Abstract
This paper focuses on improving the blasting effect of the drilling and blasting method in the deep rock mass and solves the problems of blasthole collapse and misfire accident in the process of drilling and blasting construction of heading face. FEM software, ABAQUS, is used to simulate the stress distribution around the blasthole by extending a certain depth in the vertical direction of the shaft heading face. The sensitivity of different depths, different heading face sizes, and different lithologies on the horizontal stress distribution is analyzed by using a six-factor four-level orthogonal analysis method. The results show that the change of the radius of the heading face has the most considerable influence on the distance of the distressed zone and the stress concentration zone, followed by the lithology and the excavation depth. Also, the excavation depth has the most significant influence on the peak stress value. Through the industrial field experiment, the in situ stress of the shaft heading face is tested, and the numerical simulation results are consistent with the field monitoring results. The results reveal the law of stress distribution near the heading face, which can provide some reference for the design of blasthole depth in the drilling and blasting construction scheme.
Highlights
With the decrement of shallow mineral resources, the development of deep mineral resources cannot be delayed. e excavation of deep shafts has always been a difficult problem to be solved in the event of mineral resources [1]
Luo et al [4] based on the study of the stress distribution characteristics of the surrounding rock concluded that under the action of high ground stress, the plastic zone of the roadway gradually expands from the periphery to the depth. e pressure of the surrounding rock gradually increases in the plastic area in the deep direction
Qi et al [5] made some assumptions on the coal in front of the heading face, analyzed the stress distribution of the coal in front of the heading face from the mechanical point of view, and obtained the formula for calculating the length of the distressed zone to prevent an outburst
Summary
With the decrement of shallow mineral resources, the development of deep mineral resources cannot be delayed. e excavation of deep shafts has always been a difficult problem to be solved in the event of mineral resources [1]. Luo et al [4] based on the study of the stress distribution characteristics of the surrounding rock concluded that under the action of high ground stress, the plastic zone of the roadway gradually expands from the periphery to the depth. Yin et al [7] based on field experiments at the fully mechanized coal mining face studied the relationship between the number of drill cuttings, mine pressure, and gas pressure It shows that the mine pressure distribution law of the heading face after the pressure relief. Based on FLAC3D simulation, the deformation characteristics and plastic zone distribution of surrounding rock of these six typical roadways after excavation were studied, and the effects of different lateral pressure ratios on them were analyzed. Erefore, the problem prompted researchers to think about solutions and carry out similar parameter tests and mechanical analysis
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