The detection of abnormal regions in complex structures is one of the most challenging
targets for underground space engineering. Natural or artificial geologic variations reduce …

Overbreak and underbreak are the crucial problems during the blasting excavation of
underground tunnels owing to their effects on the construction costs and operational safety …

Various methods have been proposed to ensure the serviceability of buried structures such
as road tunnels, urban utility tunnels, water conduits, underground shelters, and deposition …

With the reduction of shallow resources, the degree of damage and the frequency of
dynamic hazards, such as deep rock bursts and impact ground pressure, are increasing …

Underground tunnel excavation using the drill-and-blast method often results in underbreak
occurrences due to improper blasting parameters and complex geological environment. This …

In this paper, selected methods of destress blasting efficiency assessment are presented,
and novel quantitative methods based on in situ seismic measurements are proposed. The …

Abstract Knowledge of the degree and depth of the excavation damaged zone (EDZ)
resulting from drill-and-blast excavations has important influences on the design and …

This study examines the fracture mechanism of cracks and the final blasting effects on
defective rock masses under blasting loads. The failure processes of jointed rock with two …

When the presplit blasting is applied to rock excavation at a deep level, crack-forming
difficulties are encountered due to the characteristics of high geo-stress. In this study, the …

This study focuses on predicting and quantifying fragmentation phenomena under high
impulsive dynamic loading, such as blast, impact, and penetration events, which induce …