Sensitivity Analysis and Numerical Simulation Study on Main Controlling Factors of Surface Movement and Deformation in Strip Filling Mining under Thick Unconsolidated Layers

Sun, Dequan; Wu, Qiuyun; Li, Xiaoyan; Zhang, Zhaomin; Xu, Xiaoqing; Li, Yang; Wu, Quansen

doi:10.1155/2021/6615937

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Thick loose strata mostly consist of sparsely distributed sediments that have not undergone the process of solidification and hardening into rock, exhibiting comparable physical characteristics [9]. The underlying rock strata, situated beneath the extensive loose strata, are composed of sequentially deposited mudstone, fine sandstone, siltstone, and other stones exhibiting distinct physical features [10].…”

Section: Introductionmentioning

confidence: 99%

Research on the dynamic development of Bed-Separations and ground subsidence based on large-deflection inclined thin-plate model

Li,

Yang,

WEI

et al. 2024

Preprint

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Coal mining under the Quaternary thick loose layer makes unique patterns of rock destruction. These patterns directly affect direct and main roof breakage, key strata flexural breakage, Bed-Separations development, ground subsidence, and other studies. In this paper, we developed an approach to solving the deflection of thin plates with additional lateral load and mid-plane force. The dynamic mechanical model of key strata deflection caused by dip coal seams with a thick loose layer is also established. The methods presented are based on the principle of large-deflection of thin-plate, energy method, and fracture mechanics theory. The 7225 work face in Anhui Province, China, was studied. The key strata deflection parameters in the study area were obtained, including 1) the initial and periodic incoming pressure steps of the roof, 2) the height of the caved zone, fractured zone, and continuous bending zone, and 3) the development of height and volume of Bed-Separations. The ground subsidence pattern was revealed as well. The dynamic development of the principal key strata (PKS) calculated by the proposed model is verified with the 3DEC numerical simulation. Meanwhile, 16 Sentinel 1-A images covering the mining period were collected, and the Small Baseline Subset (SBAS) technique was applied to monitor the mining subsidence. It is also cross-validated with the model-calculated subsidence and field measurements. The results showed that the proposed model could contribute to the quantitative analysis of key strata deflection breakage, Bed-Separations development, and ground subsidence caused by excavating inclined coal seams when a thick loose layer covers.

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Section: Introductionmentioning

confidence: 99%

Research on the dynamic development of Bed-Separations and ground subsidence based on large-deflection inclined thin-plate model

Li,

Yang,

WEI

et al. 2024

Preprint

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“…The results revealed that the width of the filling body had a great influence on the stability of the gob-side roadway. Sun et al [27] studied the deformation characteristics of fully mechanized caving roadways through similar simulation tests, concluding that the filling body should be of both a certain strength and a certain deformation resistance capacity. Seryakov [28] analyzed the deformation and stress distribution characteristics of roadway surrounding rock and proposed a design principle for deep roadway filling support by analyzing on-site mine pressure monitoring data.…”

Section: Introductionmentioning

confidence: 99%

Study on the Bearing Mechanism and Stability of Surrounding Rock in Original Roadway Filling and Nonpillar Tunneling

Shi

Chang

et al. 2023

Geofluids

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This study is focused on the problem that with the increase of coal seam mining depth, it is difficult to continuously replace mining due to complex roadway layout and unreasonable stope layout. By taking the mining geological conditions of the 62210 fully mechanized mining face of Xinzhuangzi Coal Mine in Huainan mining area, China, as the background, it explores the stress characteristics of the original roadway filling body as well as the stress distribution and deformation characteristics of roadway surrounding rock in original roadway filling and nonpillar tunneling (ORFNPT) through theoretical analysis and numerical simulation. The following findings are obtained. The required strength for the filling body is primarily determined by two factors, i.e., the span of the hanging roof that lies over the filling body and the width of the filling body. The span of the hanging roof is positively correlated with the required strength of the filling body. However, when the width of the filling body reaches a certain value, its further increase fails to change the required strength of the filling body. Compared with gob-side entry driving with small coal pillars, when the ORFNPT technology is applied to the lower-section roadway, the peak stress position in the solid coal on the lower side of the roadway is closer to the roadway sides, and the filling body is of a much higher stress than the small coal pillars. Besides, the roadway surrounding rock undergoes milder deformation. According to the on-site application and measurement data, the roof-to-floor convergence and side-to-side displacement amounts of the roadway are about 89 mm and 58 mm during tunneling of the 62310 working face, and the two amounts are about 910 and 1,290 mm during recovery of the 62310 working face, respectively. This tunneling method achieves an excellent roadway control effect.

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Mechanical prediction method of strata movement and surface subsidence in backfill-strip mining

Zhu,

Zha,

Guo

et al. 2024

Sci Rep

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Underground coal excavation has caused a series of geological disasters and environmental problems, especially coal mining subsidence. Backfill-strip mining, which combines the advantages of strip mining and backfill mining, can reduce subsidence and improve the recovery rate of coal. Therefore, predicting the impact of backfill-strip mining on the surface environment and strata structure is essential for the better development of backfill-strip mining technology. Here, a scientific and comprehensive mechanical model is creatively proposed. The mechanical model is divided into two systems at the main key strata (MKS): the lower strata of the MKS are regarded as a rectangular plane mechanical model on the Winkler foundation, comprising spaced filling bodies and coal pillars, and the upper strata of the MKS are regarded as a space-layer mechanical model. First, the subsidence function of the MKS is proposed. Then, this function is transmitted to the space-layer mechanical model through the interface. Finally, the mechanical model is used to predict the subsidence of the strata and the surface. The feasibility of the model is verified by numerical simulation and similar material simulation, and the characteristics of strata movement are analyzed. Using the mechanical model, the influences of geological and mining conditions on strata movement are discussed. This provides theoretical guidance for the study of strata movement and mechanisms in backfill-strip mining.

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Sensitivity Analysis and Numerical Simulation Study on Main Controlling Factors of Surface Movement and Deformation in Strip Filling Mining under Thick Unconsolidated Layers

Cited by 6 publications

References 16 publications

Research on the dynamic development of Bed-Separations and ground subsidence based on large-deflection inclined thin-plate model

Research on the dynamic development of Bed-Separations and ground subsidence based on large-deflection inclined thin-plate model

Study on the Bearing Mechanism and Stability of Surrounding Rock in Original Roadway Filling and Nonpillar Tunneling

Mechanical prediction method of strata movement and surface subsidence in backfill-strip mining

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