期刊文献+

水平面渗流有限元中利用接触单元模拟悬挂式阻水结构 被引量:6

Simulateing suspended cut-off structures by horizontal seepage FEM with contact elements
下载PDF
导出
摘要 区域性渗流场由于范围大,通常忽略掉竖向的水头损失而用水平面二维有限元进行分析,但在城区区域渗流场中悬挂式阻水结构物量多,竖向绕流现象突出,用一般水平面二维有限元进行分析将产生较大的偏差。针对这一问题在悬挂式结构体周边引入一层无厚度界面接触单元。在水平面有限元中利用它考虑因竖向绕流产生的局部水头损失。利用阻力系数的方法和二维状态下截面突变流道流动的解析解,同时考虑防渗墙本身的弱透水性,推导了接触单元的导水矩阵。应用接触单元编制了相关程序,在水平面有限元中利用接触单元对悬挂式阻水结构进行分析,并将结果与三维有限元进行比较,两者的计算结果在流量上保持一致,在水头上前者是后者在同一位置处沿高程方向平均值。提出的该计算方法,对于用水平面二维有限元分析含有悬挂式阻水结构的大区域渗流问题,是一个有效的手段。 For the large scale of regional seepage fields the horizontal 2D FEM is usually chosen as the analysis tool which assumes that the hydraulic head loss caused by vertical flow can be ignored. However, the hydraulic head loss around suspended structures is apparent. If the horizontal 2D FEM is used to model the suspended structures a major error will occur. In order to simulate suspended structures using the horizontal 2D FEM, a contact element is introduced. The contact element is used to consider the hydraulic head loss caused by vertical flow near suspended structures. The matrix equation of contact elements is deduced. The deduction is based on the coefficient resistance method and the analytical solution of flow near suspended cut-off walls under plane condition. The corresponding procedure is programmed. Two examples are studied. The result accuracy is assessed by comparison with 3D FEM. It is shown that they coincide each other on discharge; and that the hydraulic head gained by proposed method is the mean value of that computed by 3D FEM at the same location. The method presented is an effective way to simulate suspended cut-off structures in regional seepage fields.
出处 《岩土力学》 EI CAS CSCD 北大核心 2007年第12期2691-2697,共7页 Rock and Soil Mechanics
关键词 城市地下水 渗流 悬挂式阻水结构 阻力系数 有限元 urban groundwater seepage partially penetrated structure resistance coefficient finite elements
  • 相关文献

参考文献3

二级参考文献17

  • 1毛昶熙,段祥宝,蔡金傍,茹建辉.悬挂式防渗墙控制管涌发展的试验研究[J].水利学报,2005,36(1):42-50. 被引量:44
  • 2余成学 郭艳阳 汪卫明 等.块状岩体中渗流的求解方法(英文)[J].岩石力学与工程学报,2001,20(3):359-364.
  • 3顾慰慈.渗流计算原理与应用[M].北京:中国建材工业出版社,2000.10-11.
  • 4毛昶熙 周保中.闸坝地基渗流计算的改进阻力系数法.水利学报,1980,(5):51-59.
  • 5Gillham, R W.Sensitivity analysis of imput parameters in numerical modelling of steady states regional ground Water Flow[J]. Water Resources ,1974, 10: 529-538.
  • 6Li W H.Differential equations of Hydraulic transients,dispersion and groundwater flow[M].Prentice Hall Inc.,Englewood Cliffs,N.J.,1972.
  • 7李祖贻 陈平.有限元法计算井的渗流对奇异点的处理[J].水利学报,1984,5:41-50.
  • 8王勖成 邵敏.有限单元法基本原理和数值方法[M].北京:清华大学出版社,1995..
  • 9郑少河,朱维申.裂隙岩体渗流损伤耦合模型的理论分析[J].岩石力学与工程学报,2001,20(2):156-159. 被引量:66
  • 10许季军,张家发,程展林.堤防半封闭式防渗墙防渗机理及设计参数研究[J].人民长江,2001,32(5):42-43. 被引量:13

共引文献79

同被引文献47

引证文献6

二级引证文献28

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部