Theoretical and technological exploration of deep in situ fluidized coal mining

Xie, Heping; Ju, Yang; Ren, Shihua; Gao, Feng; Liu, Jianzhong; Zhu, Yan

doi:10.1007/s11708-019-0643-x

Cited by 97 publications

(59 citation statements)

References 4 publications

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“…When the coal strength is less than the roof strength, the following assumptions are made: (1) the coal is a continuous, homogeneous, and isotropic elastic body; (2) the displacement and deformation of the coal pillar before yielding are small; (3) the shear failure of the coal pillar occurs, and the shear failure surface is parallel to the coal seam; (4) when the coal pillar yields locally, the yield area is regarded as the elastic limit state, and the coal body in the yield area is regarded as a linear elastic body; (5) there is no weak plane in coal pillar. Due to the accumulation of coal gangue at the bottom of goaf and the subsidence of coal pillar under the action of self-weight stress of overlying strata, the lower part of coal pillar can be regarded as in three-dimensional stress state, and its stability is strengthened.…”

Section: Study On Evolution Characteristics Of Stress Distribution Inmentioning

confidence: 99%

“…Among the main coal mining countries in the world, such as the United States, Australia, Germany, the United Kingdom, Poland, and Russia, other mining industries are relatively developed, while Germany and Russia enter deep mining earlier. There are 30 mines in Russia's Donbass mining area with mining depth of 1200-1350 m [1][2][3][4][5][6]. The average mining depth of a Polish coal mine is 690 m, and the deepest coal mine has reached 1300 m. The coal mining depth in Japan and Britain has reached 1125 m and 1100 m, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Evolution Characteristics of Floor Stress and Reasonable Layout of Roadways in Deep Coal Mining

Zhang

et al. 2021

Geofluids

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The safe and efficient mining of deep coal resources is severely restricted by the dynamic disasters caused by high gas and high ground stress. Taking a deep mine in China as the research background, a mechanical model of the front supporting stress with the working face was constructed through theoretical calculations. Based on the limit equilibrium theory, the stress distribution in the plastic zone and the elastic zone of the lateral working face was derived; based on semi-infinite plane mechanics model, the floor vertical and horizontal stress distribution was deduced. Then, the roadway surrounding rock stress and displacement field distribution evolution characteristics were revealed through numerical simulation. On this basis, the reasonable floor gas drainage roadway (FGDR) layout was determined: internal staggered layout was used with FGDR, the vertical distance to the working face is 20 m, and the horizontal distance to the working face end is 15 m; the open-off cut of FGDR was arranged in an external staggered layout, the vertical distance to the working face is 20 m, and the horizontal distance to the open-off cut of the working face is 15 m. It is an important practical significance for the layout of FGDR, the control of surrounding rocks, and the improvement of gas drainage effects under similar conditions through the research results.

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Section: Study On Evolution Characteristics Of Stress Distribution Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Evolution Characteristics of Floor Stress and Reasonable Layout of Roadways in Deep Coal Mining

Zhang

et al. 2021

Geofluids

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“…e existing research results show that with the increase in mining depth, the vertical stress continues to increase. e tectonic stress increases accordingly, forming a high stress condition of "high vertical stress and high tectonic stress" at a large buried depth, which easily leads to a series of problems such as large deformation, roof fall, rib spalling, and floor heave [5][6][7]. It brings hidden dangers to coal mine safety production.…”

Section: Introductionmentioning

confidence: 99%

Presplitting Blasting the Roof Strata to Control Large Deformation in the Deep Mine Roadway

Yang

Huang

et al. 2020

Advances in Civil Engineering

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As the mining depth increases, under the influence of high ground stress, the surrounding rock of deep mine roadways shows soft rock characteristics. Under the influence of mining disturbance at the working face, large deformation of the roadway has occurred. To control the large deformation of the roadway, many mines have adopted the form of combined support, which has continuously increased the support strength and achieved a certain effect. However, since the stress environment of the surrounding rock of the roadway has not been changed, large deformation of the roadway still occurs in many cases. Based on the theoretical basis of academician Manchao He’s “short cantilever beam by roof cutting,” this paper puts forward the plan of “presplitting blasting + combined support” to control the large deformation of the deep mine roadways. Without changing the original support conditions of the roadway, presplitting blasting the roof strata of the roadway, by cutting off the mechanical connection of the roof strata between the roadway and gob, improves the stress distribution of the roadway to control the large deformation. Through field tests, the results show that after presplitting blasting the roadway roof, the roadway roof subsidence is reduced by 47.9%, the ribs displacement is reduced by 45.7%, and the floor heave volume is reduced by 50.8%. The effect is significant.

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“…With the continuous reduction of shallow coal resources, coal mines in many areas have entered the mining stage featuring wells thousands of meters deep [1]. Deep coal mining is the main direction of coal mine development in the future [2,3].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Effect of Cementitious Grouting Pressure on Micro-Fracture Permeability for Rock Reinforcement Underground: A Lab Study

Wang

Ren

et al. 2020

Energies

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In grouting support projects, due to the small concealment of micro-fractures, the support effect often fails to meet design requirements. The percolation effect is a common factor that causes grouting failure, and the influence of grouting pressure on the percolation effect is very obvious. In this article, a design of a micro-fracture grouting experimental system is presented that can realize high-pressure grouting and then uses a variety of ultrafine cements to carry out high- and low-pressure grouting tests under different fracture opening conditions, thereby obtaining the grouting pressure and accumulated grouting weight during the grouting process. The results show that a combination of the grouting pressure curve and the cumulative grouting weight curve can determine whether the ultrafine cement will have a percolation effect. Increasing the grouting pressure can reduce the critical fracture opening value and also reduce the occurrence of the percolation effect. The research results provide a theoretical basis for the high-pressure grouting of micro-fracture rock masses and offer certain guiding significance for the design of high-pressure grouting support schemes.

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Theoretical and technological exploration of deep in situ fluidized coal mining

Cited by 97 publications

References 4 publications

Research on the Evolution Characteristics of Floor Stress and Reasonable Layout of Roadways in Deep Coal Mining

Research on the Evolution Characteristics of Floor Stress and Reasonable Layout of Roadways in Deep Coal Mining

Presplitting Blasting the Roof Strata to Control Large Deformation in the Deep Mine Roadway

Understanding the Effect of Cementitious Grouting Pressure on Micro-Fracture Permeability for Rock Reinforcement Underground: A Lab Study

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