installation angle of soft permeable pipe should consider the relative position with the water table,when the bottom of the soft permeable pipe reaches underground water table,the more the length of soft permeable pipe being infiltrated,the greater the range of the slope seepage being controlled,and the drainage capacity of the soft permeable pipe will be increasingly developed.

关 键 词：边坡工程 软式透水管 排水效应 数值模拟 PLAXIS 2D 

分 类 号：TU457[建筑科学—岩土工程]