Due to the opaqueness of rock and limitation detection technology, it is impossible accurately describe crack growth process determine law breakage. Based on smoothed particle hydrodynamics finite element method (SPH-FEM), a numerical model for high-speed water jet breaking was established in this work simulate fragmentation impacted by jet, study effects different angles propagation microscopi...

Investigating fire effects is a continuing endeavour in the research and practice communities concerned with design safety of shield tunnels. This paper aims to provide comprehensive model for assessment structural tunnel segmental ring exposed fire. A thermo-mechanical assembled structure developed basis holistic analysis by incorporating lining segments longitudinal joints, as well improved p...

This paper reports the sliding wear properties and mechanisms of Hadfield high-Mn austenitic steel in a dry-sliding reciprocal tribotest against WC counterpart. The associated were studied through extensive characterisation obtained worn surface using analytical SEM, TEM, XRD micro-hardness test. revealed coefficient scale 10?14 m3·N?1·m?1 friction 0.5–0.6. encountered severe plastic deformatio...

The coal walls in a caving face with tall mining height are prone to rib spalling, which leads the phased cessation of working face, causes heavy losses, and endangers safety underground workers. In order prevent serious spalling accidents fully mechanized faces large improve prediction ability control load-bearing mechanical model roof–coal wall–support system was established based on moment-b...

Abstract The vertically‐jointed coal seam, especially after water drainage, is easy to lead large‐area wall spalling (CWS). To alleviate the problem, a strut subjected equivalent central‐concentrated force was proposed for elaborating critical conditions instability based on CWS characteristics, determining main control factors. sensitivity analysis of factors driving revealed that between 3.3 ...