大洞径隧洞钻爆法开挖松动圈超声波长观孔检测应用实例
대동경수동찬폭법개알송동권초성파장관공검측응용실례
An Example of Detection by Ultrasonic Wave Through Long-term Observation Hole in Loose Ring of Large-Diameter Tunnel Excavated by Drilling and Basting Method
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