Mechanics and response of a surface rock block subjected to pressure fluctuations: A plucking model and its application

Numerical investigation of the scale effect and anisotropy in the strength and deformability of coal

“…By testing the SRM specimens, the failure mechanisms of rock mass can be observed in detail and mechanical properties such as the strength, stiffness and brittleness of a rock mass can be estimated. The SRM approach has been successfully utilized for evaluating rock mass mechanical properties of site specific cases Cundall et al, 2008;Esmaieli et al, 2010;Grenon et al, 2014;Mas Ivars et al, 2011;Pettitt et al, 2011;Pierce et al, 2007;Vallejos et al, 2013;Vallejos et al, 2014;Zhang et al, 2011), and also the effects of pre-existing discontinuities on rock mass behaviour (Bahaaddini et al, 2013;Chiu et al, 2013;Lambert and Coll, 2014;Pan et al, 2014;Scholtès and Donzé, 2012). For Coal Measures, Deisman et al (2010) used the SRM approach to investigate the effects of fractures or joints on the geomechanical properties of coal and showed that the SRM method is capable of simulating the strength and deformation of a coal seam.…”

Uncertainty analysis of impact indicators for the integrity of combined caprock during CO2 geosequestration

“…The final optimum experimental parameters were calculated using the Design-Expert numerical optimization function, which allows for a compromise among the various responses. This function searches for a combination of factor levels that jointly optimizes a set of responses by satisfying the requirements for each response in the set (Pan et al, 2014). The optimization was accomplished by obtaining the individual optimum for each response and combining the individual optima to obtain a combined or composite optimum 6.…”

Plucking phenomena in nonuniform flow

“…Engineering studies of plucking are considerably more developed. Under impinging jets in plunge pools, rock blocks are removed by "impulsive erosion" (Bollaert and Schleiss, 2005) wherein pressure fluctuations (e.g., Liu and Li, 2007;Pan et al, 2014;Li et al, 2016) weaken blocks by extending fractures (Annandale, 1995;Bollaert, 2002;Schleiss, 2003, 2005;Pan et al, 2014) and then amplify within the fractures (Bowers and Toso, 1988;Bollaert, 2016) to ultimately lift blocks (Liu and Li, 2007;Peiqing and Aihua, 2007). In the "accumulative plucking" model of Li et al (2016), joint walls clamp back down on a block and allow repeated occurrences of minor uplift to incrementally lift the block out of place.…”