[1]李鸿儒,王志亮,郝士云.主动围压下花岗岩动态力学特性与本构模型研究[J].水文地质工程地质,2018,45(03):49.[doi:10.16030/j.cnki.issn.1000-3665.2018.03.06]
 LI Hongru,WANG Zhiliang,HAO Shiyun.A study of the dynamic properties and constitutive model of granite under active confining pressures[J].Hydrogeology & Engineering Geology,2018,45(03):49.[doi:10.16030/j.cnki.issn.1000-3665.2018.03.06]
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主动围压下花岗岩动态力学特性与本构模型研究()
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《水文地质工程地质》[ISSN:1000-3665/CN:11-2202/P]

卷:
45卷
期数:
2018年03期
页码:
49
栏目:
工 程 地 质
出版日期:
2018-05-15

文章信息/Info

Title:
A study of the dynamic properties and constitutive model of granite under active confining pressures
文章编号:
1000-3665(2018)03-0049-07
作者:
李鸿儒王志亮郝士云
合肥工业大学土木与水利工程学院,安徽 合肥230009
Author(s):
LI Hongru WANG Zhiliang HAO Shiyun
School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, Anhui230009, China
关键词:
花岗岩围压应变率动力行为本构模型
Keywords:
granite confining pressure strain rate dynamic behavior constitutive model
分类号:
TU458+.3
DOI:
10.16030/j.cnki.issn.1000-3665.2018.03.06
文献标志码:
A
摘要:
为了研究花岗岩在不同围压、不同应变率下的动力学特性与本构行为,利用改进的分离式霍普金森压杆(SHPB),对其进行了试验测试,并将损伤统计理论引入鲍埃丁模型,对所得到的本构模型与试验数据进行拟合分析,进而探讨模型中各参数对应力-应变曲线的影响。结果表明:围压和应变率都能提升花岗岩的抗压强度,两者均与试样动态强度增长因子呈正相关,且围压的存在提高了岩石的塑性特性,应力-应变曲线上出现塑性屈服平台;主动围压下,试样的弹性模量有一定的提高,但总体上未见明显的率效应和围压效应;本文所构建的模型预测结果与不同围压下试样的应力-应变曲线均有较高的吻合度,可为相关工程设计与施工提供一定参考。
Abstract:
In order to study the dynamic characteristics and constitutive behavior of granite under different confining pressures and different strain rates, experimental tests were conducted by using the improved Split Hopkinson Pressure Bar (SHPB), and a damage statistical theory was introduced into the Poynting model. The constitutive model and the experimental data were fitted and analyzed, and then the influence of each parameter in the model on the stress-strain curve was discussed. The results show that the confining pressure and the strain rate can enhance the compressive strength of the granite, both of which are positively correlated with the dynamic increase factor of the specimen, and the presence of confining pressure increases the plastic property of the rock specimen and a plastic yield platform appears on the stress-strain curve. The elastic modulus of the specimen under the active confining pressure is improved, but generally there is no obvious rate effect and confining pressure effect. The predicted results of this model are in good agreement with the measured stress-strain curves of the specimen under different confining pressures.

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备注/Memo

备注/Memo:
收稿日期: 2017-09-03; 修订日期: 2017-12-16
基金项目: 国家自然科学基金资助项目(51579062;51379147)
第一作者: 李鸿儒(1994-),男,硕士研究生,从事岩石动力学特性方面研究。E-mail:2276990712@qq.com通讯作者: 王志亮(1969-),男,教授,博导,主要研究方向为岩石动力学与爆破工程。E-mail:cvewzl@hfut.edu.cn
更新日期/Last Update: 2018-05-15