The Effects of Backfill Mining on Strata Movement Rule and Water Inrush: A Case Study

Jiang, Hao; Shi, Yongkui; Lin, Jiahui; Wang, Xin; Xia, Hongchun

doi:10.3390/pr7020066

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…The ideas of pre-splitting at a high position and shattering at a low position mainly include the following two aspects: One is pre-splitting at a high rock strata to promote the roof caving in time, which can decrease the risk of rock burst due to the accumulation of a large amount of elastic potential energy [38][39][40][41][42][43]. The other is blasting at a low position to increase the crushing degree of rock [44][45][46], which helps fill goaf effectively and reduce the height of the caving zone.…”

Section: The Approach To Prevention and Control Of Multi-dynamic Disastersmentioning

confidence: 99%

An Approach to Dynamic Disaster Prevention in Strong Rock Burst Coal Seam under Multi-Aquifers: A Case Study of Tingnan Coal Mine

et al. 2021

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In order to prevent the multi-dynamic disasters induced by rock burst and roof water inrush in strong rock burst coal seams under multi-aquifers, such as is the case with the 207 working face in the Tingnan coal mine considered in this study, the exhibited characteristics of two types of dynamic disasters, namely rock burst and water inrush, were analyzed. Based on the lithology and predicted caving height of the roof, the contradiction between rock burst and water inrush was analyzed. In light of these analyses, an integrated method, roof pre-splitting at a high position and shattering at a low position, was proposed. According to the results of numerical modelling, pre-crack blasting at higher rock layers enables a cantilever roof cave in time, thereby reducing the risk of rock burst, and pre-crack blasting at underlying rock layers helps increase the crushing degree of the rock, which is beneficial for decreasing the caving height of rock layers above goaf, thereby preventing the occurrence of water inrush. Finally, the proposed method was applied in an engineering case, and the effectiveness of this method for prevention and control of multi-dynamics disasters was evaluated by field observations of the caving height of rock layers and micro-seismic monitoring. As a result, the proposed method works well integrally to prevent and control rock burst and water inrush.

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Section: The Approach To Prevention and Control Of Multi-dynamic Disastersmentioning

confidence: 99%

An Approach to Dynamic Disaster Prevention in Strong Rock Burst Coal Seam under Multi-Aquifers: A Case Study of Tingnan Coal Mine

et al. 2021

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“…However, due to the high frequency of deep mining disasters, it is faced with severe challenges, and some scholars have also done much basic research [3][4][5][6]. Gangue solid filling is one of the main technologies used to solve the deep mining problems: it plays a significant role in the control of rock strata and effective utilization of the gangue, effectively controls the surface deformation and stratum fracture, reduces the ground damage, consumes the gangue on the ground and underground, and abates the gangue occupation and pollution [7][8][9][10][11]. In particular, the gob-side entry retaining (GER) has been widely used in China due to its great contribution to improving the stress environment of the entry and increasing the coal resource recovery rate [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Deformation Law and Control Measures of Gob‐Side Entry Filled with Gangue in Deep Gobs: A Case Study

Liu

Hao

et al. 2021

Advances in Materials Science and Engineering

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Aiming at the large deformation problem of gob-side entry in solid filling mining, the roof subsidence of gob-side entry retaining (GER) was studied under the influence of gangue filling, by taking a deep filling working face in Shandong Province as the engineering background and using theoretical derivation as well as FLAC3D numerical simulation. Research shows that the stiffness of the gangue filling body in the gob and the stiffness and width of the entry protection coal and rock mass (EPCARM) are positively correlated with the GER roof subsidence, which is much less affected by the EPCARM parameters than by the GER stiffness. The GER failure to meet the application requirements is mainly attributed to the insufficient stiffness of the gangue filling body and excessive advance subsidence, which inhibit the roof stress transfer. The GER replacement by the gob-side entry driving (GED) scheme, which implies replacing the entry protection gangue bag wall with the coal pillar with a width of 5 m, will reduce the roof subsidence to 0.114 m, according to the proposed equation. The results obtained are considered quite instrumental in deformation control of the gob-side entry filled with gangue, as well as substantiation of GED and GER applicability options.

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“…In view of the early warning and prevention of floor water inrush from mining above confined aquifer, accurate calculation of floor failure depth is the key, and accurate description of the stress distribution caused by mining is a prerequisite [29,30]. Based on the stress distribution of 41503 working face in Shandong Huatai Coal Mine, China, this study established a mechanical model in the semiinfinite body with the distributed load on the upper boundary (induced by mining) and the uniformly distributed load on the lower boundary (induced by confined aquifer) to calculate the stress in any point in the floor.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Analysis of the Failure Characteristics of Stope Floor Induced by Mining and Confined Aquifer

Lü

Wen-jun

Yin

et al. 2021

Shock and Vibration

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Mining above confined aquifer has become an important task for water inrush prevention in China. To study the failure characteristics of stope floor along the strike, a mechanical model under combined action of mining and confined aquifer was constructed, and the distribution of vertical stress, horizontal stress, and shear stress was obtained. Based on the Mohr–Coulomb criterion, the failure range of the floor is determined and verified by the in situ test. The results indicate the following. (1) Both vertical stress and horizontal stress in the stope floor take the junction of stress increasing area and stress decreasing area as the dividing line, forming two groups of “convex arches” at the solid coal side and the goaf side, respectively. (2) The vertical stress gradient in the solid coal side is significantly higher than that in the goaf side, while the horizontal stress gradient in the solid coal side is similar to that in the goaf side. The shear stress distribution is divided into three regions by the boundary between positive and negative shear stress, which makes the stope floor in this area to show compression shear or tension shear failure. (3) According to the in situ test, the maximum floor failure depth of 41503 working face is 11.38 m, which is quite close to the theoretical calculation result of 9.68 m. (4) Applying the mechanical model to five other coal mines with different mining conditions and stress states, the maximum absolute error between the measured and theoretical values of floor failure depth is 1.1 m, the average absolute error is 0.8 m, the maximum relative error is 8.2%, and the average relative error is 6.5%. The study provides a certain mechanical basis and reference for the floor failure mechanism induced by mining and confined aquifer.

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The Effects of Backfill Mining on Strata Movement Rule and Water Inrush: A Case Study

Cited by 13 publications

References 10 publications

An Approach to Dynamic Disaster Prevention in Strong Rock Burst Coal Seam under Multi-Aquifers: A Case Study of Tingnan Coal Mine

An Approach to Dynamic Disaster Prevention in Strong Rock Burst Coal Seam under Multi-Aquifers: A Case Study of Tingnan Coal Mine

Deformation Law and Control Measures of Gob‐Side Entry Filled with Gangue in Deep Gobs: A Case Study

Mechanical Analysis of the Failure Characteristics of Stope Floor Induced by Mining and Confined Aquifer

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