This paper introduced construction technique of the inverted vertical line survey system, boring, hole slope measuring, slope correcting, etc. of the Yantan hydropower station.
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2. 汶川地震断裂带科学钻探项目一号孔(WFSD - 1)钻遇了30多米的断层泥。
The first drilling hole of the Wenchuan earthquake fault science drilling project (WFSD-1) experienced up to more than 30 meters of the fault gouge drilling process.
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3. 除了有防雨功能外，在遇高温时可自动下落，盖住散热孔，隔绝空气。
In addition to water-resistant features, in the case of high temperature can be automatically whereabouts cover cooling hole, cut off from the air.
To raise wire-line drilling efficiency need to: 1. Select casing diameter and depth according to drilling depth, diameter, strata drilled and rock integrity, structure features, weathered layer depth;
To raise wire-line drilling efficiency need to: 1. Select casing diameter and depth according to drilling depth, diameter, strata drilled and rock integrity, structure features, weathered layer depth;
