沉渣指钻孔和清孔过程中沉淀或塌孔留下的，未被循环泥浆带走的沉淀物。一般是较粗颗粒，沉渣厚度即这层沉渣的层高。但也有人认为，沉渣厚度就是一清测得孔深与下导管后测得孔深之差。 或者说不同的理解体现了对钻孔深度与沉淀后实际孔深的不同理解。
...词：旋挖钻机；砂层；地质；沉渣厚度；控制技术 [gap=168]Key words: rotary drilling rig; sand; geology; sediment thickness; control technology ...
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本发明还提供一种钻孔桩孔底沉渣厚度测量方法。
The invention also provides a method for measuring the thickness of sinking slag on the hole bottom of the bored pile.
含有沉渣的桩基随着沉渣厚度的增加其承载力也不断降低，桩沉降越来越大。
The bearing capacity and settlement of the piles with sediment in pile tip is reduced as the thickness of sediment increases.
本发明可以对钻孔桩孔底沉渣厚度进行客观的测量判断，而不需靠工程师的经 验和手感进行主观判断。
The tool can objectively measure the thickness of sinking slag on the hole bottom of the bored pile without the need of the subjective determination of engineers based on experience and hand feeling.
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