Ultimately exposed roof area prediction of bauxite deposit goaf based on macro joint damage

Jiang, Lichun; Yang, Chao; Jiao, Huazhe

doi:10.1016/j.ijmst.2020.06.005

Cited by 23 publications

(6 citation statements)

References 14 publications

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“…Mining is one of the essential conditions to ensure the rapid development of China’s economy, but mining also brings problems such as goaf collapse and mining waste pollution [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The filling mining method can effectively control stope ground pressure and stope deformation while making full use of mine solid waste tailings, which not only ensures the safety of mining but also solves the problem of environmental pollution to a certain extent [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ], so it is extensive use of various metal and non-metal mines.…”

Section: Introductionmentioning

confidence: 99%

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Chen

Zhang

et al. 2022

Materials

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Layering of filling body is common in large-scale filling areas. In this paper, the cement–sand ratio of 1:8 is based on the configuration of 68%, 70%, 72% and 74%; four concentrations; and filling layers of one-, two-, three- and four-layered cemented filling samples. Combined with a uniaxial compression test and two-dimensional particle flow software (PFC2D), the mechanical properties and failure modes were explored. The results show that the concentration can strengthen the uniaxial compressive strength of the filling body while increasing the filling times weakens its power; therefore, the constitutive damage model was constructed. It was found that the initial layered damage existed in the layered filling, and the total damage showed an upward trend of first fast and then slow; the main failure modes of one-layer and two-layer backfills showed prominent shear failure characteristics, and the three-layer and four-layer fillings were closer to tensile failure. From the crack generation to the specimen failure, there is a mutual conversion between different energies.

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Section: Introductionmentioning

confidence: 99%

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Chen

Zhang

et al. 2022

Materials

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“…Meanwhile, continuous high-strength mining of bauxite will also produce large-scale goafs, easily causing roof fall and side collapse accidents. As a result, these accidents may lead to caving zones, fissure zones, and bending subsidence zones occurring in the above clay layer [37], as shown in Figure 11b. Extensive crack propagation may cut through the overlying coal seam and cause gas outburst disaster, endangering mining safety.…”

Section: Coupling Mechanism Analysis Of Paste Backfill and Layered Soft Rocksmentioning

confidence: 99%

Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams

Zhang

Feng

et al. 2021

Minerals

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The mining of layered soft bauxite under coal seams (BCS) will cause serious underground goaf disasters and surface Bayer process red mud (BRM) pollution. In order to realize the safe and efficient mining of BCS, the feasibility of recycling BRM as a backfilling aggregate was explored. A series of tests were conducted to prevent the pollution diversion of BRM from surface storage to underground goafs, and a numerical simulation analysis of the backfilling mining process was carried out based on FLAC3D to protect the overlying coal seam. The results show that: under the action of encapsulation, solidification and inhibiting precipitation from cementitious materials, the leaching concentration of harmful substances in red mud-based cemented backfill (RCB) can be reduced 70% more than fresh BRM. Mining disturbance redistributes the in-situ stress field of overlying strata; normal backfilling can not only reduce the pressure stress of pillars, but also release the tensile stress in the roof and floor from +0.4956 MPa to −0.1992 MPa, effectively preventing roof subsidence. Since the creep damage process of past backfill will absorb and dissipate lots of energy, the disturbance range caused by backfill mining is controlled within 3 m, which is only 10% of the open-stope method.

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“…Based on a summary of numerous mining engineering practices, Matthews proposed a diagrammatic method for assessing the relationship between the stability index N of a rock mass and the shape coefficient of the exposed mining area [16]. Jang et al proposed a stability stress mechanics model for goaf and discussed the relationship between the ultimate exposed area of goaf and the span ratio, joint density of the fracture surface, and joint diameter [17]. Swift et al used an elastic beam model and a pillar strength formula to study the relationship between the exposed area of goaf, the pillar stability, and a safety factor [18].…”

Section: Introductionmentioning

confidence: 99%

Study of the Critical Safe Height of Goaf in Underground Metal Mines

Zhang,

Chen

et al. 2024

Minerals

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The empty-space subsequent filling mining method is the main mining scheme for underground metal mines to achieve large-scale mechanized mining. The stage height, one of the main parameters of this method, affects the various production process aspects of the mine and influences the stability of the goaf. In order to determine the stage height scientifically and rationally in the empty-space subsequent filling mining method, a formula for the stabilized critical safe height of a high goaf in an underground metal mine was derived based on Pu’s arch equilibrium theory, Bieniawski’s pillar strength limit theory, and the Kastner equation and combined with the results of an orthogonal analysis to rank the importance of the main factors in the formula. A copper mine in Jiangxi Province was used as a case study, with the reliability of the formula verified by numerical simulation and industrial testing. The factors in the formula influencing the critical stabilized safe height of the goaf were, in descending order, the compressive strength of the rock body, the width of the two-step mining pillar, the width of the one-step mining room, the mining height, and the depth of mining. Based on the calculation results, the recommended stage heights are 30 m (−378 m middle section) and 25 m (−478 m middle section) in the area of poor rock body stability and 50 m in the area of better rock body stability. The simulation results show that the goaf is significantly affected by the compressive stress under the condition of a certain rock body stability and that the compressive stress increases with increasing goaf height. The minimum recommended values of the sidewall safety coefficients in areas of poor and better rock stability are 1.04 and 1.06, respectively. The volume deviation coefficients of the three industrial test mines were all controlled within 3%, indicating that no obvious collapse and destabilization phenomenon occurred in the goaf. This paper provides some theoretical and applied guidance for the stage height design of similar underground metal mines using the empty-space subsequent filling mining method.

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Ultimately exposed roof area prediction of bauxite deposit goaf based on macro joint damage

Cited by 23 publications

References 14 publications

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams

Study of the Critical Safe Height of Goaf in Underground Metal Mines

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