讨论了地层倾角和四臂井径测井的测量方法、资料处理以及识别崩落椭圆的原则，并列举出两个不同类型的实测例子。
The measuring method of four-arm diameter log, data processing and the principle of identification of breakout are discussed, and then two different kinds of examples are given.
最后，基于所有基础性的研究对非接触式超声波测量井径方法进行了实验。
At last, based on all fundamental researches, there is an experiment has been carry out for ultrasonic measure method.
它主要用于测量桩基钻孔的井径与井筒偏斜，也可用于帷幕、沉井井筒测量以及海岸工程、岩盐水溶开采的井下溶腔测量等。
Besides the diameter and inclination of pile foundation drill-hole, it can also be applied to other engineering, such as segmentation sinking, caisson sinking and halite mining by water-solution.
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