Sonic drilling is an effective means for collecting continuous core samples in all types of overburden formations.

声波钻进是在各种覆盖层中采集连续岩心样品的有效手段。

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One of the most important geophysical techniques is core drilling, which is carried out with a hollow cylinder through subsurface layers to obtain samples of rocks.

岩心钻探是最重要的地球物理勘探技术之一。进行钻探时，用一根空心管穿过地表下层获取岩石样品。

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Factors that influence the selection of compressive samples for core-drilling test of piling foundations are introduced and analyzed and methods to select the samples are provided in the paper.

介绍桩基础钻芯检测法抗压芯样选取方法的影响因素，并对各个因素进行分析，提出桩基础钻芯检测法抗压芯样的具体选取方法。

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As part of this lengthy process, petitioners were required to submit numerous items to the department, including detailed survey work and core drilling samples.

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