ResearchArticle Research on the Effect of Particle Distribution on the Crack Propagation in Shaped Energy Blasting Based on the Smoothed Particle Hydrodynamics Pengfei Guo , 1,2 Xiaohu Zhang, 3 Weisheng Du, 4 Xiaochun Xiao , 1 and Dingjie Sun 1 1 School of Civil Engineering, Shaoxing University, Shaoxing 312000, China 2 State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China 3 School of Civil Engineering, Guizhou University of Engineering Science, Bijie, Guizhou 551700, China 4 Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China Correspondence should be addressed to Pengfei Guo; gpf20101989@163.com Received 13 August 2019; Revised 3 December 2019; Accepted 18 December 2019; Published 11 January 2020 Academic Editor: Chengzhi Shi Copyright © 2020 Pengfei Guo et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conventional smoothed particle hydrodynamics (SPH) methods suffer from disadvantages, such as difficult initial particle configuration, uneven distribution of generated particles, and low computational efficiency when applied to numerical simulationofshapedchargeblasting.Inthisresearch,toovercometheseproblems,amodifiedSPHmethodthatgeneratesthe particle configuration through self-adaptive optimization is developed by the combined application of MATLAB and LS- DYNA.eresultspresentedinthispaperdemonstratethatthemodifiedconfigurationmethodsolvestheproblemofuneven distribution of particles in complex geometry domains by providing a more uniform smoothed particle distribution than the conventional SPH method. Furthermore, the results from the application of these two methods to the bidirectional-shaped charge blasting problem reveal that the defects in the particle configuration in the conventional SPH method lead to the development of main cracks in both the shaped and the unshaped directions. However, with the self-adaptive optimization method,themaincracksdeveloponlyintheshapeddirection.Inaddition,theequivalentstressdifferencebetweentheshaped andunshapeddirections,0.7msafterdetonation,is120MPawiththemodifiedmethod.isis85MPamorethanthatwiththe conventional method. 1. Introduction A comprehensive study on the principle of cumulative blasting and its effects began during World War II. Before the1980s,theresearchersinthisfieldfocusedontheprocess of jet penetration mechanism and modeling of cumulative blasting[1,2].Sincethe1980s,owingtothedevelopmentof experimental methods and computer technologies, there have been abundant research studies on the subject of shaped charges and their energy release process [3, 4]. Studiesonthecumulativeblastingtechnologythatenhances the blasting effect through changing the propagation me- dium of detonation wave and installing accessories on explosives, such as blasting by water-sealed explosive charge packages and notched blasting, have emerged subsequently [5, 6]. Due to the advances made in engineering software de- velopment, many researchers, nowadays, use commercial softwaretosimulatetheproblemsrelatedtoshapedcharges. Kim et al. [7] and Donze et al. [8] used the discrete element method to simulate the behavior of rocks during blasting andstudiedthepropagationbehaviorofstresswavesinrock mass under different loading conditions. Yang et al. [9] and FanandLi[10]usedDYNA3Dtostudythepresplittingwith a decoupling charge of a binding energy tube. eir results showed that the shaped tube had a significant effect on the Hindawi Shock and Vibration Volume 2020, Article ID 3892903, 14 pages https://doi.org/10.1155/2020/3892903