d&b 鉆炸法(drill and blow)
tbm 全斷面隧道鉆掘機(jī)(tunnel bore machine)
t.h. 上半斷面(top height)
b 臺(tái)階(bench)
i 仰拱(invert)
natm 新奧工法(new austrian tunnel method)
rmr 巖體評(píng)分(rock mental ratio)
rqd 巖石品質(zhì)指標(biāo)(rock quality directive)
t.i. 臨時(shí)仰拱(temporary invert)
ccm 明挖覆蓋工法(cut and cover method)