Investigation and characterization of mining subsidence in Kaiyang Phosphorus Mine

Deng, Jian; Bian, Li

doi:10.1007/s11771-007-0081-5

Cited by 14 publications

(7 citation statements)

References 4 publications

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“…Extensive crack propagation may cut through the overlying coal seam and cause gas outburst disaster, endangering mining safety. In addition, large-scale goafs may also lead to surface subsidence and collapse, causing serious damage to surface rivers, highways, and structures [38].…”

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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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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“…Only a few open-pit phosphorite mines have transferred into underground mining. On the other hand, phosphorite is mainly sedimentary, occurrences of which are far distinct from those of metal ores (Deng and Bian 2007;Steiner et al, 2015). To this day, few publications are involved with the stoping of phosphorite seams with slight inclination and thin-tomedium thickness.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Stratum and Surface Deformation in Underground Phosphorite Mining Under Different Mining Methods

Wang²,

et al. 2022

Front. Earth Sci.

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With the ending of deep-concave open-pit phosphorite extractions and gradual exhausting of shallow mineral resources, stoping of phosphorite seams has entered or will enter into underground mining. Particularly for excavating slightly inclined thin and medium-thick phosphorite orebodies, roof and surface control under different mining methods is crucial for safe and efficient exploitations. In this study, the study area is located in Kunyang Phosphorite Mine characterized by slightly inclined thin and medium-thick deposits. Based on the occurrence conditions, orebody thickness, dip angle, and more factors, the mining methods of underground phosphorite are selected, including room and pillar mining, cement backfill mining, and caving mining. Numerical analysis on roof deformation and surface subsidence under the three methods is performed. The results show that the amount of roof and surface subsidence decreases successively by the caving method, room and pillar method, and cement backfill method. The maximum roof and surface subsidence by the caving method is 45.7 and 13.3 cm, respectively. Regarding shallow orebodies, the open-pit slope is obviously disturbed by the caving method and room and pillar mining method. Hence, slope displacement monitoring should be emphasized. Compared with the other two methods, the backfill mining method can use mined wastes as backfill materials and has less influence on the roof and surface during stoping and is better at controlling slope stability.

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“…Some of these are under high and steep rock slopes (HSRS), where mining activities may decrease the slope stability, causing landslides and threatening the safety of people and properties nearby. Due to the advantage of removing the underground goaf hazards and preventing surface subsidence, the backfill mining method is widely used in complicated mining conditions, for example, mining under bodies of water, railways or highways, and buildings [3][4][5] (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Confidence Level Evaluation of Backfill Mining under High and Steep Rock Slopes

Wang

et al. 2018

Advances in Civil Engineering

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To extract the 6.3 million tons of high-quality phosphate resources, a stability analysis and confidence level evaluation of backfill mining under high and steep rock slopes (HSRS) were conducted using the Slide software and a Monte Carlo simulation. The geological model of HSRS was constructed based on a geotechnical investigation. A series of laboratory tests were conducted to obtain the engineering parameters of the rock mass, and the mechanism of action of the backfill mining method was analyzed. After the stability analysis, the average safety factors of HSRS for normal operation are 1.575 (backfill method) and 1.509 (open-stope method), and for seismic conditions, they are 1.470 (backfill method) and 1.380 (open-stope method). According to the confidence level evaluation, the average failure probability of HSRS by using the backfill mining method is 0.0143. The results showed that using the backfill mining method under HSRS had better seismic stability and lower potential levels of destruction than using the traditional open-stope mining method. In addition, the backfill mining method can prevent the development of a circular failure surface, reduce the destructive effect of mining to a minimum, and maintain the lower failure probability of HSRS.

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Investigation and characterization of mining subsidence in Kaiyang Phosphorus Mine

Cited by 14 publications

References 4 publications

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

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

Numerical Investigation on Stratum and Surface Deformation in Underground Phosphorite Mining Under Different Mining Methods

Stability Analysis and Confidence Level Evaluation of Backfill Mining under High and Steep Rock Slopes

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