黄土地区边坡虹吸排水孔间距优化

doi:10.13278/j.cnki.jjuese.20200042

摘要/Abstract

摘要： 为使虹吸排水技术在黄土地区边坡应用中取得更好效果，考虑黄土各向异性进行虹吸排水孔间距设计，基于Neuman理论，利用土质渗透系数差异程度考虑黄土各向异性渗流规律，引用拦截比的概念，并结合降深与影响半径的关系，推导出了一种适合各向异性土体的虹吸排水间距解析解。结果表明：虹吸排水孔间距不仅与渗透系数和降深相关，还与竖向渗透系数与水平渗透系数之比有着较大的关系。在黑方台黄土地区的实际工程案例中，0.4 m为虹吸排水孔的最优间距。数值模拟及解析计算表明，单排排水孔间距在0.4 m的情况下拦截比为49.7%，满足工程实际要求。

关键词: 虹吸排水, 孔间距, 影响半径, 各向异性, 边坡

Abstract: In order to achieve better effect of siphon drainage technology in slope application in a loess area, the design of siphon drainage hole spacing considering loess anisotropy was carried out. Based on Neuman theory, according to the different degree of soil permeability coefficient, the anisotropic seepage law of loess was considered, the concept of interception ratio was introduced, and the relationship between depth drop and influence radius was combined. An analytical solution of siphon drainage spacing suitable for anisotropic soils was derived. The results show that the spacing of siphon drainage holes is not only related to permeability coefficient and depth drop, but also to the ratio of vertical permeability coefficient to horizontal permeability coefficient. In the actual case project in Heifangtai loess area, 0.4 m is the optimal distance between the siphon drainage holes. The numerical simulation and analytical calculation show that the interception ratio (49.7%) meets the practical requirements when the spacing of single row of drainage holes is 0.4 m.

Key words: siphon drainage, hole spacing, radius of influence, anisotropy, slope

中图分类号:

曹长鑫, 孙红月. 黄土地区边坡虹吸排水孔间距优化[J]. 吉林大学学报(地球科学版), 2021, 51(4): 1152-1159.

Cao Changxin, Sun Hongyue. Optimization of Siphon Drainage Hole Spacing on Slope in Loess Region[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(4): 1152-1159.

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