... ABSTRACT The paper deals with the plane strain problem ofa shallow fluid-driven fracture propagating parallel to a free surface in an impermeable elastic rock. For a shallow fracture, the aperture corresponds essentially to the deflection of the layer defined by the free-surface and the crack...

... a standard mixing matrix). metals & mining fragment diameter Upstream Oil & Gas particle cave angle grade profile dilution free surface knowledge management mechanism drawpoint layout draw rate Rebop case study Bridgwater production level drawpoint boundary cave shape fine...

... Abstract Spalling near a free surface in highly stressed rock is an open topic in design of underground openings. Spalling is often considered as an indicator of a potential collapse mechanism such as a rock burst, and therefore, is of high importance. In this study, a hybrid discrete-finite...

... describing the transport of fines in heterogeneous porous and fractured media will be presented and compared to each other. Furthermore, we will evaluate their performance of the same set of published experimental sets of data. Fluid Dynamics isotherm free surface flow in porous media embankment...

... operations [5], remediation of contaminated soils [6], and formation of magma-driven sills [7] are examples of geo-engineering or natural processes that involve the propagation of a crack near a free surface. A particular feature of these processes is that the propagating fracture curves towards the free...

.... A comparison of the results with laboratory experiments in brittle elastic materials shows that fracture paths in rock usually do not monotonically approach the free surface. Moreover, they exhibit a high degree of non-symmetry, in contrast to experiments in glass or PMMA. An attempt to correlate crack path...

... such as accelerated deformations or build up of an undesirable stress concentration. Reservoir Characterization metals & mining reservoir geomechanics Artificial Intelligence Upstream Oil & Gas collocation point displacement parting plane variation shallow depth free surface pillar layout...

..., the rock is likely to be blocky and removable blocks should be found. The paper also presents an algorithm for finding all removable blocks along any given moving direction. The rock mass boundary can be any excavated and natural free surfaces. The algorithm works for both joint sets and for any joint...

... Upstream Oil & Gas finite block orientation displacement Imaging information rotational failure mode failure mode free surface rock face plane discontinuity identification geometry application determination rock mass rock block kinematical analysis excavation surface discontinuity...

... and free surfaces. A complete BlockTheory analysis consists of the removabilityanalysis, mode analysis and the stability analysis.The removability analysis gives a list of removableblocks that can be formed by intersecting rock massdiscontinuities and free surfaces. A removableblock is one that can move...

... opportunity to develop and test a new model of hydraulic fracture growth near a free surface. This paper presents the results of the comparison for several fracture treatments, demonstrating that the model is able to match the treatment data. INTRODUCTION Moonee Colliery is owned and operated by Coal...

... are presented and discussed in this paper. The application of two contour blasting methods (a) pre-split with a parallel free surface and Co) operational smooth blasting during the rock slopexcavation of the navigation structures at the Three Gorges Project are presented in detail. INTRODUCTION The high...

... Reservoir Characterization Upstream Oil & Gas Fluid Dynamics pore structure elastic deformation porous rock free surface experiment compaction porosity compaction zone specimen pore collapse boundary indentation compacted zone limestone refractory brick fracture Indiana...

... which could increase the permeability in the salt near the free surface, possibly providing a short circuit around seals. Extensive cracking could impinge on retrievability requirements for the waste. Changes in the crack density would change physical properties used in computational modelling. Finally...

... ABSTRACT ABSTRACT Rock failure due to high compressive stresses parallel to a free surface is important in forming borehole breakouts and when a rock surface is heated rapidly as in thermal spallation drilling. The rock breaks away in the form of thin flakes or spalls. In contrast to much...

... of support requirements corresponding to a particular excavation. INTRODUCTION The behavior of excavations in hard rocks is controlled by various kinds of discontinuities (summarily referred to as joints in this paper) that intersect the free surfaces and each other to form blocks. Some of these, donated...

... support. Reservoir Characterization metals & mining reservoir geomechanics Upstream Oil & Gas stereographic projection finite block orientation half space dimension Research Institute free surface plane discontinuous rock intersection discontinuity procedure underground...

... mechanism conical indentor borehole free surface khalaf cairo university hole depth geometry indentation test plastic zone indentation penetration high pressure gas University fineness indentor failure mechanism ANALOGYBETWEENINDENTATION AND BLASTING TESTS ON BRITTLE ROCKS. F. Khalaf...

... Characterization hydraulic fracturing Upstream Oil & Gas homalite 100 mechanism borehole wave front free surface initiation radial crack flaw fragmentation pattern S wave photoelastic investigation crack network PP wave fracture borehole vicinity fragmentation constructive interference...

... hydraulic fracturing well integrity Upstream Oil & Gas tension force cone free surface pressurization experiment axial tensile stress drillhole sandstone diameter water pressure stress raiser notch notch packer limestone fracture Indiana limestone transverse crack crack parallel...