These anomalies will be confined to the immediate vicinity of the exposed pipe . 这些异常将局限于裸管的紧邻地段。
2.
The special structure of zippered plastic pipe zippered seep holes made a greater seepage quantity on the condition of bare pipe ( no anti - blocking material adopted at the mouth of seep holes ) . so several kinds of anti - seepage material were adopted in the experiment of this part in order to find the proper anti - seepage material ( nonwoven fabrics glued by neoprene ) and working head ( 3m ' s working herd on initial irrigation ) 由于拉链式塑料管的独特构造(拉链式渗水孔口) ，裸管(渗水孔口不采用任何防堵材料)情况下渗流量很大，所以本部分试验采用了几种防渗材料试验，最后通过比较分析，找到了合适的防渗材料(氯汀胶粘无纺布)和工作水头(初始灌水时3m工作水头) 。
