文献类型：期刊文献

英文题名：Numerical Simulation Research on Crack Bifurcation Mechanism of Bidirectional Cumulative Tensile Blasting

作者：Guo, Pengfei[1,2];Ye, Kengkeng[1];Zhang, Xiaohu[3]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China;[3]Guizhou Univ Engn Sci, Sch Civil Engn, Bijie 551700, Guizhou, Peoples R China

年份：2020

卷号：2020

外文期刊名：ADVANCES IN CIVIL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000538019500001)、、Scopus(收录号：2-s2.0-85085888779)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Grants nos. 51904188 and 41602308), the Open Fund of State Key Laboratory for GeoMechanics and Deep Underground Engineering (Grant no. SKLGDUEK1821), and Research and Development Project of Guizhou University of Engineering Science (Grant no. G2018016). In addition, thanks are due to all the people who contributed to the research and the manuscript.

语种：英文

外文摘要：Shaped energy blasting has been widely used in the field of geotechnical engineering because of its good orientation and high energy utilization. However, the bifurcation of cracks in the direction of energy accumulation seriously affects the precracking effect in the direction of energy accumulation. In order to study the influence of the shaped energy angle on the crack propagation and bifurcation in the direction of energy accumulation, this paper used theoretical analysis and numerical simulation to study the influence of the energy angle on the crack propagation law in the energy-concentration direction. It was found that the energy release rate in the direction of energy accumulation after blasting was the main determinant of crack propagation and bifurcation in the direction of energy accumulation, and it decreased with the increase of the shaped energy angle. When the energy release rate in the direction of energy absorption exceeded a certain critical value, the stress intensity factor K at the crack tip would be affected by the impact load more than the bifurcation toughness K-B, resulting in bifurcation of the crack in the direction of the energy. The SPH method was used to simulate and analyze the energy blasting of four different shaped energy angles. The results show that as the shaped energy angle increases when the shaped energy angle is greater than or equal to 35 degrees, the cracks in the direction of energy accumulation after blasting are bifurcated, two cracks at the crack tip. When the shaped energy angle is less than 24 degrees, only one horizontal crack is generated in the direction of shaped energy, which is in good agreement with the theoretical analysis. The research in this paper will provide a certain research basis for the design of the blasting device and the optimization of the blasting effect.