自由出流条件下秸秆复合管的透水性能研究.

The straw composite pipe is a permeable pipe made of straw and soil as the main raw materials, which can replace the field capillary for underground irrigation. In order to provide reference for the design and application of straw underground irrigation system, the working pressure and drying time were used as experimental factors to study the effects of working pressure, pressure increasing process, depressurization process and drying time on the water permeability of straw composite pipe under the condition of free outflow. Influence. The results show that: under the condition of free outflow, the cumulative water seepage amount of the straw composite pipe increases with the increase of the working pressure, and the cumulative water seepage amount has a power function relationship with the water seepage time. The water seepage process of the straw composite pipe can be fitted by the Philip infiltration formula; When the working pressure head is 10-50 cm, the water seepage of the straw composite pipe is 0.6-3.6 L/(m h); the steady water seepage rate has a linear relationship with the working pressure. The uniform coefficient of water seepage after the composite pipe reaches stable water seepage is all above 0.85; the pressure rise and fall process affects the seepage flow rate of the free outflow of the straw composite pipe, and the change range of the seepage rate in the depressurization process is greater than that in the pressure increase process; drying time and working pressure The water seepage of the straw composite pipe is affected interactively. Increasing the drying time can increase the water seepage of the straw composite pipe, but its water seepage stability decreases. [ABSTRACT FROM AUTHOR]