Abstract
The hanging of hard roof strata in the gob-side retaining entry in deep mines could lead to dynamic disasters. The pressure relief mechanism for the hard roof strata using shallow-hole blasting was investigated by a combined method of theoretical analysis, numerical simulation, and field test in the Sanhejian coal mine. The shallow-hole blasting model was established using LS-DYNA3D (Livemore software of explicit dynamics analysis code). The evolution and propagation law of effective stress induced by shallow-hole blasting was analyzed. The parameters related to shallow-hole blasting were determined via a combined method of numerical analysis and theoretical calculations. These were applied to the field tests. The effect of shallow-hole blasting on the strata control of deep gob-side retaining entry was studied by comparing two scenarios in the field: a deep gob-side retaining entry with and without shallow-hole blasting. It was found that the convergences of the entry decreased due to the shallow-hole blasting. This indicates that shallow-hole blasting is a good technique to maintain the stability of the gob-side retaining entry with a hard roof in deep mines.
Highlights
Gob-side retaining entry is widely used in China due to its various advantages of increasing recovery rate, reducing tunneling rate, reducing roadway maintenance cost, solving corner gas overrun, and increasing mining economic benefits
Retaining entry with a hard roof through a combined method of theoretical calculation, numerical analysis, This paper presents a case study on the mechanism of shallow-hole blasting technology for and field test. This studyentry waswith conducted on gob-side with hard roof in the Sanhejian gob-side retaining a hard roof through aretaining combinedentry method of a theoretical calculation, deep coal mine of
This will ensure the stability of the roof strata above the retaining entry and reduce the pressure on the roof strata above the retaining entry
Summary
Gob-side retaining entry is widely used in China due to its various advantages of increasing recovery rate, reducing tunneling rate, reducing roadway maintenance cost, solving corner gas overrun, and increasing mining economic benefits. Thecompetent gob-side retaining entry in subjected the superposition of high initial situ stress and strong mining-induced which makes it very difficult to maintain the stability of area, which will impose large pressure on stress, the backfill body and lead to large deformation and eventually the gob-side retaining entry in deep colliery. Retaining entry with a hard roof through a combined method of theoretical calculation, numerical analysis, This paper presents a case study on the mechanism of shallow-hole blasting technology for and field test. This studyentry waswith conducted on gob-side with hard roof in the Sanhejian gob-side retaining a hard roof through aretaining combinedentry method of a theoretical calculation, deep coal mine of Jiangsu. Improve the stability of gob-side retaining entry with hard roof strata and guarantee the safety and productivity of colliery
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