Showing papers in "International Journal of Rock Mechanics and Mining Sciences in 2017"

TL;DR: In this paper, a non-linear elasto-viscoplastic model containing various deformation components is proposed, by connecting a Hooke body, a parallel combination of Hooke and plastic slide bodies, a Kelvin body, and a generalized Bingham body.

TL;DR: In this paper, a new data analysis method based on polynomial fitting was introduced to investigate the relationship between flow velocity and hydraulic gradient, and the results showed that the flow velocity versus hydraulic gradient data gradient shows a nonlinear relationship at very low hydraulic, possibly due to strong solid-water interaction, but becomes approximately linear after the hydraulic gradient is high enough.

TL;DR: In this paper, the authors developed an algorithm to process optical micrographs of rock, automatically creating binary images of the microcrack network and calculate the mean microcracks length and the number of micro-cracks per unit area.

TL;DR: In this paper, a microseismic monitoring technique is adopted to investigate the distribution regularity of coal mining induced roof rock mass along the vertical and horizontal directions in combination with mine geological data.

TL;DR: Wang et al. as mentioned in this paper designed a progressive mitigation method of rock bursts (PMMRB), which applied weak disturbance destress techniques (e.g., large-diameter drilling, water infusion) to weaken the strength and burst proneness of coal and to expand crack zones to reduce the stress concentration.

TL;DR: In this paper, the length of fracture process zones (FPZs) in the NSCB and CCNSCB tests with representative specimen geometries were theoretically estimated using the maximum normal stress criterion, and their effects on these fracture toughness tests were evaluated according to the effective crack model.

TL;DR: In this paper, the impact of shear-caused aperture changes (variable apertures and asperity contacts) and flow conditions (inertial term) upon nonlinear flow behavior is simulated by solving the Navier-Stokes equations.

TL;DR: In this paper, the authors assess the possibility of decreasing the breakdown pressure of rock and increasing the damage around hydraulic fracture by using pre-breakdown cyclic injection during hydraulic fracturing under triaxial stress conditions.

TL;DR: In this article, an experimental method is proposed to explore dynamic failure process of pre-stressed rock specimen with a circular hole, which is clearly illustrated by a high speed camera.

TL;DR: In this paper, the deformation and gas flow characteristics of coal-like materials under triaxial stress conditions were investigated using a servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane.

TL;DR: In this paper, the results of a physical experiment program undertaken in the laboratory were present in order to better understand the interaction of parallel joints and its effect on the mechanical behavior of jointed rock mass models.

TL;DR: In this article, a coupled thermo-mechanical model (termed FDEM-TM) is proposed to simulate thermal cracking of rock, which is based on a combined finite-discrete element method (FDEM).

TL;DR: In this article, the effect of gradual deterioration on the long-term stability of shallow abandoned room and pillar coal mines is investigated, and a simple quantitative approach is proposed to incorporate the effects of deterioration in numerical modelling.

TL;DR: In this paper, the effect of consolidated grouting on the mechanical behavior of fractures has been investigated and the results show that grouting is of positive effect on shear strength. But, the results do not show an increase in its shear-strength.

TL;DR: In this paper, the authors investigated the relationship between fracture geometric characteristics and hydraulic properties of a rough-walled fracture and its hydraulic properties, particularly for the deformable fractures subjected to applied stresses.

TL;DR: In this paper, a series of numerical simulations were performed to investigate the influence of side free surface on the rock fragmentation induced by single TBM disc cutter, and the critical distance for Baiyun granite is about 100mm obtained from experiments, in good agreement with that deduced from numerical simulations.

TL;DR: In this paper, the authors investigated the characteristics of multi-seam subsidence by means of several sand-plaster physical models and concluded that the panel configurations of the two seams have significant impact on the multiamach subsidence development.

TL;DR: In this article, a fully coupled three-dimensional finite-element model for hydraulic fracturing in permeable rocks is utilised to investigate the interaction between multiple simultaneous and sequential hydraulic fractures, which are modelled as surface discontinuities within a 3D matrix simultaneously accounts for laminar flow within the fracture, Darcy flow within a rock matrix, poroelastic deformation of the rock, and the propagation of fractures using a linear elastic fracture mechanics framework.

TL;DR: In this article, the multi-level amplitude cyclic loading tests of sandstone sample were carried out and the effect of confining pressure to the damage was considered. And the error of the curve fitting decreases with the confined pressure.

TL;DR: Flow paths within the fractures are largely controlled by the location and evolution of zero aperture locations, and a reduction in the number of primary flow pathways through the fracture, and an increase in their width, was observed during all shearing tests.

TL;DR: In this paper, the effect of the inclination of strata and the coal seam on the stability of surrounding rock masses is evaluated by parametric study through numerical modeling, and a case study of inclined Jarangdih new seam (10' seam) of Sawang Colliery of Central Coalfields Limited in India is presented.

TL;DR: In this paper, a 3D numerical modeling code, Rock Failure Process Analysis (RFPA), is used to investigate factors influencing hydraulic fracture re-orientation, and it is established that hydraulic fractures can be forced to propagate in desired directions if advantage is taken of the stress shadow effect in combination with knowledge of rock mass homogeneity and site far field stress conditions.

TL;DR: State Key Program of National Natural Science Foundation (SNF) as mentioned in this paper, National Natural Sciences Foundation of China (NSF) and National Key Laboratory of Geotechnical and Underground Engineering (Tongji University), Ministry of Education

TL;DR: In this paper, a 3D geomechanical model test and numerical simulation of zonal disintegration are carried out respectively, in order to reveal the formation mechanism of ZD in deep rock mass.

TL;DR: In this article, the time-dependent behavior of the Beishan granite at different T and stress level was studied, and the effect of stress on the behaviour of the granite was investigated.