Reasonable gangue section length for disposing gangue pollutants in the new green mixed workface

Tai, Yang; Guo, Shuai; Lan, Lixin

doi:10.1007/s10064-019-01677-x

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…The compacting process in the caving zone of the goaf can adopt stress-strain equivalence. According to previous studies by scholars, the statistical regression formula of the height can be written as 21 :…”

Section: 2 | Constitutive Model Of the Caving Zonementioning

confidence: 99%

“…The compacting process in the caving zone of the goaf can adopt stress–strain equivalence. According to previous studies by scholars, the statistical regression formula of the height can be written as 21 :

{H}_{0}=100h/({c}_{1}h+{c}_{2}),

where the h denotes the mining height, with a unit of m, the c 1 and c 2 are the parameters related to the roof lithology 22 . Table 1 lists the height coefficients of the caving zone.…”

Section: Numerical Model For Precontrolling Rock Burst Via Ground Fra...mentioning

confidence: 99%

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An innovative technology of fracturing hard strata from the ground for precontrol of rock burst in a coal mine

Tai

Kuang

et al. 2022

Energy Science & Engineering

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Rock bursts are one of the most common dynamic disasters in coal mines and seriously affect safety production. At present, there are three common types of rock bursts: fault‐structure, fold‐structure, and thick/hard‐roof rock bursts. First, the paper proposed an innovative technology for mine ground fracturing to control those rock bursts. Then, for the new method, its fracturing devices, process, and monitoring technique for cracks were introduced. Next, we analyzed the detailed control procedures for those types of rock bursts and control principles of absorbing energy, blocking stress transmission, and reducing overall rock strength. To illustrate the control effect of ground fracturing for the rock bursts, we proposed a Voronoi block division method (VBDM) and multistrength criteria (MSC) consisting of Mohr–Coulomb Joint, Hoek–Brown Joint, and strain–stress equivalent method. Then, two numerical models using the VBDM and MSC were established. One is fault‐structure rock burst with ground fracturing and another is that without. From the numerical simulation, it was concluded that: (1) The ground fracturing will increase τ/σn, a ratio of shear stress to the normal stress of the fault, from 0.25 to 0.50, especially within 100 m of a working face to a fault. This situation indicates that ground fracturing will induce fault slip in advance, thus releasing energy in advance. (2) Fractured zones with low stress were formed by ground fracturing, which can reduce both upward extrusion pressure and normal stress, thereby triggering the fault slippage in advance. The energy released from the fault can be absorbed by the fractured zone, thereby controlling the advanced stress of the working face, and lowering the danger of rock burst.

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Section: 2 | Constitutive Model Of the Caving Zonementioning

confidence: 99%

{H}_{0}=100h/({c}_{1}h+{c}_{2}),

where the h denotes the mining height, with a unit of m, the c 1 and c 2 are the parameters related to the roof lithology 22 . Table 1 lists the height coefficients of the caving zone.…”

Section: Numerical Model For Precontrolling Rock Burst Via Ground Fra...mentioning

confidence: 99%

An innovative technology of fracturing hard strata from the ground for precontrol of rock burst in a coal mine

Tai

Kuang

et al. 2022

Energy Science & Engineering

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“…Some scholars have carried out in-depth research on the technology of strip filling, including the technical principle, the action mechanism and supporting effect between a strip-filling body and roof strata, the parameter design and the stability criterion of strip-filling structures. These studies have made some important research conclusions [19][20][21][22]. However, as a new type of filling technology, the current research on strip-filling technology is still in its infancy and has not yet formed a sound theoretical system and technical content.…”

Section: Introductionmentioning

confidence: 99%

Design of Key Parameters for Strip–Filling Structures Using Cemented Gangue in Goaf—A Case Study

