Dr. Sharrock has 15 years industry experience in a wide range of rock mechanics positions such as Principal Geotechnical Engineer (Newcrest Mining NL), Rock Mechanics Engineer (Mt Isa Mines), Senior Geotechnical Consultant (AMC Consultants), Senior Lecturer in Geotechnical Engineering (UNSW) and Associate Professor - Caving Geomechanics (UQ).
This hands-on, virtual training course is 16 hours total, spread over four days in a 1.5-week period, and covers the analysis of embankment dams using FLAC.
3DEC offers a comprehensive set of capabilities for modeling fluid flow and the effect of fluid pressures on rock/soil. It is well known that fluid pressure in rock or soil reduces the effective stress, thereby increasing the probability of failure — either slip on joints or plastic flow of solid material. It is therefore critically important to be able to consider the effect of fluid in mechanical stability analyses.
3DEC offers different levels of sophistication for modeling fluid. The user can simply specify water pressure everywhere in the model and these pressures are used to calculate effective stresses. Effective stresses are then used in the calculations to determine if there is failure of solid material or slip on joints.
A more sophisticated analysis can be done in which fluid flow is calculated based on specified material properties and fluid boundary conditions (pressure or discharge). The fluid flow calculation can be performed on its own (uncoupled) or coupled to mechanical calculations. Fluid flow calculations can be done on the joints and/or the matrix material (blocks between the joints). Fluid pressures are continuous between the joints and the matrix such that “leak-off” from the joints into the matrix can be simulated.
3DEC also offers the ability to model the flow and mechanical effect of proppant. Proppant is assumed to be composed of small particles that are transported in the fluid with the purpose of propping open fractures at the end of injection operations. Proppant flow is calculated by assuming the proppant and fluid is a mixture with some concentration. Proppant concentration changes as a result of advection. If the concentration is high enough, then the proppant will start carrying load and will effectively prop open the host fracture. Other proppant effects considered in 3DEC include gravity-induced settling, bridging and convection.
3DEC also offers the ability to model the flow and mechanical effect of proppant. Proppant is assumed to be composed of small particles that are transported in the fluid with the purpose of propping open fractures at the end of injection operations. Proppant flow is calculated by assuming the proppant and fluid is a mixture with some concentration. Proppant concentration changes as a result of advection. If the concentration is high enough, then the proppant will start carrying load and will effectively prop open the host fracture. Other proppant effects considered in 3DEC include gravity-induced settling, bridging and convection. The proppant logic (Detournay et al., 2016) takes into account fluid-mechanical coupling and several effects are represented, such as:
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