... is more difficult as high rates of deformation and dynamic loading are still comparatively infrequent events and the simulation of support and reinforcement for dynamic loading is more com- plex. Empirical methods of estimating excavation capacity for dynamic rock related hazards are also very poorly...

... of notches while the surface of the other one was flat and smooth. Each sample has the same depth but different width of notches. Based on the fundamental theory of SHPB test, the transmission coefficients, the deformation of rock specimens and the closure volume of joints were obtained. The experimental...

... the effects of loading frequency on the time-dependent behaviour and damage properties of rock salt under confining stress states. An axial two-stage irreversible deformation complied from the loci of minimum load of each cycle was observed, which is similar to that of conventional creep tests under static...

... efforts had been made on the improve- ment of experimental techniques to investigate the compression properties of rock joints. Previous works focused on the deformation properties, i.e. normal stiffness and tangent stiffness, of rock joint under quasi-static loading. Only a few works presented...

... hydraulic fracturing flow path fluid flow fracture geometry Reservoir Characterization fracture stiffness topology stiffness Nolte fracture specific stiffness spatial correlation Petrovitch contact area aperture distribution deformation Upstream Oil & Gas geometry fracture...

... (FEM) and Boundary Element Method (BEM). The other is based on discontinuous material model, like Discrete Element Method (DEM) and Discontinuous Deformation Analysis (DDA). However, for structural analysis, we usually need to follow the behavior of structures from small deformation to crack initiation...

... burst prevention. Reservoir Characterization strength experiment soft rock compression Engineering stress wave dynamic loading constitutive model structural geology rock element transmission bar loading strain rate deformation rock sample element mechanics Upstream Oil & Gas...

... ABSTRACT: The specimens under the conditions of uniaxial compression, different gas-pressure conditions (0.0, 0.5, 1.0, and 1.5 MPa), sample strengths, deformation, energy, count of acoustic-emission signals, and laws influenced by gas pressure were investigated by self-developed equipment...

... uniaxial tension of sylvinite and uniaxial compression of granite. Tensile experiment showed the existence of equidistant zones of strain localization and deformation activation of one of zones at the stage of macrofracture initiation. For uniaxial compression tests of granite, it has been found...

... ABSTRACT: This paper presents an innovative bolt which has the Negative Poisson's Ratio effect (NPR bolt). The NPR bolt can absorb energy and sustain high constant resistance and large deformation. The working principle of this new type of bolt is introduced and a series of dynamic laboratory...

... ABSTRACT: Impact cratering is a fundamental geological process in the solar system. The formation of impact craters is a highly dynamic and complex process that subjects the impacted target rocks to numerous types of deformation. The impact process can be subdivided into three subsequent...

... of the size and the amount of the components of the model based on the conditions of deformation in fault zones, as shown in Figure 5. For NPP the size of the maximum element of the model is determined by the size of the NPP site and is defined here as three kilometers. Figure 1. The dependence of magnitude...

... metals & mining coal reservoir geomechanics tectonic movement Reservoir Characterization Upstream Oil & Gas stress control stability monitoring multi-scale characteristic burst tendency rock mass structural geology characteristic roadway China rockburst deformation...

..., the safety and stability of existing tunnel reconstruction is one of the leading research topics in geotechnical engineering. rock fragmentation numerical simulation numerical calculation method vibration reservoir simulation expansion tunnel collapse cavity reconstruction deformation...