厚包气带中渗井建井工艺研究及回灌试验--以滹沱河冲洪积扇藁城段渗井为例

渗井作为一种重要的地下水人工回灌方式,在厚包气带地区有着重要的应用优势,但井内无水,如何解决建井过程中泥浆堵塞及冲洗问题是其推广应用的瓶颈。以滹沱河冲洪积扇藁城段实施的渗井为例,从钻进工艺、泥浆、砾料和滤水管的选择,洗井工艺,堵塞处理方法等方面进行了探究。通过开展回灌试验表明,洗井效果良好,植物胶在地层内随时间延长逐步降解,渗井回灌能力也逐步增大,最大可达到50 m~3/h。渗井的成功建设丰富了我国北方水资源综合开发利用的技术与方法。

Study on well-building technology of the vadose-zone well and recharge test in thick aeration zone---a case study of the vadose-zone well in the alluvial fan of Hutuo River in GaoCheng

As an important mode of groundwater artificial recharge, the vadose-zone well has many advantages in the area of thick aeration zone. However, as no water in the well, how to resolve the problem of washing the plugging mud in the process of well-building is always the bottleneck for its popularization and application. In the paper, the vadose-zone well in the alluvial fan of Hutuo River in GaoCheng is taken as an example. Drilling techniques, selection of mud, filling gravel and strainer, well washing techniques, and ways of handling plugging were explored. The recharge test shows that the effect of well washing is well, that the vegetable gelatin gradually degrades over time within the strata, and that the recharge capacity of the vadose-zone well gradually increases, which can reach to 50m₃/h. The success of the vadose-zone well construction enriches the techniques and methods of comprehensive development and utilization of water resource in the northern part of China.