Small-diameter vertical shafts constructed in the shallow space of steep mountainous areas - ScienceDirect

The Obir caves adjacent to the Periadriatic Fault in southern

Construction analysis of Guiyang Metro passing across Guiyang

Small-diameter vertical shafts constructed in the shallow space of

Small-diameter vertical shafts constructed in the shallow space of

Small-diameter vertical shafts constructed in the shallow space of

Small-diameter vertical shafts constructed in the shallow space of

Large diameter shafts for underground infrastructure - ScienceDirect

Small-diameter vertical shafts constructed in the shallow space of

Neoichnology of siliciclastic shallow-marine environments

Investigation on the failure mechanism of a tunnel entrance high