... the drill rod diameters and by keeping the velocity of the drill rod constant. The geometry of the rods taken for the present study is cylindrical in shape. The extent of damage in the rock domain was assessed and compared for both percussive and rotational drilling techniques with cylindrical drill rods...

... pressure will be influenced by the cavern diameter, the installation depth (ID), and the rock properties. The larger the diameter of the cavern, the greater the force to lift the ground. The shallower the installation depth, the smaller the ground pressure. The shorter the distance between the caverns...

... Characterization circular ore pass diameter ore size distribution ore pass metals & mining isrm international symposium asian rock mechanics symposium 29 discrete element method ore pass hang-up particle vertical ore pass square ore pass Simulation cohesion cross-sectional shape friction...

..., and shot diameter) on fracture initiation and propagation in the horizontal well has been studied based on lots of true tri-axial laboratory experiments. The experimental results reveal that: two types of fracture geometries are observed in perforated horizontal well under different perforation parameters...

... boring method (Shaterpour-Mamaghani and Bilgin, 2016; Shaterpour-Mamaghani et al., 2016). Reservoir Characterization Limestone quarry diameter waste management strength rock strength excavation thrust force raise boring method Upstream Oil & Gas RBM reamer head Shaft Excavation...

... (Saucier R J. 1978). On the basis of this previous study, the formula of shaped-charge penetration of rock under formation stress has been established (Halleck P M. et al. 1988). A model takes into account change in density of jet as it stretches during penetration while maintaining a constant diameter has...

... Reservoir Characterization micro-tunnel boring machine diameter underground space ground condition Matsui pipe-roofing technology rail transportation Shimada pipe shaft ground transportation isrm international symposium asian rock mechanics symposium 29 construction MTBM...

... particle diameter diameter Modeling & Simulation cement particle cement-based grout sakakibara particle velocity field injection cfd-dem simulation filtration outflow equation 8th Asian Rock Mechanics Symposium ARMS8 14-16 October 2014, Sapporo, Japan 2D CFD-DEM simulations for injection...

... Abstract To satisfy the need for development of transportation infrastructure, hydropower, water supply, etc ., more long, deep, and large diameter tunnels and underground caverns are being, or will be, constructed in China. Commonly, they may be characterised as being under heavy overburden...

... transfer behaviour at the cable/grout and grout/rock interfaces. However, recent work has identified a number of issues with this method as outlined in this paper. Firstly, the diameter effect of the rock sample which is used to confine the grouted cable bolt is studied since the traditional LSEPT...

... Characterization asian rock mechanics symposium arms8 proceedings granite specific energy diameter slug Upstream Oil & Gas internal damage experimental study structural geology pulsation frequency marble sample Dehkhoda october 2014 rock breakage 8th Asian Rock Mechanics Symposium ARMS8 14-16...

... Rock mechanics diameter intermediate principal stress compressive strength tensile strength Upstream Oil & Gas criterion triaxial extension test MPa principal stress strength circular plate uniaxial triaxial compression test rock tensile strength Effects of Intermediate Principal...

... the results obtained from static and seismic analyses of the tunnel at different diameters. 1. 2. 3. 4. Figure 2. Before and after the application of seismic coefficients, D=5m Figure 3. Before and after the application of seismic coefficients, D=10m Figure 4. Before and after the application of seismic...

... jaw. Flat platen loading supplies ideal splitting on the vertical diameter of disk. However, flat platen caused to occur crack initiation in compressive zone of some disks. This is an important reason for invalidity of test, because cracking must be started by tensile stresses. Thoughness is very...

.... The installed capacity of the project is 195MW. The size of the proposed underground powerhouse cavern is 118m X 24.5m X 42m. The other main structures are 11m diameter, horse shoe shaped head race tunnel, orifice type spillway, surge and pressure shafts, tail race channel, etc. The layout plan of the project...

... ABSTRACT Permeability variation during deformation and failure in triaxial test was considered for Shikotsu welded tuff. Pure water saturated cylindrical test specimens of 30 mm in diameter and length of 60 mm with constant flow rate method at 0.3 ml/min was introduced for compression...

.... hydraulic fracturing strength Wellbore Design circular rock specimen contingency planning criterion tensor Mining Science failure process geomaterial diameter plastic strain particle specimen Rock Failure analysis Reservoir Characterization Upstream Oil & Gas Rock mechanics...

... effective in weak formations. Reservoir Characterization displacement shotcrete plastic zone empirical method diameter lining rock mass classification penstock tunnel rock bolt permanent support system support system tunnel classification Thickness lattice girder rock mass rudbar...

... performance in concrete. Whereas, for structural applications steel fibres are suited over synthetic fibres, which do not contribute to mechanical load bearing due to their low Young's modulus. Upstream Oil & Gas strength diameter lining Engineering reinforcement deflection protection...

... ABSTRACT: This paper presents the procedures and effects of pre-drainage of coal seam gas by long boreholes with large diameter. The investigation was carried out by onsite experimental measurements and laboratory numerical modeling. Onsite investigation results from the six roadways of Dingji...