The size effect has a significant on the mechanical behavior of rock, thereby fundamentally influencing stability rock excavations. main challenge associated with experimental research fractured mass lies in difficulty specimen preparation to represent influence and fracture material. In order preliminarily explore feasibility 3D printing technology field mechanics, specimens different sizes ch...

This study investigates water-sand bursting disasters associated with fractured rock that affect safe mining in the areas of Western China. A broken seepage rheological test device was developed, and tests were conducted on multiple groups samples single-stage axial loading different load levels. When rheology each group stable, mixed fluid injected into at a certain pressure gradient to conduc...

This paper deals with full face excavation of large size tunnels in rock masses of very poor quality which exhibit squeezing problems. Three different time dependent constitutive models of increasing complexity (a viscoelasticplastic model, an elastic-viscoplastic model, and an elastic-plastic-viscoplastic model) are used to analyze the tunnel response during excavation of the Saint Martin La P...

According to chaos theory, some underlying patterns can disclose the order of disordered systems. Here, it has been discussed that intermittency rough rock fractured surfaces is an orderable disorder at intermediate length scales. However, this kind more complicated than simple fractal or even multi-scaling behaviours. It planned deal with multifractal spectra systematically change as a functio...