Calculation and monitoring analysis of stress distribution in a coal mine gob filled with waste rock backfill materials

Meng, Lingkui; Zhang, Jixiong; Wu, Zhongya; Sun, Ke

doi:10.1007/s12517-019-4584-9

Cited by 17 publications

(6 citation statements)

References 19 publications

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“…The horizontal stress value increases when approaching the face decline shaft. The further away from the face the stress value decreases and approaches the rock mass stress value [17].…”

Section: Resultsmentioning

confidence: 96%

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The Effect of Stress Distribution Around The Decline Shaft on The Support System Stability in Underground Mining

Pradani

2021

JEMT

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The decline shaft is one of the main facilities in an underground mining work that is used as access to the mining panel from the surface. Making decline shafts on materials with weak characteristics is one of the important geotechnical issues that must be considered. The initial stage of making decline shaft holes is carried out on a relatively shallow ground surface or soil depth so that the horizontal stress that works is greater than the vertical stress. This excavation process will change the direction and magnitude of the initial stress from being in an equilibrium state to being disturbed. In addition to the stress on the rock mass, the condition of weak soil strength will affect the behavior and distribution of stresses working around the decline shaft hole. If the stress around the decline shaft exceeds the strength of the rock, there will be instability in the decline shaft so that strength is needed to control the existing stress.

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“…The horizontal stress value increases when approaching the face decline shaft. The further away from the face the stress value decreases and approaches the rock mass stress value [17].…”

Section: Resultsmentioning

confidence: 96%

“…The stress distribution around the opening can be calculated using the Kirsch (1898) equation. [17] derived the equations for radial stress (r), tangential stress (θ), and shear stress (r) around a tunnel with a circular cross-section.…”

Section: Field Of Discontinuitymentioning

confidence: 99%

The Effect of Stress Distribution Around The Decline Shaft on The Support System Stability in Underground Mining

Pradani

2021

JEMT

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“…Gangue backfill mining technology can dispose of the gangue directly into the goaf. This is one of the most reasonable ways to solve gangue problems from the perspective of the coordinated development of mining and environment protection [1][2][3][4][5]. The development of goaf backfill mining technology has been researched for nearly a hundred years.…”

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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“…e mechanical properties of backfill materials determine the control ability of backfill mining on the movement and deformation of overburden. At present, the studies on mechanical behavior of backfill materials have been systematically studied, including the axial stress-strain curve of the compacted cylinder [22,23], the creep relaxation [24], the influence of particle size ratio on the mechanical behavior [1], and the influence of confining pressure and lateral pressure on mechanical properties [25].…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model of Solid Backfill Materials and Numerical Simulation of Overburden Movement and Deformation in Backfill Mining

Zhang

et al. 2021

Shock and Vibration

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Solid backfill mining is an efficient and environmental-friendly coal mining technology, which can effectively solve the problems of coal gangue pollution, water resource loss, and surface subsidence. Based on the mechanical behavior of backfill materials in the compaction process, volume strain was used to express the deformation modulus, and a constitutive model of backfill materials was proposed in this study. The ABAQUS UMAT was used to develop the numerical calculation subroutine of the model. Finally, the rationality of the model was verified that simulated stress-strain curves of the backfill materials during the compaction process agree well with experiments. Based on the proposed constitutive model, the influence of three factors (the initial compaction rate of the filling body, the mining height, and the mining depth) on the key strata and surface subsidence was analyzed systematically. The results show that the initial compaction rate and the height of coal seams have significant influences on surface subsidence. When the thickness of topsoil is only changed and the structural composition and lithology of overburden are not changed, the mining depth has little influence on surface subsidence, but a significant influence on surface subsidence range. The influence of mining height and mining depth on the deformation of key strata of overburden and surface subsidence is approximately linear, while the influence of the initial compaction rate is nonlinear.

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Calculation and monitoring analysis of stress distribution in a coal mine gob filled with waste rock backfill materials

Cited by 17 publications

References 19 publications

The Effect of Stress Distribution Around The Decline Shaft on The Support System Stability in Underground Mining

The Effect of Stress Distribution Around The Decline Shaft on The Support System Stability in Underground Mining

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

Constitutive Model of Solid Backfill Materials and Numerical Simulation of Overburden Movement and Deformation in Backfill Mining

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