the scope of this research is to investigate the effect of geometrical and physical input parameters in crustal viscoelastic deformation models. to do this analysis viscoelastic model of wang et al., 2006 is used. the increasing quality of data on time-dependent deformation of the earth's surface can be used to extract more details on the spatial and temporal development of earthquake-rela...

BACKGROUND The pathogenesis of fifth metatarsal stress fractures remains uncertain. HYPOTHESIS Physical characteristics and environmental factors, which have received limited attention in the literature thus far, might be involved in the development of fifth metatarsal stress fractures. STUDY DESIGN Case-control study; Level of evidence, 3. METHODS To test the study hypothesis, a medical ...

Surface movement and deformation with fault differ significantly from that without fault. To explore the mechanism of abnormal surface subsidence induced by instability, mechanical model for slip soil cantilever were separately established when mining in hanging wall footwall. Moreover, based on numerical similarity simulation experiment, difficulty instability was compared analysed. The result...

Spectral, angular, and temporal distributions of fluorescence as well as specular reflection were investigated for silica-based artificial opals. Periodic arrangement of nanosized silica globules in the opal causes a specific dip in the defect-related fluorescence spectra and a peak in the reflectance spectrum. The spectral position of the dip coincides with the photonic stop band. The latter i...

The common occurrence of various number and distribution hole flaws complicates the mechanical behavior fracture mode rock masses that contain them. This study develops seven numerical models limestone samples with different numbers distributions circular using 2-D particle flow discrete element code (PFC2D) to investigate their impact on properties while maintaining same area. In addition, it ...

The coupled fluid-flow and stress model with time-dependent effect is developed. In this model, rock mass is simulated as a homogeneous and isotropic dual-porosity, dual-permeability continuum. Darcy’s law is used to describe the fluid flow in a porous medium, and cubic law is used to describe the flow in fractures. The finite element method is introduced to solve the system, and the effects of...

The formation of a rich underground-seam network is the key problem in development low-permeability hot dry rock (HDR) resources. Considering lack macroscopic continuum theory to study hydraulic fracturing having preset fracture-interface element, particle-flow method micro-mechanical discrete-element introduced simulate mechanical behavior for HDR low permeability reservoirs. reservoir simulat...

The significant vertical heterogeneity, variations in ground stress directions, and irregular bedding interfaces make it extremely challenging to predict fracture propagation continental shale reservoirs. In this article, we conducted a series of triaxial laboratory experiments on outcrop rocks investigate the effects formation dip angle wellbore orientation crack under horizontal well conditio...

Among stress fractures associated with sports activities, patellar stress fracture is rare. Regarding patella stress fractures, so far only distal transverse or lateral longitudinal fractures have been reported, but there are no reports of transverse fractures occurring in the proximal patella. We describe an extremely rare case of transverse stress fracture of proximal patella in a 9-year-old ...