... ABSTRACT: Tunnels constructed in soft rock and high field stress show significant gradual convergence with even after the excavation. This paper proposes a new visco-elastic-plastic solution for deep circular tunnel under squeezing conditions. The model is composed of Mohr-Coulomb plasticity...

... as the need to support the weight of the overburden strata up to the ground surface (Esterhuizen et al., 2011.) metals & mining pillar strength upstream oil & gas displacement reservoir characterization support reaction curve equilibrium point criteria convergence src correspond...

... surveys and convergence measurements) and from embedded sensors (deformation and pore pressure measurements). Different sensors, from extensometers and inclinometers to fiber optics and deformation gauges, will be installed. A multi-physical assessment of the fracture network around the intersection...

... is unavoidable, spiling and shotcrete arches are used to manage the increased squeezing rate. This paper reflects techniques that have been used to enhance safety in our travel ways by effectively monitoring and managing squeezing ground at Turquoise Ridge. metals & mining ramp rehab convergence...

... compressibility regime coefficient convergence fixed-stress split biot-willis parameter nonlinear tangent reservoir geomechanics Fluid Dynamics Simulation stability coussy equation formulation 1. INTRODUCTION Historically, reservoir flow simulators have incorporated geomechanical effects solely...

... Characterization Wellbore Design structural geology displacement halite numerical simulation wellbore closure time convergence closure time differential stress well barrier operational safety reamed interval rock salt geomechanical numerical simulation creep Simulation phole 1 in-situ temperature...

... active mining. Cutter roof formation is also prevalent in the monitored area, and the location and severity of this damage can be easily tracked. Most damage to the roof was observed after failure had occurred, but at two locations convergence was detected that has not yet resulted in failure...

... investigation into the utilization of the GRC and SRC for the design of mine pillar support systems with respect to anticipated pillar loading and opening convergence. metals & mining Ground Control international conference Morgantown Reservoir Characterization esterhuizen Upstream Oil...

... geology Reservoir Characterization Upstream Oil & Gas Thickness floor heave reservoir geomechanics immediate floor shale recovery operator panel 25 sandstone deep overburden metals & mining overburden floor failure convergence panel 26 safety geological evaluation fireclay...

... zone. A modified equilibrium equation for the ground is used and the elastic and plastic zones of the tunnel are analyzed. The results indicate that gravity and the damaged zone have significant effect on the tunnel convergence. The presented method in this paper is novel and allows the tunnel...

... ABSTRACT: Considerable stability problems, such as weakening of the rock formation and borehole convergence, can occur when drilling into areas comprising a poorly cemented formation. In this study, a laboratory-scale convergence measuring device (CMD) has been developed based on the local...

...-generated heat will keep the salt liquid for a long time, ensuring complete containment without the possibility of ground water reaching the waste. The upper part of the filled boreholes, still inside the salt dome, converges under lithostatic pressure due to salt creep, and the top part can be sealed...

... and construction schedule was planned and achieved to establish the initial design hydraulic radius to promote steady state caving. This caving strategy allowed the operation to install a number of convergence monitoring stations throughout the entire advanced strike drive development ahead of the cave...

.... Tunnel convergence measurements were compiled from 17 locations at the URL, suggesting that diametral strain is strongly influenced by the rock mass anisotropy. Monitoring of pore fluid pressure indicates strong hydro-mechanical coupling and potentially a large excavation damage zone (EDZ) up to several...

... installed in headgate entries around the stage loader and 60-m outby of the longwall face (solid). Upstream Oil & Gas reservoir geomechanics displacement fault plane horizontal displacement convergence metals & mining model 1 cross-section aa gate entry setup room numerical modeling...

.... natural gas storage Simulation numerical simulation thermally damage strength convergence cavity lux wolter Upstream Oil & Gas rock salt rock salt mass rock mass storage cavity operation construction Reservoir Characterization strength cavern design load-bearing behaviour...

... with sliding anchors in the areas where squeezing rock is present. This allows converging of the bedrock. During the convergence period a bearing ring is formed within the rock mass. Afterwards the final lining is created in reinforced shotcrete. Dimensioning of the liner is made possible only by using...

... calculation unique set joint project rock salt convergence creep constitutive model Sim Simulation borehole calculation parameter value adjustment Minkley mechanical behavior strength test thermo-mechanical behavior dilatancy determination hampel 1. INTRODUCTION Rock salt is a very...

... Characterization displacement prediction immediate roof application convergence pre-driven recovery room pillar deformation fender pillar 1. INTRODUCTION Longwall mining operations in coal mines would induce significant movements and deformations in the overburden strata. If a mine operation...

... Abstract: The employment of convergence-confinement analysis as a preliminary support design aid is an industry standard. The Longitudinal Displacement Profile (LDP), a component of the convergence confinement method [1-4], relates the normalized profile displacement to a normalized location...