Three Zones and Support Technique for Large Section Incline Shaft Crossing Goaf

Yu, Wenxin; Wang, Weijun; Wu, Genshui; Yu, Xianyang; Peng, Wenqing

doi:10.1007/s10706-017-0217-9

Cited by 17 publications

(12 citation statements)

References 4 publications

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“…Yang et al [40] obtained the failure mechanisms and stability control technology for a deep roadway with some soft rocks in the Xin'an Coal Mine in Gansu Province, China, and one new useful "bolt-cable-mesh-shotcrete+shell"-combined support was proposed to support the ventilation roadway. Yu et al [41,42] proved that the fracture expansion of the coal and rock mass caused its permeability to increase, weakening the surrounding rock strength. Then, they proposed a core support technology with a prestressed truss anchor cable to support the roadway.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Brittle-Ductile Response of a Heterogeneous Soft Coal Rock Mass under Multifactor Coupling

et al. 2019

Geofluids

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After a gas drainage event causes different degrees of initial porosity in the coal seam, the heterogeneity of the coal mass becomes much more obvious. In this paper, soft coal testing samples with different degrees of heterogeneity were prepared first by a new special experimental research method using hydrogen peroxide in an alkaline medium to generate oxygen. Then, a series of mechanical tests on the soft coal mass samples were carried out under multiple factor coupling conditions of different heterogeneities and confining pressures. The results show that with a low strength, the ductility failure characteristic and a kind of rheology similar to that for soft rock flow were reflected for the soft coal; i.e., the stress-strain curve of the coal mass had no apparent peak strain and residual strength. An interesting phenomenon was found in the test process: there was an upwardly convex critical phase, called the brittle-ductile failure transition critical phase, for the heterogeneous soft coal mass between the initial elastic compression phase and the ductile failure transition phase in the stress-strain curve of the coal mass. An evolution of the brittle-ductile modulus coefficient of the soft coal was developed to analyze the effect of the internal factor (degree of heterogeneity) and external factors (confining pressure) on the transition state of the brittle-ductile failure of soft coal. Further analysis shows that the internal factor (heterogeneity) was also one of the essential factors causing the brittle-ductile transition of soft coal.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Brittle-Ductile Response of a Heterogeneous Soft Coal Rock Mass under Multifactor Coupling

et al. 2019

Geofluids

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“…Especially in recent 10 years, some provinces have introduced corresponding environmental protection policies and regulations in succession, requiring the mining enterprises to have sound tailing disposal systems and preventing the land from collapse. With the development of mining, the strata and rocks show some corresponding mechanical changes and have a certain impact on the stability of rock mass [1][2][3][4][5]. is means that mine enterprises are not only required to build safe and reliable tailing ponds with proper scale, but also required to keep the maximum discharge reduction of the tailings, to remove the hidden dangers including dam break and leakage of tailing ponds.…”

Section: Introductionmentioning

confidence: 99%

Properties of Gobi Aggregate and Sulfide‐Rich Tailings Cemented Paste Backfill and Its Application in a High‐Stress Metal Mine

Deng

Liang

Huangfu³

2021

Advances in Civil Engineering

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This experiment studied the influence law of the strength of CPB affected by tailings content, Gobi aggregate content, cement content, and slurry concentration. The results show, for the CPB with concentration of 77%, when the addition amount of cement reaches 20%, the addition amounts of tailings and Gobi aggregate change within the ranges of 12∼24% and 56∼68%, respectively. The strength of CPB has been gradually improved when the addition amount of Gobi aggregates decreases and the addition amount of tailings increases. In this case, the slump of CPB changes within the range of 26.5 cm∼26.9 cm while the strength of CPB changes within the range of 4.021∼6.845 MPa. Considering future utilization value of tailings, the addition amount is finally set at 16% in production, and the addition amount of Gobi aggregate is set at 64%; namely, tailings: Gobi aggregate = 20 : 80. When the addition amount of cement is 20% (cement/(tailings + Gobi aggregates) = 1 : 4), the strength of CPB reaches 5.62 MPa which meets the production requirement. When the heading machine is used for tunnelling mine roadway in bottom backfill of VCR stope, no collapse or delamination occurs without support, showing good stability and integrity of backfill. When the adjacent stope ore is mined, the backfill with cement content of 11.1%, 14.3%, 20%, and 25% is exposed. In the process of mining, no collapse or delamination occurs. Therefore, the proportion of various backfill materials applied in production is reasonable, being verified by the experiment and field test.

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“…In case of coal seam mining, the stresses of the surrounding rocks are redistributed, causing loosening deformation and failure fractures [10][11][12]. When the waterconducting fractures connect with a water body, such as an aquifer or confined water near the coal seam, the water would flow into the roadway, resulting in water inrush accidents at mines [13][14][15]. Currently, retaining a waterproof coal pillar is considered to be the most effective method for water conservation mining.…”

Section: Introductionmentioning

confidence: 99%

Research on the Reasonable Width of the Waterproof Coal Pillar during the Mining of a Shallow Coal Seam Located Close to a Reservoir

Zhao

Lü

et al. 2019

Advances in Civil Engineering

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Retaining a waterproof coal pillar is the most effective water conservation method for coal seam mining close to a reservoir, and determining a reasonable width for the waterproof coal pillar has been a common problem among mining scholars for a considerably long time. In case of mining a 4−2 coal seam close to the Changjiagou Reservoir in the Zhangjiamao mine, the research methods of theoretical analysis, physical simulation using similar materials, and numerical simulation have been adopted to analyze the overburden strata mining failure features and the surface subsidence law. Additionally, the influences of the width of the coal pillar on the reservoir bank slope stability have been investigated. The results denote that a coal pillar can be divided into a mine-pressure-influenced zone, an effective waterproof zone, and a water-level-influenced zone with respect to water resistance. Furthermore, the width of the waterproof coal pillar was determined to be 107.41 m by theoretical analysis. The simulation test indicated that when the working face advanced close to the reservoir, the reservoir bank exhibited vertical downward as well as transverse abscission layer fractures and the divided topsoil slipped toward the reservoir. Subsequently, the judgment conditions required for determining the critical width of the waterproof coal pillar were proposed based on the requirements to prevent the reservoir bank slope from instability failure and the water gushing accident in goaf. The maximum width of the waterproof coal pillar when the top point on the slope surface experienced reverse horizontal displacement and several key points produced sharp vertical displacements or when the pore pressure in the coal seam roof and floor suddenly became 0 was considered to be the critical width. Furthermore, the critical width was determined to be 96 m via simulation analysis, verifying the rationality of the theoretical method. These results could provide a theoretical basis for determining the width of the waterproof coal pillar of the coal seam located close to a reservoir.

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Three Zones and Support Technique for Large Section Incline Shaft Crossing Goaf

Cited by 17 publications

References 4 publications

Experimental Study on the Brittle-Ductile Response of a Heterogeneous Soft Coal Rock Mass under Multifactor Coupling

Experimental Study on the Brittle-Ductile Response of a Heterogeneous Soft Coal Rock Mass under Multifactor Coupling

Properties of Gobi Aggregate and Sulfide‐Rich Tailings Cemented Paste Backfill and Its Application in a High‐Stress Metal Mine

Research on the Reasonable Width of the Waterproof Coal Pillar during the Mining of a Shallow Coal Seam Located Close to a Reservoir

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