Distinct element modelling of fracture plan control in continuum and jointed rock mass in presplitting method of surface mining

Sharafisafa, Mansour; Aliabadian, Zeinab; Alizadeh, Rezvan; Mortazavi, Ali

doi:10.1016/j.ijmst.2014.10.022

Cited by 13 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…or as separate particles bonded at contact point if modeling of discontinuities is required. In such cases, DEM [88][89][90][91][92][93], the bonded particle model [94] or hybrid methods [95][96][97][98][99] are used for numerical analysis. Typically, due to the high volume of calculations required in such methods, calculations are performed using software packages to simulate the model.…”

Section: Numerical Approachmentioning

confidence: 99%

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

et al. 2020

View full text Add to dashboard Cite

This paper presents a review of the existing models for the estimation of explosion-induced crushed and cracked zones. The control of these zones is of utmost importance in the rock explosion design, since it aims at optimizing the fragmentation and, as a result, minimizing the fine grain production and recovery cycle. Moreover, this optimization can reduce the damage beyond the set border and align the excavation plan with the geometric design. The models are categorized into three groups based on the approach, i.e., analytical, numerical, and experimental approaches, and for each group, the relevant studies are classified and presented in a comprehensive manner. More specifically, in the analytical methods, the assumptions and results are described and discussed in order to provide a useful reference to judge the applicability of each model. Considering the numerical models, all commonly-used algorithms along with the simulation details and the influential parameters are reported and discussed. Finally, considering the experimental models, the emphasis is given here on presenting the most practical and widely employed laboratory models. The empirical equations derived from the models and their applications are examined in detail. In the Discussion section, the most common methods are selected and used to estimate the damage size of 13 case study problems. The results are then utilized to compare the accuracy and applicability of each selected method. Furthermore, the probabilistic analysis of the explosion-induced failure is reviewed using several structural reliability models. The selection, classification, and discussion of the models presented in this paper can be used as a reference in real engineering projects.

show abstract

Section: Numerical Approachmentioning

confidence: 99%

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…PFC theory assumes that macroscopic rock materials are composed of many bonded microscopic particles, which is a mechanical behavior of representing macroscopic rock materials by the relative motion of microscopic particles [23,24]. PFC has the following advantages: (1) it overcomes the theoretical assumption of traditional continuum-based models [14] and (2) PFC is more suitable for simulating nonlinear deformation in rock materials and for detecting the number and evolution of cracks [25]. Two bond models are proposed based on the type of bond between particles.…”

Section: Simulation Mechanism For Using Pfcmentioning

confidence: 99%

“…Among the numerical methods that have been used to study the deformation and cracks in rock materials, the finite element method (FEM) or Fast Lagrangian Analysis of Continua (FLAC) cannot generate actual cracks, and the majority of investigations have focused mainly on studying the plastic or damaged zones [12,13]. The DEM can generate actual cracks and identify the types of cracks [14,15], but few studies have used this method to perform a quantitative analysis of the magnitude and location of the crack source. Although the detection of AE events during the deformation process in rock materials is a powerful tool for the quantitative analysis of cracks, the AE characteristics cannot be derived directly from numerical simulations [16], and therefore a new module using an independent subprogram is needed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Acoustic Emission Events of Argillaceous Sandstones under Confining Pressure

Chong

et al. 2017

Mathematical Problems in Engineering

View full text Add to dashboard Cite

At the laboratory scale, locating acoustic emission (AE) events is a comparatively mature method for evaluating cracks in rock materials, and the method plays an important role in numerical simulations. This study is aimed at developing a quantitative method for the measurement of acoustic emission (AE) events in numerical simulations. Furthermore, this method was applied to estimate the crack initiation, propagation, and coalescence in rock materials. The discrete element method-acoustic emission model (DEM-AE model) was developed using an independent subprogram. This model was designed to calculate the scalar seismic tensor of particles in the process of movement and further to determine the magnitude of AE events. An algorithm for identifying the same spatiotemporal AE event is being presented. To validate the model, a systematic physical experiment and numerical simulation for argillaceous sandstones were performed to present a quantitative comparison of the results with confining pressure. The results showed good agreement in terms of magnitude and spatiotemporal evolution between the simulation and the physical experiment. Finally, the magnitude of AE events was analyzed, and the relationship between AE events and microcracks was discussed. This model can provide the research basis for preventing seismic hazards caused by underground coal mining.

show abstract

“…A 2D dynamic commercial code was used by Sharafisafa et al in 2014 to study the pre-splitting blast method. Maximum stresses at halfway between two blastholes in 0.2 ms have been examined for blast loading, blasthole diameter, blast hole spacing ,and joint pattern [9]. Yang et al (2015) simulated numerical rock mass damage in deep tunnel excavation through the blasting method and assessed the damaged area.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Safety and the Effect of Blast Loading on the Shotcrete together with lattice girder Support of Tunnels

Basaligheh

Tabar

Nikkhah

2023

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

Damage to tunnels caused by explosions may damage the support structure and the stability. This damage is due to either blasting the working face for drilling progress or an explosion inside the tunnel. The present study investigates the dynamic parameters resulting from the blasting pattern on the temporary support structure of the tunnel considered as a lattice girder and shotcrete equivalent cross-section. For this purpose, LS-DYNA finite element software was used to assess the dynamic response of the structure to the vibration of the blasting-induced explosion. The peak particle velocity (PPV) was considered to evaluate the safety of the tunnel under dynamic loads. According to the results of this study, by exceeding the velocity of 0.9 m/s in the elements, some levels of destruction will occur. Regarding the elements of the temporary support structure of the tunnel, it is found that the damage occurs near the face and 2 m from the tunnel.

show abstract

Distinct element modelling of fracture plan control in continuum and jointed rock mass in presplitting method of surface mining

Cited by 13 publications

References 16 publications

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

Numerical Investigation of Acoustic Emission Events of Argillaceous Sandstones under Confining Pressure

Evaluating the Safety and the Effect of Blast Loading on the Shotcrete together with lattice girder Support of Tunnels

Contact Info

Product

Resources

About