Required strength estimation of a cemented backfill with the front wall exposed and back wall pressured

Liu, Guang Sheng; Li, N.A.; Yang, Xiaobo; Guo, Lei

doi:10.1504/ijmme.2018.091214

Cited by 23 publications

(13 citation statements)

References 39 publications

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“…Dirige and De Souza 13 have shown that the displacement can sometimes provide useful information on the state of the backfill even though they did not evaluate the critical (minimum required) strength of sill-mat. Recently, Yang et al 27,28 and Liu et al 29 have shown that the subjectivity in assessing the stability or instability of structures (barricade and side-exposed backfill) can be reduced by monitoring the displacements at some critical points. In this study, the total displacement at the bottom (center Point X for vertical stopes; see Fig.…”

Section: Instability Indicator Of the Sill-matmentioning

confidence: 99%

Numerical investigation of the stability of a base-exposed sill mat made of cemented backfill

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Yang

et al. 2019

International Journal of Rock Mechanics and Mining Sciences

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Section: Instability Indicator Of the Sill-matmentioning

confidence: 99%

Numerical investigation of the stability of a base-exposed sill mat made of cemented backfill

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Yang

et al. 2019

International Journal of Rock Mechanics and Mining Sciences

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“…To validate the proposed solution for apparent interface stiffness and investigate their influences on backfill stress distributions in stopes of two most widely used mining methods, numerical models were built with FLAC3D, which is a finite difference program using an explicit Lagrangian calculation scheme and a mixed discretization zoning technique. It is a well-adapted tool for handling geomechanical problems, including excavation and backfilling of mine stopes [3,8,9,15,19,[25][26][27][28].…”

Section: Numerical Simulations and Results Analysismentioning

confidence: 99%

“…Mining with backfill is used to extract valuable minerals as much and safe as possible by filling underground voids with mine wastes (tailings, waste rocks) and/or binders. e backfill in stopes can provide steady working platform, increase ore recovery, and improve ground conditions in mining processes [1][2][3]. e consumption of the mine wastes for backfill is also beneficial for the environmental protection of mine communities, which has accelerated the development and utilization of the mining methods world widely [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Stiffness Determination of Backfill‐Rock Interface to Numerically Investigate Backfill Stress Distributions in Mine Stopes

Liu

Yang

Guo

2021

Advances in Civil Engineering

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Numerical modeling is an effective and efficient method to investigate the stress distributions of backfill in stopes, which should be well understood in underground mining. Interface elements between backfill and rock in simulated stopes had been proved to be essential components, for which the stiffness parameters need to be assessed and assigned. However, few reports have revealed the effects of interface stiffness on backfill stress distributions, and there is not yet a clear solution to determine the interface stiffness to simulate stresses in backfilled stopes, except an empirical method for simply applying a high value suggested in FLAC manual. In this study, a new solution is first proposed to determine the normal stiffness and shear stiffness of interface elements, respectively, in numerical modeling of backfill stresses. The applicability of the solution has been verified by investigating backfill stress distributions in mine stopes of two widely used mining methods with variable stiffness values. The results show that the newly proposed method leads to totally the same backfill stress distributions with models applying the interface stiffness by the method in FLAC manual based on a “rule-of-thumb” but will save at least 20%–30% calculation time to improve modeling efficiency under the same simulation conditions and will carry much clear physical meanings corresponding to the interaction between backfill and rock walls in mine stopes. In addition, the vertical and horizontal stresses show good agreements with the analytical stresses predicted by the Marston equation under the at-rest state, which validates the reliability of the proposed solution for interface stiffness. Moreover, the plotting methods of stress distributions and the coefficient of lateral earth pressure of backfill in simulated stopes with proposed interface stiffness were discussed to further clarify the reasonable methods to investigate the backfill stresses in mine stopes, especially after considering the effects of the convergence from rock walls, which is a very significant and common phenomenon in practical mining engineering.

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“…However, the research on the influence of these factors is still ongoing [3,4,35] and cannot be quantified easily in laboratory modelling and numerical modelling. And to assess the validation of the proposed method, numerical modelling was proved to be an effective way Advances in Civil Engineering 7 [2,11,12,21,33,[36][37][38][39][40][41]. To assess the stability of the backfill using 3D numerical simulations was proved to be effective [2,[28][29][30][31][32].…”

Section: Verification With Numerical Modelingmentioning

confidence: 99%

A Strength Design Method of Cemented Backfill with a High Aspect Ratio

Wang

2020

Advances in Civil Engineering

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To calculate the required strength of a cemented backfill with high aspect ratio, the confirmation of lateral pressure is fundamental and needs to be determined first. As for the backfill with a high aspect ratio of height to length, the shape of the slip surface is not straight when in the active state due to the limited space, which is different from the general backfill. For this reason, a formulation of the slip surface with a curved shape and a lateral pressure calculation method based on this curved slip surface were proposed. The proposed equation of the slip surface is affected by the geometry parameters of the backfill, internal friction angle of the backfill, and the friction angle of the backfill-rock interface. Then, by the combination of the minor principal stress trajectory method and the horizontal slice method, an ordinary differential equation of stresses was established and then solved numerically. Finally, the method based on Mitchell’s three-dimensional limit equilibrium model was used to calculate the required strength of the cemented backfill. The calculated results were compared with previous studies and validated with numerical models. The results showed good consistency for the backfills with high aspect ratios.

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Required strength estimation of a cemented backfill with the front wall exposed and back wall pressured

Cited by 23 publications

References 39 publications

Numerical investigation of the stability of a base-exposed sill mat made of cemented backfill

Numerical investigation of the stability of a base-exposed sill mat made of cemented backfill

Stiffness Determination of Backfill‐Rock Interface to Numerically Investigate Backfill Stress Distributions in Mine Stopes

A Strength Design Method of Cemented Backfill with a High Aspect Ratio

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