Abstract
According to the characteristics of rock burst of high horizontal stress roadway floor, the rock burst mechanism of roadway floor was studied with the background of south track roadway Xing’an mine. Based on the deflection theory and energy principle of the slab, the mechanical model of the floor of the roadway under high horizontal stress was established, the stress and energy criteria of rock burst occurred in the floor of the roadway were deduced, the prevention and control measures of the floor pressure relief with large diameter borehole and concrete-filled steel tube pile support were put forward, and the key parameters were determined. By establishing a numerical model, the evolution law of plastic zone, horizontal stress, and elastic strain energy density of roadway floor with or without support is contrastively analyzed. The results show that the effective means to prevent and control the floor rock burst is to cut off the stress transfer path by weakening the hard floor to reduce floor energy accumulation so as to reduce the floor rock burst risk. Based on the above research, field tests were carried out, and the microseismic monitoring results showed that the floor pressure relief of large diameter boreholes and concrete-filled steel tube pile support effectively relieved the floor rock burst and guaranteed the safety and efficiency of roadway excavation. This technology can provide a reference for the prevention and control of floor rock burst of similar roadways.
Highlights
In all kinds of disasters faced by deep mining, rock burst, presents great destructive power [1,2,3]. e wide distribution of rock burst has attracted the attention of many scholars at home and abroad
Erefore, based on the engineering background of floor rock burst induced by the excavation of south track roadway in Xing’an mine, this paper derived the floor rock burst instability stress and energy criteria under high horizontal stress on the basis of the deflection theory and energy principle of the slab and proposed the support method of large diameter borehole pressure relief in-floor combined with CFST pile
In order to study the supporting effect of roadway pressure relief and stress barrier technology (Figure 9), a numerical model was established in FLAC3D software according to the engineering geological conditions of roadway in a four-level working face. e numerical model simulates the influence of large diameter borehole pressure relief and concrete-filled steel tube stress barrier technology on the evolution law of stress and elastic strain energy of roadway floor and analyzes the floor rock burst prevention effect of roadway floor
Summary
In all kinds of disasters faced by deep mining, rock burst, presents great destructive power [1,2,3]. e wide distribution of rock burst has attracted the attention of many scholars at home and abroad. E research results of the above scholars achieved better prevention and control effects in the roadway of rock burst These studies are mainly based on the occurrence conditions or principles of rock burst itself, lack of support for floor rock burst. Erefore, based on the engineering background of floor rock burst induced by the excavation of south track roadway in Xing’an mine, this paper derived the floor rock burst instability stress and energy criteria under high horizontal stress on the basis of the deflection theory and energy principle of the slab and proposed the support method of large diameter borehole pressure relief in-floor combined with CFST pile. The prevention and control mechanism of floor rock burst of depressurization and support roadway is discussed in-depth, and field tests and verification are carried out
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