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Keywords: fractured rock
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1130
.... To investigate the mechanical characteristics and failure processes of fractured rocks containing a flaw, four models with different fracture numbers were established based on the discrete element method, two contact models were used to describe the mechanical behaviors of fractures and rock matrix...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1098
... assessment of subsurface engineering activities. Alongside with lithological factors, the physical properties of fractured rocks are controlled by their internal geometries. For single fractures, the implicit linkages between fracture flow and elastic responses via their aperture distribution has been...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1784
.... Poisson ratio also increase with increasing damage. We modeled the volumetric strain of the sandstone specimens using a Perzyna viscoplasticity law that employs the Modified Cam Clay model as the yield criterion (Haghighat et al. 2020). We deduced that fractured rocks undergo substantial bulk time...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1123
... ABSTRACT: A novel experimental immiscible displacement test was designed to estimate the residual oil saturation in the vuggy-fracture and pseudo-matrix system, in a full diameter fractured rock sample. It is possible to determine the residual oil saturations in the fracture-matrix system...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0067
... of axial stress or pore pressure transient disturbances. Based on the experimental results, both types of stress disturbances showed an increasing effect on the permeability for fractured rocks. However, only the pore pressure disturbances showed an increasing effect for intact rocks. It can be estimated...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0118
... ABSTRACT: Excavation in the complex geological structure often accompanies with water-inrush accidents, which is considered to be resulted from mass migration and loss in fractured rock in the seepage process. When granular matters migrate and lose, the grain size distribution (GSD) changes...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-557
... ABSTRACT: We conduct combined numerical and mathematical analysis to investigate the variability of local stresses in heterogeneous fractured rocks subjected to different far-field stress loading conditions. A realistic fracture network is constructed based on a sandstone outcrop mapped...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-770
... in deformable fractured porous media are then derived. Finally, current limitations and possible further extensions of the model are discussed. flow in porous media fractured porous media fractured rock Upstream Oil & Gas tensor Fluid Dynamics formulation anisotropic poroelastoplastic...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0439
... ABSTRACT: In order to assess the dynamic, coupled geomechanical and hydraulic response of a highly fractured rock during/after excavation, it is important to quantify the changes in the connectivity and conductivity of the fracture system. The objective of the work is to explore the seepage...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0321
... ABSTRACT: We improved our thermal-hydraulic-mechanical-chemical (THMC) simulator to predict the long-term permeability change of the fractured rocks. The model evaluates the influence of the geochemical reaction on the evolution of the permeability in fractured rocks by considering pressure...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-878
... Abstract: Deep fluid injection (DFI) into fractured rock is used as a disposal method for manufacturing waste water, produced water from oil/gas and geothermal development, and other waste streams. Fluids are typically injected at high pressures and at rates up to tens of barrels per minute...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-586
... bed that exhibits a ladder structure consisting of a “through-going” joint set abutted by later short fractures. Geomechanical modelling of the fractured rock is achieved by the 3D finite-discrete element method (FEMDEM), which can capture the deformation of matrix blocks, the variation of stress...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-717
... to model typical behavior of the drift at the MPBX location. The Discrete Fracture Network (DFN) approach is commonly used for joint generation in numerical models to simulate the behavior of fractured rock in an underground mine. The Discrete Fracture Network approach is well established and used...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-228
... Abstract The authors conducted the in-situ gas-tightness tests in a fractured rock at the Namikata underground LPG storage construction site in Ehime prefecture, Japan. The test consisted of two independent setups, a gas-tightness test that used boreholes, and a chamber-scale test that used...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-542
... Abstract Fluid flow in fractured rock is controlled by flow paths in a network of discrete pre-existing fractures. The same can be said for fracture networks induced by loading or unloading. In both cases, or in the combined case, the determination or evolving modification of an equivalent...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7201
... Abstract Fluid flow in fractured rocks has been a very difficult problem that has stymied many workers. A major cause of this problem is the disconnect between the geology of fractured rocks and the assumptions of Darcy’s Law. Darcy’s Law is based on the average permeability over a uniform...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-293
... ABSTRACT: Propagation of elastic waves in fractured rocks is investigated, both theoretically and experimentally. Mechanical properties of microfractured rocks have been characterized from the computation of seismic velocities. Published experimental studies indicate that normal and shear...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-164
...1. INTRODUCTION The stress-strain relationship is fundamental for modeling mechanical deformation and the associated coupled processes in porous and fractured rock. Hooke s law has been generally used to describe this stress-strain relationship for elastic mechanical processes. Hooke s law...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-576
... ABSTRACT The propagation of elastic waves in fractured rock is investigated, both theoretically and experimentally. However mechanical properties of fractures rock can be estimated from the computation of seismic velocities. Fractured rock parameter as the unconfining compressive stress c s...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-254
... ABSTRACT: A model is presented to represent changes in the mechanical and transport characteristics of fractured rock that result from coupled mechanical and chemical effects. The specific influence is the elevation of dissolution rates on contacting asperities which result in a stress...

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