... Abstract Firstly got the rock specimens with intrinsic fracture, then carried out seepage tests with high seepage pressure (>1MPa), in order to study the seepage regulation with different seepage pressures and confining pressures. The result stated that the relation between coefficient...

...;Yumlu 2001; Caceres Doerner 2005). metals & mining Displacement Contour CRF stope sudden loss knowledge management Simulation contour loading Canada strength vertical stress contour sublevel fracture stope confinement MPa secondary stope tensile stress development Rock...

... and fracture is an energy dissipation irreversible process, so stress analysis can not reflect the law of rock failure. Rock may be failure in a stress range, stress is not the essence factor which token strength of rock. The token of rock strength must be considered from the energy dissipation and analyzed...

... Abstract The objective of the study was to investigate the effect of strength heterogeneity on fracture patterns observed under laboratory conditions in hollow cylinder fracturing tests. The finite-element method with cohesive elements representing potential fracture sites was used. The number...

... Abstract Non-Newtonian fluids are common in drilling and oil production. Examples include drilling fluids, heavy oils and fluids used in hydraulic fracturing. A review of the state of the art indicates that our current knowledge of non-Newtonian fluid flow in rough-walled fractures...

... an experimental investigation on the internal microscopic processes that soil-rock mixture (SRM) fractures, damages and breaks when subjected to a uniaxial compressive load through the on-site CT scan and the digital image processing techniques. A novel digital image processing algorithm was developed to extract...

... Abstract The surface damage and evolution of gouge materials in rock fractures or faults undergoing shear can change fracture properties in terms of shear strength and dilation, fluid transmissivity and retardation for contaminants. In order to conceptually understand fracture surface damage...

... source that was used on the tunnelwall and floor. Fractures were imaged couple of hundred meters away from the tunnel. The location of the target features was achieved by using 3-component receivers, two parallel source lines and 3D vector migration schemes. IP (Image Point) migration was found...

... shear experiment funding organisation support Switzerland Reservoir Characterization Upstream Oil & Gas ijrmm special issue decovalex 2015 displacement rock mass fracture particle barrier system biosphere rock fracture repository Rock Mech evolution Rock Characterisation...

... Abstract This paper presents a comparison between natural and stochastic fracture systems in terms of their geomechanical response to in-situ stresses. An analogue fracture network (AFN) is extracted from the geological map of a limestone outcrop. A corresponding discrete fracture network (DFN...

...) to facilitate interpretations and digital measurements of fractured rock masses, especially their structural geological patterns. As a case study, the technologies have been applied to the fracture pattern assessment at the Ricobayo dam site. Introduction In the context of rock engineering, principles...

... progressive process and resultant fragment flow, and may be a valuable numerical tool for optimizing the design of rock cutting and drilling equipments. Introduction Rock failure has important applications in mechanical excavation, rock blasting, hydraulic fracturing and geostructure instability...

.... Failure of brittle hard rocks is a gradual process, which involves microcrack initiation, propagation, and coalescence. Because of the randomness of joints and fractures of the rocks, a failure may be occur from the propagation of the initial cracks and faults under external loading, and the traditional...

...-solute transport processes of rock fractures. The focuses are put on stress and shear induced fluid flow anisotropy, transport pass channeling, and impact of considering different retardation mechanisms in single fractures of crystalline rocks, typically granites, due to its importance...

... strength degradation of granite under constant loading were studied. AE technique was used to study the development of fracture during these tests. For the numerical simulations, the discrete element method was adopted to carry out numerical tests to simulate the laboratory tests. A same set of tests were...

... Abstract The naturally existing fractures in a rock mass induce heterogeneity and anisotropy for its engineering properties, resulting in difficulties for investigation on hydrogeological characteristics of fractured rock masses. Aiming to gain more insight into the difference of permeability...

... Abstract The process of fluid flow in rock fractures involves complicated dynamical behavior of fluids, and its modeling is a challenge to numerical methods. In this paper, the Smoothed Particle Hydrodynamics (SPH), a particle method based on Lagrangian formulation, is employed to simulate...

... Abstract Seepage tests under constant triaxial compression stresses were conducted on single granite fractures selected from Beishan with the groundwater in Beishan site as the seepage fluid. Ion concentrations of Al 3+ and SiO 2 in the exit solution were measured during the seepage tests...

... Abstract Fracture pressure in traditional wellbore stability analysis is based on tensile failure. When the drilling fluid density is high, there is not only tensile fracture but also shear fracture may occur on the wellbore wall of horizontal wells. The possible fracture modes of horizontal...

... Abstract Combined the modeling technique of random fractured network with discrete numerical method analyzing the rock permeability including two orthogonal fractures, the results proved the feasibility of the numerical methods. And then, a series of numerical experiments were conducted...