塔中及其围斜区
the central Tarim and peri-clinal area
广域保护及其应用
Wide-area Protection and Its Applications
ETFE气枕围护结构
ETFE exteriorprotected construction
保护围岩
protect the surrounding rock
地下工程围护结构
underground engineering envelope
多级梯次联合围护
multi-echelon joint supporting system
多种围护结构组合
multiform retaining structure