三角形断面无壁排水暗管在非饱和土壤中减缓绕流作用的试验研究  

Experimental Research on the Effect of the Subsurface Drainpipe with the Triangular Sectionand Pipeless Wall on Inhibiting Flow around the Cross Section in Unsaturated Soil

作　　者：韩寒 李明思 柳幸爽 常玉荣 陈文娟 HAN Han;LI Ming-si;LIU Xing-shuang;CHANG Yu-rong;CHEN Wen-juan(College of Water and Architectural Engineering,Shihezi University,Shihezi 832003,Xinjiang,China;Faculty of Science,Shihezi University,Shihezi 832003,Xinjiang,China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]石河子大学理学院,新疆石河子832003

出　　处：《中国农村水利水电》2023年第12期172-179,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金重大项目“西北旱区农业节水抑盐机理与灌排协同调控”(51790533)。

摘　　要：为研究三角形断面无壁排水暗管在非饱和土壤中减缓水分绕流的作用,在室内土槽中对该暗管(标注为T1)进行了排水试验,以圆形断面无壁暗管(标注为CK)作为对照,并利用MATLAB对2种暗管周围的水分绕流过程进行了模拟。试验结果显示,T1暗管底部的土壤含水率小于CK的土壤含水率,但是T1底部的土壤含盐率大于CK的土壤含盐率,表明T1对土壤水分绕流现象的抑制作用好于CK的作用;T1的出水时间比CK的出水时间提早3.89 h,两种处理的排水及排盐量之间没有显著性差异(p>0.05)。模拟结果揭示了非饱和土壤中暗管排水的特征,从理论上证眀了T1下方的含水率低于CK的值,T1对绕流的抑制作用更好。研究结果显示,在非饱和土壤中三角形断面无壁排水暗管比圆形断面暗管能够更有效地抑制土壤水分绕流,有利于提高排水效率。The purpose of this paper is to study the effect of the subsurface drainpipe with triangular section and pipeless wall on inhibiting water flow around the cross section in unsaturated soil.In this study,the water drainage tests are carried out by using the subsurface drain⁃pipe with triangular section(symbol T1)in indoor soil tank,as well as the subsurface drainpipe with circular section(symbol CK)done as a control test,both kinds of drainpipes are pipeless wall.The MATLAB system is utilized to simulate the process of soil water flowing around pipe section.The experimental results show that the soil water content at the bottom of the drainpipe T1 treatment is less than that of CK treat⁃ment,and the soil salt content at the bottom of the drainpipe T1 treatment is more than that of CK treatment,indicating that the inhibitory ef⁃fect of T1 treatment on soil water flow around drainpipe cross section is better than that of CK treatment.The beginning time of soil water dis⁃charging from the outlet of T1 treatment is 3.89 h earlier than that of CK treatment, and there is no significant difference between the twotreatments in drainage and salt discharge(p>0.05). The simulation results reveal the characteristics of the drainage of this kind of subsurfacedrainpipe in unsaturated soil, which proves theoretically that the water content under the T1 treatment is lower than that of the CK treatment,and T1 treatment has a better inhibitory effect on the flow detour around drainpipe cross section. In unsaturated soil, the subsurface drainpipewith triangular section and pipeless wall can effectively inhibit soil water flow around the cross section than the circular section subsurfacedrainpipe, which is conducive to the drainage for this king of subsurface drainpipe in unsaturated soil.

关 键 词：三角形暗管 非饱和土壤 排水排盐 绕流 盐碱地治理 

分 类 号：S276[农业科学—农业水土工程] S156.4[农业科学—农业工程]