Effects of solid backfilling on overburden strata movement in shallow depth longwall coal mines in West China

Huang, Peng; Spearing, A.J.S.; Feng, Jie; Jessu, Kashi Vishwanath; Guo, Shuai

doi:10.1088/1742-2140/aac62c

Cited by 40 publications

(14 citation statements)

References 10 publications

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“…The three groups of waste-rock samples, which were made according to the gradation scheme in Table 2, were tested. The axial displacement and stress of waste-rock samples were recorded using an axial extensometer As per the experimental requirements for compressing coarse-grained soil materials [16,29,36], the maximum particle size of the material was less than one-fifth of the inner diameter of the compression cylinder. In this study, the inner diameter of the compression cylinder was 100 mm, indicating a waste-rock maximum particle size of 20 mm.…”

Section: Experimental Schemementioning

confidence: 99%

“…This method not only protects surface buildings, but also reduces environmental pollution caused by the large quantities of waste-rock material produced during roadway excavations and coal washing [8][9][10][11][12]. However, the deformation characteristics of waste-rock materials greatly affect the roof stability by overlying the strata movement of gob areas, and consequently dominate surface subsidence [13][14][15][16][17]. The bearing capacity of backfilled waste-rock in gob areas is influenced by its deformation modulus.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining

Zhang

Zhao

et al. 2019

Minerals

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Waste-rock material used in underground backfill mining has a granular texture and acquires non-linear deformation characteristics when compressed. The deformation modulus of waste-rock measured by a laboratory compression test is significantly different from the true deformation modulus in the field, due to the complete confining effect of the loading steel cylinder. In this study, we performed a series of laboratory-based compression tests on waste-rock samples. The results showed that lab-acquired deformation modulus variations of waste rock could be divided into three stages: slow increase, accelerated increase, and rapid increase. We also measured the true deformation modulus of backfill waste rock by conducting a field test in gob areas of the Tangshan coal mine, China. The hardening process of backfill waste rock during the field test was analyzed, and could be divided into four stages: roof contact, rapid compression, slow compression, and long-term stable. With the increase of axial strain, the lab- and field-measured deformation moduli of waste rock both increased exponentially. A correction parameter was proposed to investigate the relationship between the field-generated true deformation modulus and the lab-tested deformation modulus. The correction parameter k positively correlated with the axial strain, in the form of an exponential function. The magnitude of k was between 0.5616 and 0.6531.

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Section: Experimental Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining

Zhang

Zhao

et al. 2019

Minerals

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“…A ribbon conveyer used for solid backfilling material transportation is set in the railway laneway of the working face. Thus, the mining and backfilling can be operated at the same time [20][21][22][23]. At present, this technology has achieved rapid development in its process, equipment and basic theories.…”

Section: Introductionmentioning

confidence: 99%

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

Zhang¹,

Zhang²,

Wu³

et al. 2019

Sustainability

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China is the world’s largest coal producer country. However, large-scale coal mining has led to severe environmental pollution issues such as surface subsidence and gangue piling up. The gangue discharging amount has ranked the first in the world and coal mine enterprises are facing enormous discharging reduction pressure. This paper summarizes the research progress of the solid backfilling mining technology and then illustrates the realistic demands and significance of implementing underground coal-waste separation. It also focuses on the technical principles, systems and key equipment of the common underground coal-waste separation methods, such as the selective crushing method, the dense medium shallow groove method, the vibro-assisted jigging method and full-size water separation method and ray identification method. In addition, the selection steps of underground coal-waste separation method, the design process of large section separation chamber and the design principle of separation and backfilling system are proposed, finally, the mining-separating-backfilling + X for coal mining is put forward. By combining the technology of mining-separating-backfilling with other technologies, such as gob-side entry retaining with non-pillar mining, gas extraction, solid waste treatment, water protection mining, mining under buildings, railways and water bodies, the integrated mining methods, mining-separating-backfilling + setting pillars, gas drainage, treatment, protection and prevention methods are formed. It also introduced the ‘mining-separating-backfilling + gas extraction’ technology’s whole idea, system arrangement, separation equipment and practical engineering application effects based on the specific engineering case of pingmei no. 12 coal mine. The results indicate that the integration of underground coal-waste separation and solid backfilling technology could achieve gangue discharging reduction, underground washing and surface subsidence control. It is effective at realizing green mining.

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“…Paste materials, such as cement material and high-water material, can be reinforced by grouting with formwork to create a roadside supporting wall, and a spatial mechanical model can be established to determine the main parameters of the paste roadside supporting body [15,16]. In order to solve the problems of waste hill pollution and high filling costs in mining areas (as shown in Figure 1), gangue material is gradually applied in filling mining [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Novel Segmented Roadside Plugging-Filling Mining Method and Overlying Rock Mechanical Mechanism Analyses

Zhang

et al. 2019

Energies

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The no-pillar mining method is widely used in coal mining engineering because of its superiority in resolving mine pressure hazards and protecting natural resources. In view of the geological conditions of stable strata in a coal mine of the Shandong Coal Zone, a novel segmented roadside plugging-filling mining method is proposed by introducing the filling coefficient into roadside filling. The operation process is designed with a new grouting filling forming device. Based on the relationship between the theoretical deflection of a cantilever beam and geometric settlement and parallel settlement models, strength formulas applicable to the segmented roadside plugging-filling (SRPF) method at different migration stages are obtained, and the deformation formulas of a roadway toward a rock slab are solved by an elastic equivalent model. Further, the determination procedure of the filling mode under the mining method is clarified. The SRPF method was implemented on a test stope, and the test results indicated that the theoretical deformation produced by the SRPF method was small and can meet the mining requirements. Through on-site test monitoring, the deformation of surrounding rock was 0–160 mm and the filling body under the SRPF method could maintain its own strength and the stability of the surrounding rock. In addition, entire successful mining been completed in the working stope, which further proves the applicability of this method. The backfilling cost of the gob-side filling was reduced by approximately 50%, and the backfilling efficiency was improved in the mine. The description of the novel mining method may provide theoretical and practical guidance for coal mining in similar geological conditions.

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Effects of solid backfilling on overburden strata movement in shallow depth longwall coal mines in West China

Cited by 40 publications

References 10 publications

Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining

Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

Novel Segmented Roadside Plugging-Filling Mining Method and Overlying Rock Mechanical Mechanism Analyses

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