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豫东平原浅层地下水约40米左右,属黄淮冲积而成,西起兰考,东至虞城,北起古黄河大堤,南至陇海铁路两侧为带状背河洼地,土壤盐碱化严重。该区地下水属“二元结构”型,上部弱透水层厚度约20～25米左右;多呈亚砂、亚粘、粉细砂互层;下部含水砂层原度约5～15米左右,在该区钻出机井具有灌溉和排水的双重任务,选择适于本区特点的井型,对于灌溉和排水,改良盐碱地有重要意义,通过试验和研究,认为异骨料井是一种较好的井型。异骨料井兼有大骨料井和单一开采砂层井的优点。其主要特点是:
About 40 meters shallow groundwater in the eastern Henan Plain, belong to the Huanghuai alluvial, west of Lankao, Yucheng east, north of the ancient Yellow River embankment, south to the Longhai Railway on both sides of the strip river backwater, soil salinization Seriously. The groundwater in this area belongs to the “binary structure” type. The thickness of the upper aquitard is about 20-25 meters. Most of the groundwater is sub-sand, sub-viscous and silty sand. The lower part of the water-bearing sand layer is about 5-15 meters, Drilling wells in this area has the dual task of irrigation and drainage. Selecting the type of well suitable for this area is of great significance for irrigation and drainage and improving saline-alkali soil. Through experiments and studies, it is considered that the heterogeneous well is a better one Well type. Isotropic aggregate wells have both the advantages of large aggregate wells and single mining sand wells. Its main features are: