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为建设青海某厂水源地,我队于1982—1983年在北川河西岸的Ⅰ、Ⅱ、Ⅲ级阶地与河漫滩地段上,对第四系进行了供水水文地质勘察与凿井工作,总共钻井(孔)31个。对于这些钻孔曾分别使用过泥浆,套管和水压等钻探方法,但是在工作初期应用泥浆法施工的两个钻孔,由于向孔内投加了大量粘土,稠的泥浆在孔壁上结成了较厚的不透水泥皮,严重地阻塞了水流通道,因此成井后虽然进行了洗井,可是出水量微少,影响了对
In order to build a water source for a factory in Qinghai, our team carried out water supply hydrogeological investigation and shaft sinking work on the Ⅰ, Ⅱ and Ⅲ terraces and river floodplains in the west bank of Beichuan River from 1982 to 1983, Hole) 31. Drilling methods such as mud, casing and water pressure have been used for these boreholes, respectively. However, two holes drilled at the beginning of the mud application were used. Due to the large amount of clay added to the boreholes, thick mud was applied to the hole walls Formed a thicker impervious cement skin, seriously blocking the water flow channel, so after completion of well washing wells, but the amount of water slightly affected the right