The evaluation of engineering rock mass quality is fundamental work for the engineering
activities of rock mass. The increasing scale of rock mass engineering necessitates higher …

The damage-fracture evolution of deep rock mass has obvious particularity, which is
revealed in 2400-m-deep tunnels by field tests. The evolution of the excavation damaged …

The behavior of rock damage evolution under unloading conditions is of utmost importance
for the analysis of the stress-induced failure of overstressed rock masses. In this paper, a …

Presence of an excavation damage zone (EDZ) around a tunnel perimeter is of significant
concern with regard to safety, stability, costs and overall performance of the tunnel. For deep …

Excavation-damaged zones (EDZs) are caused by repeated blasting and can significantly
influence the overall performance of underground excavation engineering. The …

Rock mass excavation is accompanied by rock deformation during unloading, which
degrades the quality of rock mass and significantly affects the safety and stability of rock …

Deformation caused by excavation is of great effects on tunnel stability and tunnel support
design. Monitoring using instruments that are installed in place within the examined tunnel …

Fractures are commonly found throughout rock masses. The propagation and coalescence
of these fractures can significantly weaken the surrounding rock strength during …

Measuring the permeability of tight rocks remains a challenging task. In addition to the
traditional sources of errors that affect more permeable formations (eg sample selection, non …

How to ensure the construction safety is one of the key problems for the deep tunnel
excavation. Since a tunnel excavation is an unloading process in essence, a novel method …