Prediction of the caved rock zones’ scope induced by caving mining method

Ren, Fangfang; Liu, Yang; Cao, Jianli; He, Rongxing; Fu, Yu; Zhou, Yanjun; Liu, Huan

doi:10.1371/journal.pone.0202221

Cited by 13 publications

(7 citation statements)

References 26 publications

(22 reference statements)

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“…In this study, a new standpoint was proposed that the distribution laws could be divided into three parts, and then the lateral pressure increased exponentially with increasing depth of granular media. Ren et al [35] and He et al [36] reported the distribution laws of lateral pressure from different orebody dip conditions, which seemed consistent with the scope of drawing influencing region, but to a certain extent had its variation on the upper descending zone and the central growth area. ese abovementioned results are under the invariable width of orebody, and the vibration of blasting is not considered; further studies are essential to improve this simple description to the more comprehensive results of complex gravity flow encountered in actual mines.…”

Section: Discussionmentioning

confidence: 59%

Experimental Investigation of the Influence for Stoping Sequence and Granular Grading on Lateral Pressure during the Nonpillar Sublevel Caving Mining

Liu

Ren

et al. 2020

Advances in Civil Engineering

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In this study, a self-designed scaled physical model was conducted to investigate the variation laws of lateral pressure under different stoping sequences and granular gradings, and drawing ore in the experiments was used to simulate the mining process. Under the limiting equilibrium state, the values of lateral pressure increased exponentially with the increasing depth of granular media, and the growth rate of lateral pressure gradually decreased as the depth of granular media increased. Then, the laboratory results indicated that the distribution laws of lateral pressure were divided into three parts, namely, the drawing influencing region, the upper descending zone, and the central growth area. As the height of the isolated extraction zone (IEZ) increased, the scope of the drawing influencing region and the upper descending zone increased, while the range of central growth area decreased. In the case of an invariable height of IEZ, more reduction ratio and the scope for drawing influencing region could be appeared in the lower wall. Increasing the space between the drawpoints and granular grading were an effective way to control the reduction rate of lateral pressure in the drawing influencing region, while the scope of the above parts kept stable. Moreover, the average values of lateral pressure showed an increasing trend as the granular grading decreased at the same number of drawing ore.

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Section: Discussionmentioning

confidence: 59%

Experimental Investigation of the Influence for Stoping Sequence and Granular Grading on Lateral Pressure during the Nonpillar Sublevel Caving Mining

Liu

Ren

et al. 2020

Advances in Civil Engineering

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“…Hence, numerous literatures have demonstrated such contribution; Laubscher [13] proposed an empirical solution to describe the effect of the density and height of caved rocks. To describe the stress from caved rocks to the surrounding rocks in a confined space, Ren et al [25] conduct the scaled laboratory tests, and the results reveal this stress matches the solution for granular materials by Janssen [26]:…”

Section: Impact Of Caved Rocks On Stability Of Cylindrical Cavedmentioning

confidence: 83%

Cylindrical Caved Space Stability Analysis for Extension Prediction of Mining-Induced Surface Subsidence

Liu

Zhang

et al. 2021

Geofluids

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Subsequent extension of surface subsidence after vertical caving leads to large-scale surface destruction, as well as associated geological hazards. The extension prediction for cylindrical caved space, which appears circular surface subsidence, is still an intractable issue, due to the absence of robust models. To fill such a research gap, this paper provides an analytical model for the depth and orientation where the shear failure of isotropic rocks around the caved space is firstly observed. The anisotropy of surrounding rocks is further involved to enable this model to analyze the slip failure along discontinuities in anisotropic stress state. The prediction for the extension of the surface subsidence in Xiaowanggou iron mine is conducted, and the comparison between the prediction and the observation in satellite images demonstrates the validity of the proposed model. Even though this model cannot provide a definite boundary after extension, the prediction for the orientation surface subsidence extends to contribute to mitigating the effect of geological hazards. Another contribution of this work is to provide guidance to mitigate the impact of surface subsidence on safety and environment, such as filling the interspace between large-sized caved rocks by dumping small-sized waste rocks or backfilling the caved space with waste rocks.

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“…The analysis process follows the principle that the loose range is the released range [ 30 , 31 ]. Suppose the loosening height of coal body at any time is h t , the vertical distance from coal discharge port to roof is h 0 , the part below h 0 is defined as lower coal body, and the part above h 0 is defined as upper coal body.…”

Section: Schemes and Resultsmentioning

confidence: 99%

Law of coal caving behind the flexible shield support in pseudo-inclined working face

et al. 2021

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Complex boundary conditions are the major influencing factors of coal caving law in the pseudo-inclined working face. The main purpose of this study is to analyze coal caving law of flexible shield support and then to establish the internal relations among coal caving parameters under complex boundary conditions. Firstly, the law of coal caving in different falling modes is simulated physically. Secondly, the coal caving shape, displacement field, and contact force field is simulated. Then, coal caving law and process parameters is analyzed theoretically. Finally, the test was performed in Bai-Ji Mine. The research shows that ellipsoidal ore drawing theory has universal applicability in coal drawing law analysis and parameter optimization. After the Isolated Extraction Zone and Isolated Movement Zone reach the roof, the expansion speed is marked by a short delay, and then, while expanding to the floor, two butted incomplete ellipsoids are formed. There is a time-space difference in coal caving after the support, and some coal will be mined in the next round of coal caving. There are obvious differences in the coal loosening range, displacement field, and contact force field on both sides of the long axis. When the support falls along with the bottom plate, it is more conducive to the release of coal. The test shows that the research is of great significance for optimizing the caving parameters of flexible shield support in the pseudo-inclined working face of the steep seam.

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Prediction of the caved rock zones’ scope induced by caving mining method

Cited by 13 publications

References 26 publications

Experimental Investigation of the Influence for Stoping Sequence and Granular Grading on Lateral Pressure during the Nonpillar Sublevel Caving Mining

Experimental Investigation of the Influence for Stoping Sequence and Granular Grading on Lateral Pressure during the Nonpillar Sublevel Caving Mining

Cylindrical Caved Space Stability Analysis for Extension Prediction of Mining-Induced Surface Subsidence

Law of coal caving behind the flexible shield support in pseudo-inclined working face

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