To acquire a satisfying cutting effect during medium-length hole blasting driving of rock tunnels, an improved wedge method with supplementary the center holes was proposed. Initially, cavity forming mechanism analyzed theoretically. The results suggested that could realize ejection within range from free face to critical depth, and hence reduce restraining force blasting, further accomplish ex...

Geotechnical Engineering is a branch of Civil Engineering which deals with man made materials (concrete, steel, etc) on top of or as inclusions into soils or rocks which are naturally made. The process of interaction between man made materials and the soils and rocks is through methods of construction which is time consuming. A construction process could take a week to several years, through wh...

Abstract Small-scale model blasting plays an important role in understanding mechanism of rock fragmentation by and improving blast technology mining engineering. Because a specimen (or model) often needs to be placed on either ground or another material blasting, additional interface appears between the material), compared with engineering that does not have such interface. In this paper, four...

The impact of blast-driven shocks on the safety and stability of the underground coal mines has been well established. The seismic imperfections resulting from blasting depend on the total explosive energy released during blasting and the closeness of the development tunnel face to the stope face. Also, the quality of the rock mass wherein the whole stope face is located might pose considerable...

Supercritical CO2 phase change fracturing technology has been widely used in rock engineering. However, the surface vibration characteristics induced by breaking have not sufficiently studied. In this paper, a model for calculating velocity supercritical was established based on time-domain recursive method, and reliability of verified using LS-DYNA nonlinear finite element software; blasting e...