Higher core recoveryassisted in coring operations when this kind of bit is used for hole enlargement.
加深井钻进,用双心钻头可增大环空间隙,提高固井质量.
It discusses the influences of each factor on coring of mixing pile from borer, drilling level, boring bit, geologic condition, length, arrangement and type of pile, stadium and external condition, in order to ensure coring quality of mixing pile.
从钻机、钻探水平、钻头、地质条件、桩长、桩布置及桩类型、龄期、外界条件等方面详细论述了各影响因素对搅拌桩取芯的影响,以保证搅拌桩的取芯质量。
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