A New Analytical Solution for the Stress State in Inclined Backfilled Mine Stopes

Jahanbakhshzadeh, Abtin; Aubertin, Michel; Li, Li

doi:10.1007/s10706-017-0171-6

Cited by 27 publications

(14 citation statements)

References 24 publications

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“…It can be seen that Kps changes gradually from K0 near the center to a value close to Ka near the walls; this variation is due to the frictional shear stresses developing along the rock walls, which affect the magnitude and orientation of the principal stresses. Figure 10 also indicates that the values of K remains close to K0 across the opening width; this is in agreement with the simulations results obtained by Jahanbakhshzadeh et al [32]. Table 1).…”

Section: Numerical Results Obtained With Interface Elementssupporting

confidence: 90%

“…Previous investigations have shown that the finite difference code FLAC [37] can be used to help assess the behaviour of backfilled stopes [21,22,31,32,35,36,[38][39][40]. Figure 1 shows the reference FLAC model of a backfilled opening under plane strain conditions.…”

Section: Numerical Modelmentioning

confidence: 99%

“…The dependency mechanism of the backfill state near the opening center was further analyzed by Yang [31], considering linear elasticity and yielding of the backfill based on the commonly used Mohr-Coulomb elasto-plastic model. Jahanbakhshzadeh et al [32] investigated the non-uniform distribution of K in inclined backfilled stopes using the related backfill parameters, ν and ϕ .…”

Section: Introductionmentioning

confidence: 99%

“…As the stresses are not uniform across the stope width [33,34], due to shear stresses developing between the fill and walls, applying a constant K to the entire opening is not representative [20,32]. In addition, the value of the principal stress ratio, K ps (= σ 3 /σ 1 ; defined as the ratio of the minor to major principal stresses) can differ from that of K near opening walls where the horizontal and vertical stresses may be different from the minor and major principal stresses.…”

Section: Introductionmentioning

confidence: 99%

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Stress Ratios in Entire Mine Stopes with Cohesionless Backfill: A Numerical Study

Yang

Aubertin

2017

Minerals

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Evaluation of stress states in backfilled mine stopes (or similar openings), using arching theory, can be largely impacted by the value selected for the earth pressure coefficient, K = σ h /σ v . Recently, the current study's authors addressed the debate about the value of K near the opening center, based on Rankine's active coefficient (K a ) and at-rest coefficient (K 0 ). Here, stress ratios in vertical backfilled stopes are numerically assessed (in two dimension, 2D), considering both the independent and related backfill internal friction angle (ϕ ) and Poisson's ratio (ν). Emphasis is placed on the backfill state near stope walls, where local rotation of stresses occurs, so the coefficient (K) and principal stress ratio, K ps (= σ 3 /σ 1 ), should be distinguished. Parametric analyses indicate that values of K and K ps depend on the position and the relationship between ϕ and ν. Near the opening center, K (= K ps ) is close to K a when ν or ϕ is below a critical value; otherwise the value approaches K 0 , defined from ν. Near both walls, K ps is always close to K a , while K is near K 0 for related ν − ϕ cases and depends on their respective values for independent ν and ϕ . Additional simulations conducted with interface elements indicate that the stress ratios near the opening center line are insensitive to interface roughness and are almost identical to values obtained without interfaces, but the stress ratios near walls may change for less rough or smooth interfaces.

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Section: Numerical Results Obtained With Interface Elementssupporting

confidence: 90%

Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stress Ratios in Entire Mine Stopes with Cohesionless Backfill: A Numerical Study

Yang

Aubertin

2017

Minerals

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“…Based on the mention above, out in-depth and detailed numerical studies on the distribution and variation in abutment stress around a stope by incorporating field monitoring, numerical simulation, and theoretical analysis have been carried. [15][16][17][18][19] For instance, based on the analysis of anchor cable stress monitoring, support resistance monitoring, borehole stress gauge measurement, and microseismic monitoring results, the evolution law of front abutment stress in a working face was studied and summarized. [20][21][22][23] By establishing a two-dimensional nonlinear numerical model with nonuniform characteristics, a distribution law of front abutment stress was simulated and analyzed.…”

Section: Introductionmentioning

confidence: 99%

A new theoretical method for calculating front abutment stress during coal mining

Liu

Wang

Liu

et al. 2019

Energy Science & Engineering

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The calculation of abutment stress has always been the most important topic in safe underground mining and design. In this paper, based on the formation mechanism of abutment stress, combined with the mechanical properties of actual strata and the theory of elastic foundation beams, a structure model of overlying strata with an elastic foundation is established, and a new theoretical calculation method of abutment stress is proposed. The new calculation method takes into account the interaction of the overlying key strata and the effect on the transmission of the front abutment stress and then analyzes the stress patterns of multilayered key strata under the combined action of the bending moment, shear force, and nonuniform load and its transmission to the underlying strata. In addition, based on field observations of panel 10 305 in the Xinglongzhuang coalmine, the influence range, peak position, and variation trend of the front abutment stress before and after breaking of the overlying key strata are studied and verified. The results show that the influence range of the abutment stress remains unchanged after KS1 breaks (eg, from 0 to 180 m), and its peak position shifts forward from 8 to 19 m, while the influence range (0‐180 m) and its peak position (6‐8 m in front of coal wall) remain unchanged after KS2 breaks; the abutment stress decreases, and the maximum decrease is 3.9 MPa in the range of 0‐22 m ahead of the coal wall after KS1 breaks, while the maximum decrease in the abutment stress is 2.1 MPa in the range of 0‐71 m ahead of the coal wall after KS2 breaks. The results of the new calculation method are basically consistent with the field observations and the existing theoretical results, showing that the method has good adaptability and reliability and can provide a new theoretical basis for on‐site design and construction practices.

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Effects of compressive deformation of backfill materials on strata movement and stress evolution in deep gangue backfill mining

Peng

Zhang

et al. 2022

Bull Eng Geol Environ

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A New Analytical Solution for the Stress State in Inclined Backfilled Mine Stopes

Cited by 27 publications

References 24 publications

Stress Ratios in Entire Mine Stopes with Cohesionless Backfill: A Numerical Study

Stress Ratios in Entire Mine Stopes with Cohesionless Backfill: A Numerical Study

A new theoretical method for calculating front abutment stress during coal mining

Effects of compressive deformation of backfill materials on strata movement and stress evolution in deep gangue backfill mining

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