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挑顶 tiǎodǐng
gen.	barringdown; brush; canch; caunch; caunche
expl.	overbreaking
tech.	back brushing; brushing of tunnel top; datalling; overbreakage; overcut; second ripping; top canch; top picking (隧道工程)
挑顶参见 back canch tiǎodǐng
expl.	backbrushing
挑顶必要时在巷道中挑落部分顶板岩石的作业。参见 ripping tiǎodǐng
expl.	roof ripping
挑顶参见 backbrushing tiǎodǐng
expl.	back canch
挑顶采用爆破方法扩大导洞及既有巷道顶板,开挖成理想断面的作业。在隧道掘进中，有时也采用挑顶的方法来提高光面爆破的效果。此时，预留的挑顶部位，其采用瞬发电雷管超爆的周边炮孔应和主体掘进炮孔分开爆破 tiǎodǐng
expl.	ripping

挑顶: 58 phrases in 5 subjects

Explosives and Explosive Ordnance Disposal	9
General	2
Oil / petroleum	1
Rail transport	2
Technology	44