自由出流条件下秸秆复合管的透水性能研究  

Water Permeability of Stalk Composite Pipe Under the Free Flow

作　　者：仵峰[1,2] 刘生东 宰松梅 王浩宇 牟彦文 罗昕 张梦瑶 WU Feng;LIU Shengdong;ZAI Songmei;WANG Haoyu;MOU Yanwen;LUO Xin;ZHANG Mengyao(School of Water Resources,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Henan Key Laboratory of Water-Saving Agriculture,Zhengzhou 450046,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]华北水利水电大学水资源学院,河南郑州450046 [2]河南省节水农业重点实验室,河南郑州450046 [3]华北水利水电大学水利学院,河南郑州450046

出　　处：《人民黄河》2022年第5期152-156,共5页Yellow River

基　　金：国家自然科学基金资助项目(51979108);中原科技创新领军人才资助项目(194200510008)。

摘　　要：秸秆复合管是以秸秆和土壤为主要原料制成的透水管道,可替代田间毛管进行地下灌溉。为了给秸秆地下灌溉系统的设计及应用提供参考,以工作压力和晾晒时间为试验因素,研究了自由出流条件下工作压力、升压过程和降压过程及晾晒时间对秸秆复合管透水性能的影响。结果表明:自由出流条件下,秸秆复合管累计渗水量随工作压力的增加而增加,累计渗水量与渗水时间呈幂函数关系,秸秆复合管的渗水过程可用Philip入渗公式进行拟合;当工作压力水头为10~50 cm时,秸秆复合管的渗水量在0.6~3.6 L/(m·h);稳定渗水速率与工作压力呈线性关系,工作压力水头在20~50 cm时,秸秆复合管达到稳定渗水后的渗水均匀系数均在0.85以上;压力升降过程影响秸秆复合管自由出流的渗水流量,降压过程其渗水速率的变化幅度大于升压过程;晾晒时间和工作压力交互影响秸秆复合管的渗水量,增加晾晒时间可以增加秸秆复合管的渗水量,但其渗水稳定性有所降低。Stalk composite pipe(SCP) is a permeable pipe, which is made of stalk and soil as the main raw material, can be used to replace field capillary pipes for subsurface irrigation. In this paper, effects of operating pressure head, process of pressure increasing and decreasing and drying time on the permeability of SCP were investigated under free flow condition, in order to provide a reference for the design and application of stalk subsurface irrigation system. The results show that under the condition of free flow, the higher the operating pressure head, the greater the cumulative seepage of SCP. The relationship of cumulative seepage and irrigation time can be expressed as a power function. The seepage process of SCP can be formulated by the Philip’s infiltration equation. The seepage of SCP is between 0.6-3.6 L/(m·h) under 10-50 cm operating pressure head. There is a linear relationship between the steady water seepage rate of SCP and its operating pressure head. The uniformity coefficient of seepage of SCP can reach to 0.85 during steady seepage under 20-50 cm operating pressure head. The seepage rate of SCP are affected by pressure rising and falling process. The variation of the seepage rate in the pressure decreasing process is larger than that in the pressure increasing process. There is an interaction effect on the water seepage of SCP between drying time and operating pressure head. The longer the drying time, the larger the seepage and the lower the seepage stability of SCP will be.

关 键 词：秸秆复合管 地下灌溉 工作压力水头 自由出流 渗水性能 

分 类 号：TV62[水利工程—水利水电工程]