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结合施工过的水井实例,介绍了水文水井钻探施工中常用的钻探工作类型:回转钻进,冲击钻进及冲击回转钻进。其中回转钻进适合于砾石粒度小于80—100mm的地层,冲击钻进要求小于200mm的砾石总最不能超过50%,且地层均匀,而冲击回转钻进适合于含大漂石地层。在钻探施工中应根据具体工程地质条件,选用水井配套设备,并对施工中常见的钻进事故,提出了相应的解决办法。
Combined with the examples of wells that have been constructed, the drilling types commonly used in the drilling of hydro-wells are introduced: rotary drilling, percussion drilling and percussion rotary drilling. The rotary drilling is suitable for the formation of gravel with grain size less than 80-100mm. The total amount of gravel less than 200mm for impact drilling is less than 50%, and the formation is uniform. Impact drilling is suitable for the formation with large boulders. According to the specific engineering geological conditions in the drilling construction, we should select the equipment of water well and put forward the corresponding solutions to the common drilling accidents in construction.