中山大学学报自然科学版 ›› 2019, Vol. 58 ›› Issue (6): 97-103.doi: 10.13471/j.cnki.acta.snus.2019.06.012

• 论文 • 上一篇    下一篇

北江大堤的瞬态渗流分析与减压井防渗效果模拟

徐文兵, 姚清河, 王生,伍明兆   

  1. 中山大学航空航天学院,广东 广州 510006
  • 收稿日期:2019-01-03 出版日期:2019-11-25 发布日期:2019-11-25
  • 通讯作者: 姚清河 ( 1980 年生) ,男;研究方向:流体力学; Email: yaoqhe@mail.sysu.edu.cn

Transient seepage analysis of Beijiang levee and simulation of anti-seepage effect of decompression well

XU Wenbing, YAO Qinghe, WANG Sheng, WU Mingzhao   

  1. School of Aeronautics and Astronautics Sun Yat-sen University,Guangzhou 510006,China
  • Received:2019-01-03 Online:2019-11-25 Published:2019-11-25

摘要:

采用渗流有限元计算方法(FEM),对北江大堤的瞬态渗流进行数值模拟,设计并优化了防渗方案。首先,使用测压管实测数据与稳态计算进行对比,计算结果与实测数据基本吻合。然后,计算在短时间内水位突涨后的瞬态渗流场。最后,选择减压井作为防渗措施并对其进行优化。结果表明:与稳态同等水位下相比,瞬态应做出更高的安全措施;水位为15.78 m时,得出的坡降达到0.5,堤防发生破坏;减压井排水减压效果受贯入深度影响较大,随着贯入深度的增加效果逐渐提升;同一渗透系数土层内在3/5与4/5深度排水减压效果提升相对较小;由于地质条件的不同,同样的减压井放在不同的位置效果差距很大,水平距离为95 m时的防渗效果最佳,深度为16.5 m时效果最佳。

关键词: 堤防工程, 渗流分析, 减压井, 数值模拟

Abstract:

In this paper, the seepage finite element method (FEM) is used to simulate the transient seepage of Beijiang dike, and anti-seepage solutions is designed and optimized.Firstly, the measured data of pressure gauge tube are compared with the steady-state calculation model, and the calculated results are basically in agreement with the measured data.Then, the transient seepage field after the sudden rise of water level in a short time is calculated. Finally, relief wells are selected as seepage control measures and optimized. The results show that higher safety measures should be made for transient at the same level as steady state. When the water level is 15.78 m, the slope reaches 0.5, and the embankment is damaged. The drainage and decompression effect of relief wells is greatly affected by penetration depth. With the increase of penetration depth, the effect of drainage and decompression in the same permeability coefficient soil layer increases gradually, and the effect of drainage and decompression in the depth of 3/5 and 4/5 is relatively small due to geological strips. Due to the different geological conditions, the same relief wells are placed in different positions with a wide gap in effect.,the anti-seepage effect is the best when the horizontal distance is 95 m, and the effect is the best when the depth is 16.5 m.

Key words: dike engineering, seepage analysis, relief well, numerical simulation

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