Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method

Gao, Hainan; Gao, Yubing; Wang, Jiong; Fu, Qiang; Qiao, Bowen; Wei, Xingjian; Zhang, Xingyu

doi:10.3390/app11167524

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…At 89-91 ms, the equivalent stress superimposed between holes and rows is obvious. There are stress weakening areas between the center line of the first row of blastholes and the second row of blastholes and between the first row of blastholes and the free surface (Emad et al, 2018;Gao et al, 2021). There is a strong stress concentration phenomenon at the center of the hole (Figures 5G,H).…”

Section: Analysis Of Equivalent Stress Propagation Processmentioning

confidence: 97%

Study on Blasting Technology for Open-Pit Layering of Complex Mine Adjacent to High and Steep Slope

Wang

et al. 2021

Front. Earth Sci.

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In China, mining blasting vibration has seriously threatened the safety and stability of high and steep rock slopes. In this paper, taking the east mining area of Jianshan Phosphorus Mine as the research background, combined with field survey, field blasting test, numerical simulation and theoretical analysis, we systematically studied the adjacent high-steep rock slope and the layered blasting technology of complex ore. Based on wide hole spacing blasting numerical simulation and field tests, the use of 8 × 4 m hole network parameters, oblique line hole-by-hole initiation method, detonator delay using 35 ms between holes, 65 ms between rows and 500 ms within the holes, the rock mass rate was reduced and the drilling workload was decreased. In addition, regression analysis was carried out on a large amount of vibration test data, and the attenuation law and propagation law of blasting vibration of adjacent high and steep slopes were predicted, which provided a reference for mine production blasting. By establishing a mathematical model of cumulative damage of rock mass blasting, it shows that the depth of impact of mining blasting on the slope of Jianshan open-pit was 0–3.6m, but the blasting did not cause overall damage to the adjacent high and steep slopes. In the future, this model can be used to predict rock damage caused by subsequent blasting.

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Section: Analysis Of Equivalent Stress Propagation Processmentioning

confidence: 97%

Study on Blasting Technology for Open-Pit Layering of Complex Mine Adjacent to High and Steep Slope

Wang

et al. 2021

Front. Earth Sci.

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“…And EAFRC technology, through the directional pre-splitting cut off the roof stress transfer, cut off the stress transfer between the roof of the entry and the roof of the mining area (Gao et al, 2021; Manchao et al, 2018). And it improves the stress environment of the retained entry surrounding rock, while using the collapse of the roof plate of the mining area of the gangue crushed expansion characteristics to fill the mining area, as shown in Figure 4(b).…”

Section: Principle Of Entry Automatically Formed By Roof Cuttingmentioning

confidence: 99%

Study on surrounding rock deformation and gas control of entry automatically formed by roof cutting in high-gas coal seam

Gao

et al. 2023

Energy Exploration & Exploitation

Self Cite

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Severe deformation of surrounding rock and excess-gas are the main problems faced in mining of high-gas coal seam. This paper analyzes the deformation characteristics and mechanical model of surrounding rock in high-gas coal seam, and proposes the control technology of surrounding rock deformation and gas prevention and control. Based on this, the entry automatically formed by roof cutting (EAFRC) surrounding rock control technology and constant resistance large deformation anchor cable (CRLDA) support control technology in Shaqu coal mine are put forward. At the same time, the surrounding rock stress and gas migration law of the working face under traditional mining method and EAFRC mining were compared and analyzed. Through the field engineering test, the monitoring and analysis of surrounding rock deformation and gas concentration, the average surrounding rock deformation of roof cutting roadway is 310 mm, and the gas concentration of retained roadway by roof cutting is 0.31%. Through the research in this paper, the surrounding rock stability and gas control of the working face have been realized, and the non-pillar mining of EAFRC has ensured the safe mining of high gas working faces, which provides a reference for the mining of similar mines in non-pillar mining. At the same time, the technical system of EAFRC in non-pillar mining was established, which promoted the development and application of non-pillar mining.

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“…In the above analysis, it can be seen that compared with the traditional gob-side entry retaining, the process of gob-side entry retaining by roof cutting is simple, and the reinforcement support, the temporary support of single pillar, and the gangue retaining are easy to operate [18,19]. The most difficult process link of gob-side entry retaining by roof cutting is the bidirectional energy blasting.…”

Section: Key Technology Of Gob-side Entry Retaining By Roof Cuttingmentioning

confidence: 99%

Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

Wang

et al. 2022

Sustainability

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In order to ensure the application of gob-side entry retaining by roof cutting for thick and hard sandstone roofs, the key technology of pre-split blasting was studied. The LS-DYNA was used to analyze the blasting effect of the energy-gathering pipe. Using the methods of theoretical analysis and numerical simulation, it was determined that the optimal cutting height was 16 m and the optimal cutting angle was 15°. The effect of pressure relief by roof cutting was verified by FLAC3D. It is proposed to use deep-hole loosening blasting to solve the problem of the sandstone with a thick hard roof being difficult to collapse. A group of loose blasting holes was designed to be arranged every 20 m in the gob-side roadway. The depth of the #1 blasthole was 47 m, and the angle to the horizontal direction was 20°; the depth of the #2 blasthole was 65 m, and the angle to the horizontal direction was 15°. A field test was carried out in the 7135 ventilation roadway of Qidong Coal Mine China. The on-site peeping results showed that the blasting with the energy-gathering pipe had a good effect of directional slitting. After deep-hole loosening blasting, the thick hard sandstone roof collapsed and filled the gob in time. The monitoring curves of the hydraulic support showed that the hydraulic support resistance of the working face in the side with roof cutting was much smaller than that of the side without roof cutting, and the effect of pressure relief by roof cutting was good.

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Study on Bidirectional Blasting Technology for Composite Sandstone Roof in Gob-Side Entry-Retaining Mining Method

Cited by 9 publications

References 22 publications

Study on Blasting Technology for Open-Pit Layering of Complex Mine Adjacent to High and Steep Slope

Study on Blasting Technology for Open-Pit Layering of Complex Mine Adjacent to High and Steep Slope

Study on surrounding rock deformation and gas control of entry automatically formed by roof cutting in high-gas coal seam

Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

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