Engineering Center for Safe Mining Technology Under Complex Geologic Condition

Guiyang, China

Engineering Center for Safe Mining Technology Under Complex Geologic Condition

Guiyang, China
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Zhang Y.,Guizhou University | Zhang Y.,Guizhou Engineering Laboratory of Mineral Resources | Zhang Y.,Engineering Center for Safe Mining Technology Under Complex Geologic Condition | Zuo Y.-J.,Guizhou University | And 2 more authors.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

The numerical tests were run with a Rock Failure Process Analysis code, F-RFPA2D, incorporated with a Flow-Stress-Damage coupling model (FSD). By numerical simulation of failure process of rock sample containing two pre-existing closed flaws under different directions of hydraulic pressure, to investigate the crack initiation and propagation. This will be conducive to the understanding of crack extension in fractured rock mass, rock damage fracture coalescence mechanism, explicit interaction with the seepage mechanism. The simulated results reveal that the confining pressure can cause the transition from tensile rupture mode to shear fracture mode, and vice versa for seepage. When the water pressure gradient direction and the external load direction are the same, the flow of water will promote crack propagation along the flow direction; when the two are in the opposite direction, the crack will transit from compressive stress mode to tensile stress mode and the rock mass is more prone to rupture. ©, 2015, Northeastern University. All right reserved.


Zuo Y.-J.,Guizhou University | Zuo Y.-J.,Guizhou Engineering Laboratory of Mineral Resources | Zuo Y.-J.,Engineering Center for Safe Mining Technology under Complex Geologic Condition | Jia P.,Northeastern University China | And 2 more authors.
Advances in Mechanical Engineering | Year: 2013

Three-dimensional numerical tests have been conducted to investigate the failure process of surrounding rock mass around circular and U-shaped tunnel at depth. Different failure modes of deep underground openings have been reproduced. The influence of different shapes and sizes of tunnel section, as well as the direction of the maximum principal stress, on zonal disintegration was analyzed. Numerical simulations show that failure modes and load-bearing capacity of tunnel depend on the direction of the maximum principal stress. The zonal disintegration around deep underground openings is a phenomenon that only occurs under some special conditions. Firstly, there must be a higher horizontal tectonic stress along the axial direction of tunnel; secondly, the radius of curvature of tunnel should be large enough to induce the tensile stress higher than tensile strength of rock mass. Therefore, the direction of tunnel axis as well as the direction and the size of tectonic stress should be carefully considered during tunnel design. © 2013 Yu-Jun Zuo et al.


Zuo Y.-J.,Guizhou University | Zuo Y.-J.,Guizhou Engineering Laboratory of Mineral Resources | Zuo Y.-J.,Engineering Center for Safe Mining Technology under Complex Geologic Condition | Zhang Q.,Guizhou University | And 10 more authors.
Shock and Vibration | Year: 2015

By using numerical code RFP A 2 D (dynamic version), numerical model is built to investigate the failure process of rock particle under impact loading, and the influence of different impact loading on crushing effect and consumed energy of rock particle sample is analyzed. Numerical results indicate that crushing effect is good when the stress wave amplitude is close to the dynamic strength of rock; it is difficult for rock particle to be broken under too low stress wave amplitude; on the other hand, when stress wave amplitude is too high, excessive fine particle is produced, and crushing effect is not very good on the whole, and more crushing energy is consumed. Secondly, in order to obtain good crushing effect, it should be avoided that wavelength of impact load be too short. Therefore, it is inappropriate to choose impact rusher with too high power and too fast impact frequency for ore particle. © 2015 Yu-Jun Zuo et al.

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