Abstract
Rock mass blasting is a complex process that involves the coupling of both discontinuous and continuous media. This paper aims to reveal the dynamic failure process between adjacent boreholes under an elliptical bipolar linear charge structure using the SPH-FEM (smooth particle hydrodynamics and finite-element method) coupling algorithm numerical simulation method. The numerical simulation results are compared with the existing experimental results, which proves the rationality of the algorithm. According to the numerical simulation results, the shaped jet will first shock the hole wall and form a stress concentration zone that will guide the formation of cracks during the stress wave propagation process. In the case of double-hole blast loading, there is a tendency for cracks coalescence to develop between adjacent boreholes due to the superposition of stresses between the double holes and the increase in damage and plastic strain. The best blasting results will be achieved with this structure when the distance between adjacent holes is 110 cm. Finally, the superiority of elliptical bipolar linear blasting in engineering blasting was verified through field experiments. The results of this study provide a reference for subsequent applications of elliptical bipolar structures in the field of rock blasting.
Highlights
Solid rock often exists in complex geological environments in large-scale tunnelling and excavation projects, so the drilling and blasting method is still the main construction method for rock tunnel excavation
The blasting construction method represented by concentrated energy directional blasting has shown great superiority in large-scale excavation projects such as mineral development and tunnel excavation. e elliptical bipolar linear shaped charge blasting has been applied to many engineering projects
To reflect the deformation characteristics of rock masses under shaped charge directional blasting, Foster [5] proposed in the early 20th century excavating an axial groove near the borehole wall in advance to control the direction of crack propagation after blasting
Summary
Solid rock often exists in complex geological environments in large-scale tunnelling and excavation projects, so the drilling and blasting method is still the main construction method for rock tunnel excavation. E elliptical bipolar linear shaped charge blasting has been applied to many engineering projects. There are few studies on the blasting theory of elliptical bipolar linear shaped charge blasting and the law of crack propagation. To reflect the deformation characteristics of rock masses under shaped charge directional blasting, Foster [5] proposed in the early 20th century excavating an axial groove near the borehole wall in advance to control the direction of crack propagation after blasting. Shaped energy blasting originated early in Europe and began to be mainly used in the military industry. It has received attention and research from various countries during the First and Second World Wars [7, 8]. It has received attention and research from various countries during the First and Second World Wars [7, 8]. e Swedish scholar Bjarnholt et al [9] introduced the structure of shaped charge into rock blasting and achieved good results in the field of rock blasting, which promoted the
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