SHPB加载作用下考虑节理分形的闭合变形性质研究

黄金科学技术

SHPB加载作用下考虑节理分形的闭合变形性质研究

王卫华，李坤，严哲，唐修

中南大学资源与安全工程学院，湖南长沙 410083

收稿日期:2015-12-22 修回日期:2016-06-23 出版日期:2017-02-28 发布日期:2017-05-12
通讯作者: 李坤（1990-），男，河南安阳人，硕士研究生，从事安全工程及岩石动力学研究工作。354146406@qq.com
作者简介:王卫华（1976-），男，湖南长沙人，副教授，从事岩体动力学、爆破及安全工程研究工作。50973993@qq.com
基金资助:
国家自然科学基金项目“冲击载荷下岩石节理本构方程及其对应力波传播的影响”（编号：41372278）资助

Study on the Closure Deformation Properties of Joint Fractal under SHPB Load

WANG Weihua，LI Kun，YAN Zhe，TANG Xiu

School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China

Received:2015-12-22 Revised:2016-06-23 Online:2017-02-28 Published:2017-05-12

摘要/Abstract

摘要：

为了探讨动载荷作用下的节理闭合变形性质，用水泥砂浆制作出含节理的人工试样，并采用SHPB装置对具有不同分形（JRC）的含节理试样进行不同加载率作用下的冲击试验，获得了不同加载率下具有不同Barton标准 JRC值的节理动态闭合变形曲线。冲击后试样及其结果分析显示：随着加载率的增加，碎裂的块数明显增加，表现出较强的加载率相关性；节理闭合变形曲线的变化趋势基本不受加载率的影响，节理变形量δ均随着应力σ的增大而增大。在加载速率相同的情况下，不同节理形貌试样的节理法向变形量存在较大差异；具有相同节理的试样在不同加载率作用下的闭合变形曲线也是显著不同的；无论加载率多大，δ和σ之间均具有很强的指数关系，可用统一的公式表达。该研究成果为进一步开展动载荷作用下节理闭合变形本构方程研究提供了试验基础。

关键词: SHPB, 节理分形, 节理闭合变形, 动载荷

Abstract:

In order to investigate the properties of joint closure deformation under dynamic loading，artificial specimens with joints are produced by using cement mortar，then，the impact test is carried out on joint specimens with different fractal dimension（JRC） under different loading rates by means of SHPB，and the dynamic deformation curves of joints with different Barton standard JRC values under different loading rates are obtained.Analysis of specimens and their results after impact test shows：With the increasing of loading rate，the number of fragmentation is increasing significantly，showing a strong correlation between number and the rate of loading；the change trend of joint closure deformation curve is not affected by loading rate；δ is increasing with the increasing of σ.Under the circumstance of same loading rate，there is a great difference about normal deformation among specimens with different joint morphology；the deformation curves of the specimens with the same joint under different loading rates are also different.No matter how fast the loading rate，there is a strong index relationship between δ and σ，which can be expressed in a unified formula.It provides the experimental basis for the further study of the constitutive equations of joint closure deformation under dynamic loading.

Key words: SHPB, joint fractal, joint closure deformation, dynamic load

王卫华，李坤，严哲，唐修. SHPB加载作用下考虑节理分形的闭合变形性质研究[J]. 黄金科学技术, 2017, 25(1): 75-83.

WANG Weihua，LI Kun，YAN Zhe，TANG Xiu. Study on the Closure Deformation Properties of Joint Fractal under SHPB Load[J]. Gold Science and Technology, 2017, 25(1): 75-83.

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