According to the water balance principle, the expression of the phreatic table is established by considering
evaporation and considering evaporation & drainage respectively. The law of phreatic table variation
under the combined effects of considering evaporation & drainage is obtained. Based on Newton-Raphson iterative
method, calculation and analysis programs are done to solve the first order implicit differential equation of
the sewer drainage calculation considering phreatic evaporation. The calculation results show: after considering
phreatic evaporation, in the need of reducing the same height of phreatic, the sewer spacing is appropriately larger
than the case which didn’t consider the affection of phreatic evaporation; the phreatic drop speed in both effects
of evaporation and drainage is faster than the case of just considering the drainage effect. Phreatic evaporation
has a great influence to the subgrade sewer distance, phreatic evaporation needs to be considered in the subgrade
drainage design.
LIU Jie* (刘 杰), YAO Hai-lin (姚海林), LU Zheng (卢 正), YOU Hui-jie (游慧杰), DUAN Jian-xin (段建新)
. The Underground Sewer Drainage Design Analysis of Highway Subgrade Under Evaporation[J]. Journal of Shanghai Jiaotong University(Science), 2013
, 18(3)
: 289
-292
.
DOI: 10.1007/s12204-013-1396-z
[1] Chen Jian-bin, Kong Ling-wei, Zhao Yan-lin, et al. Evaporation effect in unsaturated soil and its influential factors [J]. Rock and Soil Mechanics, 2007, 28(1): 36-40 (in Chinese).
[2] He Ji-wu, Ma Ying-jie. The two-dimensional unstable flow finite element method for the calculation of drainage affected by evaporation [J]. China Rural Water and Hydropower, 2009, 12: 41-44 (in Chinese).
[3] Hu Shun-jun, Kang Shao-zhong, Song Yu-dong, et al. Variation of phreatic evaporation and its calculation method in Tarim River basin in Xinjiang Region [J]. Transactions of the Chinese Society of Agricultural Engineering, 2004, 20(2): 49-53 (in Chinese).
[4] Lei Zhi-dong, Yang Shi-xiu, Xie Sen-chuan. The soil water dynamics [M]. Beijing: Tshinghua University Press, 1988 (in Chinese).
[5] Verianov A. The level drainage facilities to control the irrigation salinization [M]. LOU Pu-li (trans.). Beijing: China Industry Press, 1963.
[6] Ma Ying-jie, Shen Bing, Hudan T. Spacing of drainage ditches in field under the influence of evaporation [J]. Shuili Xuebao, 2006, 37(10): 1264-1269 (in Chinese).
[7] Teng Kai, Qu Xin-yan. Further discussion on the calculation method of field drain spacing [J]. Shuili Xuebao, 1996(6): 81-87 (in Chinese).
[8] Ma Ying-jie. Study on phreatic water evaporation affected by crop growth in dry inland regions and farm drainage calculation [D]. Xi’An, China: Xi’An University of Technology, 2005 (in Chinese).
[9] Meng Chun-lei. Land surface modeling with enhanced considerations of soil evaporation and coupled transprot of soil moisture and heat [D]. Beijing: Beijing Normal University, 2006 (in Chinese).
