... agency in charge of radioactive waste management in France) has performed in situ experiments at the Meuse/Haute Marne Underground research laboratory to study the gas fracturing process. Experiments have been performed at the main level of the URL at – 490 m in the Callovo Oxfordian claystone which...

... Abstract The anisotropy of mechanical properties of rocks is a well-known phenomenon in a rock mechanics. Here, we present an experimental study of the fracturing of anisotropic migmatite with plane parallel structure (foliation). Three specimens, with different dips of foliation including...

... Abstract Research on the fluid flow characteristics of fractal single fractures with different water pressure heads H , fracture widths e and fractal dimension D has been investigated, and a comprehensive index Fr coupling the three factors was proposed. The evolution of flow rate Q...

... Abstract A coupled Thermal-Hydraulic-Mechanical-Chemistry (THMC) model is developed to simulate the combined effect of fracture fluid flow, heat transfer, shearing dilation and chemical dissolution/precipitation behaviors. Fluid flow is calculated based on the cubic law and Green's function...

... by the methods based on crack theory and criteria (Griffith, 1924), (Orowan, 1950). Experimental methods including preliminary surface cracking of the sample and the succeeding deformation up to the fracture (Murakami, 1987), (Callister, 2008) cannot be applied to brittle rocks like fossil coal. That is why our...

... implication condition static fracture figure 8 Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Shock tests and some considerations Ö. Aydan, T. Ito, N. Tokashiki & S. Kodate Department. of Civil Engineering...

... elastic waves around it. This is the AE phenomenon of rock. Among the signals produced in the process of rock deformation and fracture, the mechanism of AE activity and microfracture evolution is the closest, and the statistical parameters are the most comparable with microfracture activity. Therefore...

... Abstract Tension-shear stress state is complex, which is most likely to induce rock fracture. The macroscopic fracture process of rock is initiation, growth, coalescence of micro cracks until generation of macro cracks. The purpose of this article is to understand the failure mechanism of rock...

... stages can be well characterized by strain localization based on DIC. Under static load, the fracture proceeds from primary cracks through secondary cracks to shear cracks, and the primary cracks initiate from the top and bottom locations surrounding the hole. Under dynamic load, cracks mainly initiate...

... and geological application. Tremendous progress has been made in addressing fracture behaviors of rocks or rock-like materials containing flaws. Various types of cracks or fractures emanating from flaws have been characterized and defined, based on the geometry and mechanism. Lajtai (1971) described fractures...

... Abstract The effective stress principle of Biot's consolidation theory is first introduced into deformation reinforcement theory to model directional hydraulic fracturing. The unbalanced force considering the effective stress of fluid is derived and a more effective vector type criterion...

... Abstract In the seismological monitoring of hydraulic fracturing, the characteristics of fractures determine the mechanical behavior of rock masses, particularly their main orientation, seepage, and properties of rock. Besides, the external load and boundary conditions can influence the stress...

... performed on four rock types possessing different brittle behavior and their stress-strain curves were recorded. Fracturing process of various rock types were monitored by acoustic emission sensors. Obtained results indicated that brittleness has a significant effect on the failure mechanism...

... Abstract To investigate the influence of rock property on the electromagnetic radiation mechanism of rock fracture is one of the important research fields of solid mechanics. In this study, the energy of electromagnetic radiation is introduced into the two-dimensional model of brittle fracture...

... Abstract Fracture density estimation is a challenge in discrete fracture network modeling. Among the many definitions used for fracture density, herein we consider the mean number of fracture centers per unit volume. This paper aims at presenting a geostatistical approach to estimate...

... fracture zone is mainly induced by tensile failure and the rigid joint also has great influence on rock failure which can induce different failure modes. Furthermore, there is an obvious time-dependent failure behavior on hard rocks under true triaxial compression condition. 1 Introduction The typical...

... caused by blasting or "stress-release" is limited and should be made a function of confining stress. hydraulic fracturing transition deformation fracture reservoir geomechanics confinement wombeyan marble lajtai reservoir characterization envelope residual strength correspond upstream...

... Abstract In this research, an energy entropy method is proposed to analyze crack propagation for the Brazilian split method. We used the linear parallel-bond contact model to simulate the rock specimen and the discrete fracture network in PFC2D to record the crack propagation. We built...

... Abstract Cement grouts propagation into a two-dimensional water-saturated fracture networks with different values of rheological properties are simulated by using an extended two-phase flow model. The cement grouts are typical non-Newtonian fluids that contain yield stress, which are often...

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