Total and Effective Stresses in Backfilled Stopes during the Fill Placement on a Pervious Base for Barricade Design

Zheng, Jian; Li, Li; Li, Yuchao

doi:10.3390/min9010038

Cited by 11 publications

(3 citation statements)

References 62 publications

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“…However, almost all publications on mining backfill have focused on the behaviour of a single type of backfill, including the extensive works conducted by Li and co-workers over the past two decades (Aubertin et al 2003;Béket Dalcé et al 2019;El Mkadmi et al 2014;Jaouhar et al 2018;Jaouhar & Li 2019;Keita et al 2021aKeita et al , 2021bLi et al 2003;Li et al 2005;Li & Aubertin 2012;Li 2014aLi , 2014bLiu et al 2017aLiu et al , 2017bLiu et al , 2018Pagé et al 2019;Qin et al 2021aQin et al , 2021bWang et al 2021aWang et al , 2021bWang & Li 2022;Yang et al 2017Yang et al , 2018Zhai et al 2021;Zheng et al 2019Zheng et al , 2020aZheng et al , 2020bZheng et al , 2020c. Research on the natural mixing behaviour between the waste rocks and paste backfill is absent in the literature.…”

Section: Introductionmentioning

confidence: 99%

Natural mixing behaviour of waste rocks poured in a paste backfill

Zhang¹,

Li²

2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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In underground mines, large quantities of waste rock can be produced during development in order to access ore bodies. The waste rock is typically hoisted to the surface and transported to a specific place to make a structure called a waste rock pile. This practice requires energy consumption and generates additional operating costs for transporting waste rock from underground to the surface. Alternatively, the waste rock can be poured directly into underground mine stopes filled with paste backfill. As a result, energy consumption and additional operating costs for transporting the waste rock from underground to the surface are avoided or significantly reduced. However, the natural mixing behaviour of waste rocks poured in paste backfill has never been studied. The fill mass generated by this practice can fail and collapse upon a side-exposure associated with the excavation of an adjacent stope if a poor mixture between the cohesionless waste rocks and cemented paste backfill takes place around the exposed face. Thus, it is critical to understand the mixing behaviour of waste rocks poured in paste backfill. To this end, a series of physical model tests have been performed in the laboratory. The results, in part, are presented and discussed in this paper.

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Section: Introductionmentioning

confidence: 99%

Natural mixing behaviour of waste rocks poured in a paste backfill

Zhang¹,

Li²

2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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“…Stope filling with mine wastes has become a common practice in underground mines across the world. Mine backfill can provide a safer working platform or space, improve the ground stability, increase ore recovery, reduce ore dilution, and improve the efficiency of ventilation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The use of mill tailings as backfill materials can also decrease the surface disposal of mine wastes.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Uniaxial Compressive Strength (UCS) Distribution of Hydraulic Backfill Associated with Segregation

Dalcé

Yang

2019

Minerals

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Stope backfilling with mine wastes has become a common practice in underground mines worldwide. Despite the increasing popularity in paste and rock fills, hydraulic fill made of classified mill tailings or sands remains commonly used in many mines. When such a slurried material is placed in a mine stope, a phenomenon known as segregation can take place associated with the quick drainage and consolidation of the hydraulic fill, thereby leading to a heterogeneous fill mass. While numerous publications have focused on the alleviation of segregation, there are few studies on the characterization of the distribution of geotechnical properties within hydraulic fill due to segregation. It is particularly scarce to quantify the spatial variation of the segregation and the resulting geotechnical properties after a backfill is placed in an opening. There is also a gap to quantitatively describe the degree of segregation using an appropriate expression or definition. The aim of this study is to investigate the effect of the segregation on the spatial variation of the geotechnical properties of hydraulic fill. Laboratory tests were performed with the cemented hydraulic backfill prepared with columns of different heights. The experimental results indicate that the segregation takes place and the resulting physical and mechanical properties can vary throughout the columns for samples higher than twice of the standard size. These results also indicate that the mechanical properties of a hydraulic fill obtained in a laboratory following the current practice with standard samples may not be representative of the fill mass placed in mine stopes. Expressions are proposed to quantify the degree of segregation associated with the spatial variation of particle sizes of mine hydraulic backfill.

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“…Over the years, a few studies have been reported on the analyses of pressure and stresses in backfilled stopes by accounting for the drainage and consolidation [14-18, 37, 38]. e influence of the filling rate and fill proprieties was considered [18,38,39]. Most of them focused on the PWP and stresses in the backfilled stopes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Drainage and Consolidation on the Pore Water Pressures and Total Stresses within Backfilled Stopes and on Barricades

Jaouhar

2019

Advances in Civil Engineering

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The pore water pressures (PWPs) and total stresses during the placement of a slurried backfill in underground mine stopes are the key parameters for the design of barricades, built to retain the backfill in the stopes. They can be affected by the drainage and consolidation of the backfill. Over the years, several studies have been reported on the pressure and stresses in backfilled stopes by accounting for the drainage and consolidation. Most of them focused on the pressure and stresses in the stopes, few specifically on the barricades. The effect of the number of draining holes commonly installed through the barricade has never been studied. In this paper, the influence of hydraulic properties and filling rate of the backfill, stope size, barricade location, and number of draining holes is systematically investigated with numerical simulations. The results show that the stresses in the backfilled stope and on the barricade largely depend on the filling rate, hydraulic conductivity, and Young’s modulus of the backfill. The draining holes can significantly decrease the PWP, but only slightly the total stresses on the barricades in short term.

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Total and Effective Stresses in Backfilled Stopes during the Fill Placement on a Pervious Base for Barricade Design

Cited by 11 publications

References 62 publications

Natural mixing behaviour of waste rocks poured in a paste backfill

Natural mixing behaviour of waste rocks poured in a paste backfill

Experimental Study of Uniaxial Compressive Strength (UCS) Distribution of Hydraulic Backfill Associated with Segregation

Effect of Drainage and Consolidation on the Pore Water Pressures and Total Stresses within Backfilled Stopes and on Barricades

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