Huang

Song

et al. 2023

Sustainability

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Large–scale underground coal mining is bound to cause serious surface subsidence problems. However, conventional filling and mining methods have problems such as high cost and process difficulty. In order to achieve the purpose of high efficiency and low cost, this paper proposes using the technology of CGSG. To achieve the effective control of overburden strata movement and ground surface settlement using cemented gangue strip filling in the goaf (CGSG), this paper studies the design principles and methods of the key parameters of the strip–filling structure including the strength, compressed deformation characteristics, and sizes. Based on the analysis of the structures and movement characteristics of the overburden strata above the coal seam, the mechanical relationship between the strip–filling structure and the overburden strata was established. Formulas for calculating the parameters of the strip–filling structure were derived. Guided by the obtained index parameters, the material ratios and mechanical experiments of the filling body were designed. The research results demonstrated that the strengths of the cemented gangue filling body at different ages should be greater than the compressive load of the strata roof movement on the filling body during the same period; under the compression of the maximum load, the ultimate compressive deformation of the filling body should be less than the ultimate subsidence deflection of the basic roof strata. The width of the strip–filling structure was inversely proportional to its ultimate strength, while the width of the non–filling area was greatly affected by the length of the rock beam formed after the basic roof strata fractured. The research results were applied in the No. 7402 experimental strip–filling workface in Zhaizhen coal mine, China. Reasonable parameters of the cemented gangue strip–filling structure were designed. The field application results demonstrated that, after using the technology of CGSG, there was no obvious pressure appearance when the working face was mined. The maximum sinking value of the ground surface was only 30 mm after the mining of the working face was completed; at the same time, the filling cost was about one–third less than the complete–filling technology in the goaf.

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“…Aiming at the engineering problems in Pingdingshan No.12 coal mine such as large discharge quantity of protective layer gangue, no accumulation space on ground, and insufficient production capacity, some scholars put forward a new partial backfilling mining method, namely, backfilling combined with caving fully mechanized mining (BCCFM) [13][14][15][16][17]. As a new partial backfilling method, the research on BCCFM mainly focuses on system layout and mining craft, while there are few studies on strata behavior and ground control of BCCFM.…”

Section: Introductionmentioning

confidence: 99%

Strata behavior and control strategy of backfilling collaborate with caving fully-mechanized mining

et al. 2020

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This article analyzes the technical difficulties in full-section backfill mining and briefly introduces the technical principle and advantages of backfilling combined with caving fully mechanized mining (BCCFM). To reveal the strata behavior law of the BCCFM workface, this work establishes a three-dimensional numerical model and designs a simulation method by dynamically updating the modulus parameter of the filling body. By the analysis of numerical simulation, the following conclusions about strata behavior of the BCCFM workface were drawn. (1) The strata behavior of the BCCFM workface shows significant nonsymmetrical characteristics, and the pressure in the caving section is higher than that in the backfilling section. φ has the greatest influence on the backfilling section and the least influence on the caving section. C has a significant influence on the range of abutment pressure in the backfilling section. (2) There exits the transition area with strong mine pressure of the BCCFM workface. φ and C have significant effect on the degree of pressure concentration but little effect on the influence range of strong mine pressure in the transition area. (3) Under different conditions, the influence range of strong mine pressure is all less than 6 m. This article puts forward a control strategy of mine pressure in the transition area, which is appropriately improving the strength of the transition hydraulic support within the influence range (6 m) in the transition area according to the pressure concentration coefficient. The field measurement value of Ji15-31010 workface was consistent with numerical simulation, which verifies the reliability of control strategy of the BCCFM workface.

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Reasonable gangue section length for disposing gangue pollutants in the new green mixed workface

Cited by 5 publications

References 32 publications

An innovative technology of fracturing hard strata from the ground for precontrol of rock burst in a coal mine

An innovative technology of fracturing hard strata from the ground for precontrol of rock burst in a coal mine

Design of Key Parameters for Strip–Filling Structures Using Cemented Gangue in Goaf—A Case Study

Strata behavior and control strategy of backfilling collaborate with caving fully-mechanized mining

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