Jinfei Chai

University of Toronto | U of T · Department of Earth Sciences

In order to determine the internal relationships among seismic wave velocity, axial pressure, and rock porosity, the rock samples taken from NRS170143 borehole of the Nickel Rim South mine are tested using a Hoek type triaxial cell equipped with axial linear variable differential transducers (LVDTs) and a data acquisition module. The empirical expr...

Taking the Muliashi north open-pit mine in Zambia as a case study, the failure mechanism of rock slope with intermittent bedding joints was investigated from a meso mechanical viewpoint using particle flow theory and PFC2D software. In the rock slope model, the rock block and joint were represented by bonded-particle model and smooth-joint model, r...

During the process of earthquake and rock fracturing, the fracture mechanisms, source parameters and rupture energy can be obtained by moment tensor inversion. In this paper, the moment tensor theory and its inversion method are introduced in detail; and then a comparison of merits and demerits about three major inversion methods, namely the absolu...

Based on the moment tensor theory and the P-T diagram, the rock failure mechanism under uniaxial compression condition was revealed. Large numbers of acoustic emission data in the process of generation, propagation and coalescence of cracks were simulated by particle flow code (PFC). The fracture parameters and their evolution such as spatial posit...

Based on moment tensor theory, P-T diagram method and T-k diagram method, the fracture parameters and their evolution such as spatial position, fracture azimuth, fracture types, stress state and moment magnitude were analyzed to reveal the rock failure mechanism of triaxial compression under the condition of different confining pressure with a larg...

According to experimental data of joint normal cyclic loading/unloading, joint normal stiffness expressions are gained from hyperbolic function and semi-log function respectively which are used to fit joint normal stiffness-closure curves. These expressions are implemented into continuously yielding joint model and cyclic loading/unloading programs...

To achieve the effective monitoring of rock failure events in the mine water inrush inoculation process, a moment tensor inversion method based on digital seismology was introduced to process abnormal microseismic events monitored in Hebei Fanshan Phosphate Mine. The vibration displacement field in the mine scale could be expressed as the convoluti...

Using the theory of particle flow (PFC) and the method of moment tensor inversion and T-k parameter, this study simulated the uniaxial compression test of rock and analyzed the acoustic emission data in the process of rock failure. Through deducing the rock fracture parameter and fracture type in the process of failure breeding, development and bre...

This research simulated the uniaxial compression test of rock using the theory of moment tensor, PFC(granular flow) and the method of P-T distribution diagram, analyzed the acoustic emission data in the process of rock failure. Through deducing the rock fracture parameters and fracture azimuth in the process of crack breeding, development and break...

An accurate description of the mechanical properties of jointed rock mass is critical for safe design, construction, and operation in rock engineering. The equivalent rock mass (ERM) technique is used to study the mechanical properties of jointed rock mass in the Bayan Obo eastern open-pit iron mine in China. This technique uses the bonded particle...

In recent years, the slope sliding accident not only becomes a major hidden dangers of mine safety, but also causes a huge impact to the normal production of mine. At present, the traditional slope monitoring and early warning methods are difficulty to solve the problem of monitoring and early warning of the long-term landslide mass such as the slo...