试验结果表明，箍筋间距越小，则柱承载能力越高，混凝土核心约束强度提高幅度越大。
Test results indicate that smaller hoop spacing provides higher column capacity and greater strength enhancement in a confined concrete core of columns.
钻压和转速是影响钻柱运动状态的两个主要因素，转速越高，越容易形成规则涡动；
The weight on bit and rotary speed are the main factors affecting the motion behavior of drill string. The higher the rotary speed is, the more easily the regular whirling will be formed.
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