... ABSTRACT: Veins, such as those contained within mudrock sequences, provide clear evidence of dilational deformation. A common explanation is that the deformation event involves high pore pressures, with low effective stress leading to natural hydraulic fracturing. The analysis here counters...

... ABSTRACT: Intrablock structures such as hydrothermal veins and stockwork have been observed to control additional or delayed development of ground failures in deep mines and tunnels. Key geomechanical parameters for excavation design are typically measured using unconfined compressive...

... Upstream Oil & Gas time window US government seismic hazard Reservoir Characterization stope seismic event sensor relative stress level asei trend vein pillar rock mass rockburst seismic activity mining area mining seismicity energy index method asei value 1. INTRODUCTION Mining...

... ABSTRACT: Limited work has progressed on strength estimation in weak veined rock (WVR) masses which are those containing networks of veins that are of low strength and have a rock block compressive strength <25MPa. In this paper, the characterization of a WVR is presented. First the WVR...

... seismic data seismic hazard stope Upstream Oil & Gas seismic event rock mass seismic activity mining vein pillar rockburst mining area seismicity energy index method asei value time window sensor relative stress level asei trend 1. INTRODUCTION Mining-induced seismicity has been...

... Upstream Oil & Gas approximation boundary condition Lee reservoir geomechanics tensile failure Simulation tensor complex reservoir drucker-prager plasticity model particle vein interface coupling fracture propagation equation discontinuity fracture interaction 1. INTRODUCTION...

.... In this earlier work, mineralized "veins" were noted to be prevalent and complicated, sometimes being shear weak interfaces while in other cases they were not. This work looks specifically at the formation mechanisms and composition chemistry of the veins, to better understand why some are planes of weakness...

... features comprised: mineral veins, fractured veins, bare fractures, slickensides, fault zones and bedding planes. All of our observations were compared with available, geophysical logging data. The most common tectonic structures are steep, rather small strata-bound fractures and veins with very low...

... Abstract: Veins generate mechanical discontinuities in shale formations due to their strength and stiffness contrast with the rock matrix. These heterogeneities in naturally fractured reservoirs can exert control on hydraulic fracture propagation path as demonstrated in experimental studies...

... layers of varying thicknesses, calcite-filled veins, and contacts between lithology changes, such as between argillaceous mudstone and mottled carbonates. The paper shows mineral and organic matter constituents of selected interfaces and suggests that interface weakness depends on certain composition...

... Reservoir Characterization Upstream Oil & Gas Artificial Intelligence strength HRZ relay zone evolution reservoir geomechanics orientation rotation vein structural geology deformation New Mexico relay zone structure shear fracture primary fault maximum extensional strain obliquity...

... Abstract The overall strength of a rockmass is determined by the intact rock strength and characteristics of the rockmass structure. In complex rockmasses this structure consists of both joints and other fractures (interblock structure) and intrablock structure such as veins. As excavations...

... Abstract: On Federal land, Gilsonite is presently being extracted by two major mining companies using simple, non-mechanized but practical mining methods. Typically the 1-6-ft (.3-2-m) wide vertical veins are extracted leaving a 35-ft (110-m) thick rich layer near the surface (crown pillar...

... Abstract: A series of unconfined and confined compression tests with acoustic emission monitoring and high resolution strain measurements was used in combination with mineralogical and micro-structural analyses to investigate the failure behavior of veined rock with large strength contrast...

... (veins) on rockmass strength. Triaxial and direct shear test data were generated numerically for a theoretical andesitic tuff using FEM. The triaxial results were applied to a deep underground mine drift design case. Direct shear results were compared to an open pit slope case. The approach previously...

... the challenges being encountered, the success of the existing system, and the new expansion. Reservoir Characterization Upstream Oil & Gas real time system stope recorder accelerometer Wallace Coeur metals & mining fiber optic line sensor seismic activity operation Magnitude vein...

... in a rockmass separately in order to both more accurately represent the strength of the rockmass and to better predict the behaviour and failure modes in an excavation. If structures like joints, bedding, and foliations are considered to be “interblock” structures, micro-defects within these blocks like veins...

... of the rock blocks in the rock mass. It focuses only on the stability analysis of a rock block once it is generated by whatever method. Isolated rock block methods have been widely used. metals & mining hydraulic fracturing Upstream Oil & Gas vein size orientation size distribution...

... ABSTRACT: Data collection to determine the characteristics of block-forming discontinuities during primary ore caving was undertaken in the production level draw points of El Teniente mine. Results from data collection of caved rock show that thick veins (= 2mm), which have less than 1/3...

... & Gas mapping dilation seismicity Reservoir Characterization sandfill thrust fault Whyatt stope extension fracture seismic event ore body metals & mining tiltmeter wall rock movement vein fracture mechanics rock burst bedding plane Rock Mechanics for Indust Amadei, Kranz...