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shi tan ti gao chong ji zuan jin sheng chan lv de tu jing
Author(s): 
Pages: 54-55+25
Year: Issue:  6
Journal: Geotechnical Investigation & Surveying

Keyword:  冲击钻进有效生产率纯钻进时间冲击锤钻进过程时间利用系数钢绳式生产效率工程地质勘察钻机;
Abstract: <正> 钢绳式冲击钻进是工程地质勘察中常用的一种钻探方法,如何提高其生产效率,减轻劳动强度,是一个很值得进一步研究的问题,本文就此问题进行了初步的探讨。一、钻进有效生产率的确定钢绳式冲击钻进的理论生产率(M_j)为:
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