[1]余德运①,刘殿书①,何成龙②.考虑岩石应变率效应的DDA程序[J].爆破器材,2015,44(05):45-50,55.[doi:10.3969/j.issn.1001-8352.2015.05.011]
　YU Deyun,LIU Dianshu,HE Chenglong.An Improved DDA Method Considering the Strain Rate of Rock[J].EXPLOSIVE MATERIALS,2015,44(05):45-50,55.[doi:10.3969/j.issn.1001-8352.2015.05.011]
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考虑岩石应变率效应的DDA程序()
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《爆破器材》[ISSN:1001-8352/CN:32-1163/TJ]

卷:
44
期数:
2015年05
页码:
45-50,55
栏目:
安全与测试
出版日期:
2015-09-30

文章信息/Info

Title:
An Improved DDA Method Considering the Strain Rate of Rock
文章编号:
4945
作者:
余德运①; 刘殿书①; 何成龙②
①中国矿业大学(北京)力学与建筑工程学院（北京，100083）
②北京理工大学爆炸科学与技术国家重点实验室（北京，100081）
Author(s):
YU Deyun①;  LIU Dianshu①;  HE Chenglong②
①School of Mechanics & Civil Engineering, China University of Mining and Technology, Beijing (Beijing, 100083)
②State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (Beijing, 100081)
关键词:
非连续变形分析; 应变率;  数值模拟
Keywords:
discontinuous deformation analysis;  strain rate;  numerical simulation
分类号:
TD235;O342
DOI:
10.3969/j.issn.1001-8352.2015.05.011
文献标志码:
A
摘要:
针对原经典DDA程序在研究岩石动力学问题时不考虑岩石的应变率效应，在DDA程序中引入与岩石应变率相关的动态强度表达式，将块体间接触弹簧破坏准则发展为动态破坏准则，进而完善DDA程序对岩石动力学破坏问题的处理能力。用原DDA程序和改进DDA程序对动载作用下岩石单轴拉、压破坏实验进行模拟，两者的模拟结果对比分析表明：在不同的加载速率作用下，原DDA程序得到的失效应力和破坏形式基本没有变化，这与实验结果不相符。但是，在不同的加载速率作用下，改进的DDA程序得到破坏形式能与实验结果相符，且能体现动载作用下岩石动态强度随加载速率的提高而增大的强度特性。
Abstract:
In view of the problem without considering the strain rate effect ion in the study when the original classic DDA method analyzing the rock dynamics, the formula of rock dynamic strength associated with the strain rate was introduced into the DDA program, and the dynamic failure criteria, instead of the static contact spring failure criteria, was developed to improve the DDA program. Uniaxial tensile and uniaxial expressive experiments of rock were simulated by the original and improved DDA program, and the results were compared and analyzed. It shows that the failure stress and damage form of rock calculated by the original DDA program doesn’t change with different loading rates, which is inconsistent with the experimental results. While damage form of rock calculated by the improved DDA program is consistent with the experimental results, and it could reflect the strength characteristics of rock in that the dynamic strength increases with the increase of loading rate.

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备注/Memo

备注/Memo:
收稿日期：2015-03-20
基金项目：重复爆破荷载作用下岩石动态疲劳损伤特性研究（51374038）
作者简介：余德运(1981~)，男，博士后,主要从事爆破安全技术及数值仿真计算研究。E-mail: yudeyun2000@163.com
更新日期/Last Update: 2015-09-30