... thickness has an influence on the crack path, failure modes and the initiation of anti-wing crack. Introduction Cracks can be classified into closed crack, open crack and filled crack according to the mechanical features of the joint surface. Current research on the propagation behavior of cracks...

... than 5 degrees. The 2 # coal seam structure is relatively sim- ple, seam thickness is 4.6 10.6 m. The 222203 work- ing face which was the research object In this paper, is in 2-2 coal seam. Ground level is 1466.0 1537.0 m, working face level is 1383.6 1402.3 m, the average depth is 85 m...

... Abstract The function mode of influencing factors and recognition method for the loose zone of large span tunnels which are built in heavily jointed rock stratum are very important. Factors like the thickness of overlying weak rock stratum, tunnel depth and joints occurrences are influencing...

... mechanics geostress tensile deformation Thickness zonal disintegration phenomenon rock mass tunnel mechanism excavation deep rock mass ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods Recent Advances in the Zonal...

..., and their shapes and sizes, which ranged between a fraction of mm and tens of cm were measured. Frequencies of mass of different particle sizes as well as shapes of particles were determined The particles were typically flat slabs with a thickness 0.1 of the length. They were much thinner at the edges than...

... and thickness of grouting ring to seepage field are analyzed. According to the research, the pore water pressure and water inflow induced by tunnel excavation can be hardly affected by arching effect. If keeping the water level above horizontal plane fixed, the distribution of pore water pressure...

... Modeling & Simulation Fluid Dynamics reservoir geomechanics Wellbore Design Thickness wellbore integrity Upstream Oil & Gas ground massif geomechanical model Reservoir Characterization flow in porous media displacement correspond soil strength test massif circular cut...

... INTRODUCTION The response of layered and competent rock in the roof of underground openings has often been approximated by that of an elastic fixed-end beam under distributed load equal to the beam self-weight. The stability of such a roof is closely related to the thickness of the beams and the bedding plane...