Effect of blast-induced vibrations on fill failure in vertical block mining with delayed backfill

Emad, Muhammad Zaka; Mitri, Hani S.; KellyCecile,

doi:10.1139/cgj-2013-0305

Cited by 32 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value of tensile stress is very little compared with intact rock but it is too high for the backfill placed in underground mines. The location of failure in backfill is identical to the one shown by the CMS profiles reported in the literature [10,[18][19][20][21]. The contours of strength factor after dynamic analysis are shown in figure 18.…”

Section: Resultssupporting

confidence: 68%

See 1 more Smart Citation

Numerical modelling approach for mine backfill

Emad

2017

Sādhanā

Self Cite

View full text Add to dashboard Cite

Numerical modelling is broadly used for assessing complex scenarios in underground mines, including mining sequence and blast-induced vibrations from production blasting. Sublevel stoping mining methods with delayed backfill are extensively used to exploit steeply dipping ore bodies by Canadian hard-rock metal mines. Mine backfill is an important constituent of mining process. Numerical modelling of mine backfill material needs special attention as the numerical model must behave realistically and in accordance with the site conditions. This paper discusses a numerical modelling strategy for modelling mine backfill material. The modelling strategy is studied using a case study mine from Canadian mining industry. In the end, results of numerical model parametric study are shown and discussed.

show abstract

Section: Resultssupporting

confidence: 68%

“…Notably, a tensile stress zone (relaxation zone) can be seen on the top of backfill, which is an indication of backfill failure. Backfill failure has been reported at a similar location by a number of researchers [10,[18][19][20][21].…”

Section: Resultsmentioning

confidence: 75%

Numerical modelling approach for mine backfill

Emad

2017

Sādhanā

Self Cite

View full text Add to dashboard Cite

show abstract

“…Such failure mode has been confirmed by centrifuge tests performed on cemented fills (Mitchell 1986;Dirige & De Souza 2000 and field observations (e.g. Emad et al 2014).…”

Section: Failure Mode and Instability Criterionmentioning

confidence: 63%

“…In open stoping, stopes are usually divided into primary and secondary stopes to facilitate pillar recovery (Mitchell et al 1982;Pierce 2001;Emad et al 2014). The primary stope is first mined and then backfilled with cemented fill, which acts as an artificial rib pillar during extracting a secondary stope.…”

Section: Introductionmentioning

confidence: 99%

Numerical and limit equilibrium stability analyses of cemented mine backfill upon vertical exposure

Yang¹,

Li²

2017

Proceedings of the First International Conference on Underground Mining Technology

View full text Add to dashboard Cite

In open stope mines, the cemented backfill must maintain self-standing in the primary stope during the extraction of an adjacent secondary stope. A limit equilibrium solution proposed by Mitchell et al. (1982) has been widely used since the 1980s to design the exposed cemented fill. This solution has been the object of several modifications over the years. Recently, the comparison between these solutions and numerical simulations indicated that the former are not fully representative of the exposed fill when its required cohesion is relatively large. In this paper, new numerical results show that the slip surface transitions from planar at low fill cohesion to spoon-shaped at larger cohesion. In the former case, the failure is controlled by shear stresses mobilised along the planar slip surface. This is very similar to the failure mode assumed in existing theoretical models. In the latter case, however, the failure is governed by both shear (near the base) and tensile (near the top) stresses, indicating a different failure mode. Based on these observations, a new analytical solution is proposed to evaluate the stability of side-exposed cemented fill. This solution is validated using complementary simulations and the results indicate that the two different approaches agree well for typical stope geometry and fill properties.

show abstract

“…Modified plastic cap model. Monotonous yield functions that pertain to I 1 (the first invariant of the stress tensor) have been widely used in soil models, or even in cement backfill models for blast loading, for example, the Drucker-Prager [24,[48][49][50][51][52][53], Mohr-Coulomb [17,43], and Lundborg [58,59,61,[64][65][66] criteria, and so on. Although they work reasonably well at low pressures, the performance of these types of models is not satisfactory in high pressure conditions.…”

Section: 22mentioning

confidence: 99%

A coupled chemo‐viscoplastic cap model for simulating the behavior of hydrating cemented tailings backfill under blast loading

Fall

2015

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Summary Although the use of blasting has become a routine in contemporary mine operations, there is a lack of knowledge on the response of cement tailings backfills subjected to sudden dynamic loading. To rationally describe such a phenomenon, a new coupled chemo‐viscoplastic cap model is proposed in the present study to describe the behavior of hydrating cemented tailings backfill under blast loading. A modified Perzyna type of visco‐plasticity model is adopted to represent the rate‐dependent behavior of the cemented tailings backfill under blast loading. A modified smooth surface cap model is consequently developed to characterize the yield of the material, which also facilitates hysteresis and full compaction as well as dilation control. Then, the viscoplastic formulation is further augmented with a variable bulk modulus derived from a Mie–Gruneisen equation of state, in order to capture the nonlinear hydrostatic response of cemented backfills subjected to high pressure. Subsequently, the material properties required in the viscoplastic cap model are coupled with a chemical model, which captures and quantifies the degree of cement hydration. Thus, the behavior of hydrating cemented backfills under the impact of blast loading can be evaluated under any curing time of interest. The validation results of the developed model show a good agreement between the experimental and the predicted results. The authors believe that the proposed model will contribute to a better understanding of the performance of cemented backfills under mine blasting and contribute to evaluating and managing the risk of failure of backfill structures under such a dynamic condition. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Effect of blast-induced vibrations on fill failure in vertical block mining with delayed backfill

Cited by 32 publications

References 5 publications

Numerical modelling approach for mine backfill

Numerical modelling approach for mine backfill

Numerical and limit equilibrium stability analyses of cemented mine backfill upon vertical exposure

A coupled chemo‐viscoplastic cap model for simulating the behavior of hydrating cemented tailings backfill under blast loading

Contact Info

Product

Resources

About