Showing papers in "International Journal of Rock Mechanics and Mining Sciences in 2011"

TL;DR: The synthetic rock mass (SRM) model as discussed by the authors uses the bonded particle model for rock to represent intact material and the smooth-joint contact model (SJM) to represent the in situ joint network.

TL;DR: In this article, a new creep constitutive model is proposed on the basis of time-based fractional derivative, which is based on the Newtonian dashpot in the classical Nishihara model.

TL;DR: A series of simulations for hydraulic fracturing in competent rock was performed by using the flow-coupled DEM code to discuss the influence of the fluid viscosity and the particle size distribution as discussed by the authors.

TL;DR: In this paper, a Matlab tool called DiAna (Discontinuity Analysis) is used for the 2D and 3D geo-structural analysis of rock mass discontinuities on high-resolution laser scanning data.

TL;DR: In this article, the in-situ stress, pore pressure and permeability in the Southern Qinshui Basin, one of the largest coalbed methane basins in China, were investigated.

TL;DR: In this article, the authors used a digital image processing (DIP) method to obtain the proportion and distribution of the rock blocks in soil-rock mixtures (S-RM) samples.

TL;DR: In this article, a modified non-linear form of Mohr-Coulomb strength criterion has been suggested in order to overcome two major limitations of this criterion; first, it considers the strength response to be linear, and, secondly the effect of the intermediate principal stress on the strength behaviour is ignored.

TL;DR: In this article, a tool-rock system is modeled using the discrete element method, which is suitable to study problems of multiple material fracturing such as those involved in rock cutting, and the results of the 2D and 3D analyses are compared with one another, and numerical results have been compared with available experimental data.

TL;DR: In this article, an attempt was made to model rock cutting tests using Particle Flow Code in 3 Dimensions (PFC3D) to numerically predict tool forces from cutting tests in PFC 3D, and the micro-properties were calibrated by modeling the uniaxial compressive strength test.

TL;DR: In this article, a fracturing algorithm based on the Mohr-Coulomb criterion with a tensile cutoff is implemented into the numerical manifold method for footwall slope stability analysis, which can simulate the opening and sliding along pre-existing discontinuities, fracturing through intact rock, as well as kinematics of the failed slope, and can also reproduce the major failure mechanisms observed in failed slope collapses.

TL;DR: In this paper, a mathematical equation is proposed to describe the relation between hydraulic aperture and mechanical aperture by means of the ratio of the standard deviation of local mechanical aperture to its mean value.

TL;DR: In this article, a microseismic monitoring system consisting of a data acquisition unit, a data processing unit and a three-dimensional array of uniaxial accelerometers was installed in June 2009, which is the first time such a technique has been introduced into stability analysis of a high steep rock slope in China.

TL;DR: In this paper, a survey of pillar performance was carried out to identify potential modes of instability, such as spalling of the hard brittle rocks, shearing along pre-existing angular discontinuities or progressive extrusion of soft infill materials on bedding planes.

TL;DR: It is concluded that Model 7 and its resultant equation are the most precise among the seven models tested.

TL;DR: In this article, a column covering method is proposed to analyze the fractal property of the spatial distribution of acoustic emissions during the rock damage and failure process, which is consistent with the theoretical analysis.

TL;DR: In this paper, a hole is drilled in the coal seam and a gel explosive (a mining water-proof explosive) is injected into the hole to seal it, at low enough pressure to prevent cracks from forming.

TL;DR: In this paper, a strain-soften model was built by FLAC3D software to investigate the stress evolution during the process of mining the upper protective coal seam, and the results showed that the abutment stress changes rapidly within 10m in front of the coal face, and that the maximum abutments stress is approximately twice the original when the coal seam is mined 20-30m.

TL;DR: In this article, the Shuangjiangkou hydropower station in the Dadu River in China is taken as a prototype for physical model tests using a stiff modular loading frame, hydraulically applied simulated loads and in vivo excavation.

TL;DR: In this article, a two-dimensional model is presented for the initiation and growth of one or more hydraulic fractures from a well that is aligned with either the maximum or intermediate principal in situ stress.

TL;DR: In this article, the authors used a pressure transmission technique in specially designed apparatus in which confining pressure, pore pressure, and temperature are independently controlled, and measured anisotropy ratio in gas shale varies from 20% to 31%.

TL;DR: In this paper, a straight notched disk bending method was developed for mode I fracture toughness determination using rock cores, and the results were compared to the results of well-known fracture toughness testing methods.

TL;DR: In this article, a simple method based on safety threshold of vibration velocity for rock mass to restrict the damage depth of rock mass under blasting excavation is presented, according to the damage controlled method and the presented safety threshold, the remained bedrock can be simply and effectively protected during blasting excavation.

TL;DR: In this article, an analysis of in situ observations at different sites of Indian coalfields was made to visualize the development of mining induced stress over the coal pillars facing goaf line.

TL;DR: In this article, the authors investigated the fracture and joint sliding behaviors of jointed rock masses with an opening under biaxial compression through experimental and numerical analyses and found that tensile crack initiation and propagation are the dominant fracture behaviors around the hole in a low joint dip angle rock model.

TL;DR: In this article, the effect of confining stress on rock fragmentation under TBM cutters was investigated by numerical simulation. And the authors provided an explanation for the field observations, where special condition of confined stress will better facilitate fragmentation process by TBM-cutters.

TL;DR: In this article, a bit-rock interaction model for bits under rotary and percussive actions and a methodology to evaluate rotary-percussian drilling performance is presented.

TL;DR: In this paper, a mesh-free smoothed particle hydrodynamics (SPH) method is developed to simulate the failure of brittle heterogeneous materials by tracing the propagation of the microscopic cracks as well as the macromechanical behaviors.

TL;DR: In this paper, a non-conventional in situ shear test apparatus has been developed for the purpose of the present research, which ensures that the failure surface inside the specimen is free to develop in a tortuous way along block/matrix contacts, thus allowing for the evaluation of the bimrock strength parameters by taking into account the influence of the blocks and to overcome the size limitation of laboratory specimens.

TL;DR: In this paper, a three-layer, feed-forward back-propagation neural network with nine input parameters, twenty-five hidden neurons and one output parameter was trained using 116 experimental and monitored blast records from one of the most important copper mines in Iran.

TL;DR: In this paper, the authors describe ground motions induced by blasting near underground and surface concrete structures during the construction of upper Gotvand dam, and analyze the effects of different rock formations, different detonators and explosives.