高压水射流径向水平孔钻进技术是水平孔施工技术之一，它是在垂直瓦斯抽放或煤层气勘探钻孔布置机械或水力扩孔装置，对准选定的煤层部位进行扩孔。
As one of radial horizontal drilling techniques, high pressure water jet drilling technology is capable of using mechanical or water jet apparatus to make a cavity at the selected coal seam.
阐述了管井井点排水的设计布置及井点钻孔质量、三滤质量、洗井质量、抽水连续性等关键工序的施工技术。
The design layout, key process of construction, such as well point drilling quality, filtrating quality, well washing quality, continuity of pumping were discussed.
简要说明压浆法处治路基下软弱地基的方法，平面布置、孔径，确定压力、钻孔深度，以及压浆工艺流程。
The text show the method to transact soft base under subgrade by mudjack, plane furnish, hole site, confirm pressure, deep of bore and technics flow of mudjack.
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