ABSTRACT Underground mining in mountainous regions presents a significant geological hazard, characterised by the occurrence of land subsidence and movement overlying strata. To aggrandise theory mine rock mechanics, we conducted systematic investigation into deformation failure mechanisms strata as well patterns surface regions. With method engineering mechanics theoretical analysis, supplemented universal distinct element code (UDEC) numerical simulation, status Songzao was simulated...

The safety production of gold, silver, copper, and other important metals is seriously threatened in the process mining from open-pit to underground due various factors such as infiltration caused by rainfall unloading during mining. Furthermore, current situation an increasing number mines presents a high steep terrain, which poses significant security risks. Accordingly, it great practical significance investigate failure mechanism high-slope angles ensure long-term safe mines, considering...

Abstract The mechanical behaviors of shales with transversely isotropic characteristics under dynamic loading have great significance for structural instability in geotechnical engineering. To understand the effect transverse isotropy on deformability and tensile strength subjected to loading, a group impact Brazilian tests were carried out shale specimens via split Hopkinson pressure bar (SHPB) testing system. High-speed digital image correlation technology was applied monitor fracture...

This research examines how rainfall and mining affect the slope damage resulting from transition open-pit to underground mining. Using an unmanned aerial vehicle (UAV), Huangniu of Dexing Copper Mine was fully characterized, experiments were conducted on rock samples appropriate sites. First, mechanical properties measured. Then, parameters similarity simulation derived based theory. Subsequently, rainfall, slope, data acquisition, monitoring systems designed. Finally, mass failure with...

As coal mining depths increase, rockbursts pose a significant threat to the safety of mine operations. Addressing challenge safely and steadily advancing excavation faces amid rockburst hazards, this study assesses current state reinforcement support technology for rockburst-prone roadways. It scrutinizes concept roadway anti-rockburst hydraulic support, design, integration with surrounding rock mass. The research delineates key directions enhancing systems, including mechanical mechanisms...

Multiple problems, including high computational cost, spurious local minima, and solutions with no geologic sense, have prevented widespread application of full waveform inversion (FWI), especially FWI seismic reflections. These problems are fundamentally related to a large number model parameters the absence low frequencies in recorded seismograms. Instead inverting for all dense model, image-guided inverts sparse space that contains far fewer parameters. We represent set values, from these...

To understand the complex deformation features and failure mechanisms of expanded polystyrene (EPS) concrete reveal composite effect beads polypropylene fibers, a series experiments were conducted on poured EPS specimens. Meanwhile, cloud computing system for 3D realistic process analysis (RFPA3D) was established to model fine real structure. The micromorphology specimens obtained via CT scanning further processed using digital image processing technology. Otsu algorithm applied...

To understand the fracture features of zonal disintegration and reveal failure mechanisms circle tunnels excavated in deep jointed rock masses, a series three-dimensional heterogeneous models considering varying joint dip angles are established. The strength reduction method is embedded RFPA to achieve gradual process, macro mode safety factor, reproduce characteristic phenomenon i.e., disintegration. mechanical acoustic emission energy surrounding rocks during different stages whole...

This research introduces a novel implicit continuous to discontinuous method investigate the cross-scale failure process of rock masses, including fine fracture creation, propagation, and rigid block contact. enables an intact split crush, with local deformation/movement propagating rapidly throughout whole system. The was applied progressive slope failure. results revealed that number elements within increased at primary stage. upper part band gradually shifted upward backward towards...

To reveal the size effect and lateral pressure of columnar jointed basalts (CJBs), meso-damage mechanics, statistical strength theory, continuum mechanics digital image correlation are combined, a series heterogeneous numerical models CJBs orthogonal parallel to column axis established. The elastic modulus, Poisson's ratio, uniaxial compressive strength, friction angle, residual coefficient, heterogeneity index 60 GPa, 0.2, 120 MPa, 56.15°, 0.1 5, respectively. gradual fracture processes...

Abstract An indirect testing method for determining the tensile strength of rock-like heterogeneous materials is proposed. The realistic failure process analysis method, which can consider material inhomogeneity, applied to model square plate containing a circular hole under uniaxial compression. influence thickness and loads on maximum stress investigated, equation deduced. Meanwhile, initial cracking are obtained by corresponding physical tests, strengths determined substituting into...

Abstract We studied the non-linear mechanical response and failure mechanism of columnar jointed basalts (CJBs) with transverse joints by modeling meso-mechanics, statistical damage theory continuum mechanics. The anisotropy shape effect CJBs were captured under different lateral pressures. digital images transformed into heterogeneous element meshes, gradual fracturing process various modes reproduced. compressive strength (CS) equivalent deformation modulus (EDM) parallel perpendicular to...

The dynamic anisotropy and failure mechanism of shales are greatly affected by bedding surfaces.To reveal the influence beddings on anisotropic characteristics under impact, Brazilian splitting tests were conducted split Hopkinson pressure bar system.The fracturing process monitored high-speed camera.Meanwhile, to understand crack initiation propagation mechanism, stress buildup, shadow transfer modelled based digital image processing rock analysis method.The effect dip angle spacing...

We studied the formation and evolution mechanism of polygonal cracks on rock surfaces under cooling by modelling meso-damage mechanics, continuum mechanics thermodynamics. Factors that affect surface damage include ambient temperature, lithology difference boundary restrictions. established simulated a heterogeneous model with weak layer for three types boundaries. These were biaxial constraint, uniaxial constraint free boundary. The initiation propagation reproduced varying thickness...

Considering that the mechanical mechanism and energy release law of gradual failure columnar jointed basalt (CJB) are affected by lateral pressure, rock heterogeneity column irregularity, etc., numerical CJB models with various dip angles, irregularity degrees pressures were established through digital image correlation. The progressive process released CJBs simulated under loading rate 0.05 mm/step based continuum mechanics statistical damage theory. influences inhomogeneity, degree, model...

The progressive collapse behavior and energy release of columnar jointed basalts (CJBs) can be greatly influenced by different joint distance ratios. By adopting the digital image correlation, a series heterogeneous CJB models are established. continuous fracture process acoustic emissions (AEs) captured numerically under varying lateral pressures. load curves ratios model boundaries analyzed. Meanwhile, strength, deformation modulus AE rule discussed. data indicate that plane strain,...