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理论上辐射井回灌比大口井回灌具有明显的水量优势,但在水平井设计、施工、回灌量计算分析等方面仍有诸多问题,通过在北京西郊地区进行辐射井施工,开展回灌试验,结合北京地区辐射井施工问题,总结了砂卵石地区辐射井的成井工艺特点和实践经验,针对不同级配的砂卵石地层提出了使用潜孔锤多级偏心跟管钻进或双壁反循环钻进形成水平孔的工艺,形成回灌辐射井,地下水回灌试验证明辐射井具备良好的入渗效应,为砂卵石地区辐射井施工和回灌提供了技术和依据。
In theory, the recharge of radiation wells has obvious advantages in water recharge compared with those of large wells. However, there are still many problems in the design, construction and calculation of horizontal wells. Through the construction of radial wells in the western suburbs of Beijing, Irrigation experiment, combined with the construction of the radiation wells in Beijing area, summed up the wellbore process characteristics and practical experience of radiation wells in the area of sand and gravel. Aiming at different grading of sand and gravel stratum, Reverse circulation drilling to form a horizontal hole process, the formation of recharging radial wells, groundwater recharge test shows that the radiation well has a good infiltration effect for the construction of sand and gravel radiating wells and recharge technology and provide the basis.