Numerical Modelling Stability Analyses of Haulage Drift in Deep Underground Mines

Abstract

Mine haulage drifts are the arteries of a mine. They are used for the transportation of blasted ore from the draw point to nearby ore pass or dumping point in deep underground mines. Thus, they must be remained functional during their service life. Otherwise, their instability could lead to serious consequences such as injuries, delay of production and increased operational cost. The objective of this paper is to evaluate the performance stability of mine haulage drifts with respect to mining step adopting numerical modeling of analysis. A two-dimensional, elastoplastic, finite difference code (FLAC 2D) is built for the purpose of this study. Haulage drift performance is evaluated using stability indicators and numerical modeling results are presented in terms displacement, stress and the extent of yield zones with espect to mining step.

The damage-failure criteria for numerical stability analysis of underground excavations: A review

“…It is noted in several studies that the common practice in underground rock engineering problems relating to factor of safety (FS), is to consider the values of FS > 1 as representing the stable conditions for an underground excavation; while FS = 1, represents the critical state between stable and unstable conditions, and the values of FS < 1, is considered as "failed" conditions for the excavation (Zhang and Mitri 2008;Abdellah 2013;Itasca 2014). However, as a more conservative approach due to ever present uncertainties, the critical threshold for the factor of safety is considered to be 1.3 or 1.4 instead of unity in multiple studies (Abdellah 2015, Nuang et al, 2018Liang et al, 2019).…”

“…Literature is rich of studies using strength-to-stress ratio or the factor of safety in various domains of underground stability analysis (Zhang and Goh 2012;Idris 2014;Abdellah 2015;Shnorhokian et al, 2015Shnorhokian et al, , 2018Heidarzadeh et al, 2018aHeidarzadeh et al, , 2018bHeidarzadeh et al, , 2019Naung et al, 2018;Liang et al, 2019).…”

“…The application of stress concentration failure criterion has been addressed by different studies in numerical stability analysis of underground excavations (e.g. Kumar 2003;Zhang and Mitri 2008;Abdellah 2015;Shnorhokian et al, 2018;Abdellah et al, 2018).…”

“…5). The depth of a yield zone as a criterion to evaluate the state of failure has been extensively applied in tunnel, cavern, drift and stope stability problems (Chen et al, 1983;Zhang and Mitri 2008;Valley et al, 2010;Wei 2010;Purwanto et al, 2013;Abdellah 2015Abdellah , 2018.…”

Stability Mechanism and Repair Method of U‐Shaped Steel Reverse Arch Support in Soft Floor Roadway

“…Floor heave is one of the focuses concerned by scholars at home and abroad [1][2][3][4][5][6][7]. A series of dynamic phenomena [8][9][10][11] such as roadway instability and floor water inrush are caused by floor heave, which not only affect mine ventilation, transportation, and pedestrians but also increase a lot of maintenance workload and mining costs [12,13].…”