大口径塑料井管开孔率与水力特性的关系研究

Relationship between opening ratio of large- caliber plastic well tubes and hydraulic characteristics

灌溉用大口径塑料井管的应用受试验研究滞后制约,致使至今未能被推广应用.选择开孔率分别为1.54％,3.09％,5.83％,8.75％,11.06％,14.24％,16.52％,21.38％和26.24％的井管,对大口径塑料井管的水力学特性进行试验研究,分析其开孔率大小与出水量、水跃等水力学特性的关系.结果表明：从流量因素分析,开孔率的适宜范围为5.83％ ～ 14.24％;从水跃因素分析,开孔率应不小于8.75％;综合流量和水跃的实验结果,中300 mm、厚9.82 mm的光壁管,在细砂含水层、滤料为中粗砂的情况下,适宜开孔率大小为8.75％～14.24％.

For the reason of backward research, the application of large - caliber plastic well tubes for irrigation has been restricted. The relationships between opening ratio of large - caliber plastic well tube and water yield amount, water jump etc. were studied by selecting the opening ratio of 1.54%, 3.09%, 5.83%, 8.75%, 11.06%, 14.24%, 16.52%, 21.38%, 26. 24%. The results indicated that the opening ratio of large - caliber plastic well tube should be 5.83% - 14.24% in the view of water yield amount and larger than 8.75% in the view of water jump; by comprehensively considering the test results of water yield amount and water jump, the suitable opening ratio of 8.75% - 14.24% for smooth - wall pipe with diameter of 300 mm and thickness of 9.82 mm, is recommended in the case of fine sand aquifer with a filter of coarse sand.