Spalling strength of rock under different static pre-confining pressures

被引：52
|
作者：
Li Xibing [1 ]
Ming Tao [1 ,2 ]
Wu Chengqing [3 ]
Kun Du [1 ]
Wu Qiuhong [1 ]
机构：
[1] Cent South Univ, Sch Resources & Safety Engn, Changsha, Hunan, Peoples R China
[2] Western Min Co Ltd, Postdoctoral Sci Res Workstn, Xining, Qinghai, Peoples R China
[3] Univ Technol Sydney, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia
来源：
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING | 2017年 / 99卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Hopkinson bar; Spalling strength; Confining pressure; Laser detector system; DYNAMIC TENSILE-STRENGTH; SEMICIRCULAR BEND TECHNIQUE; CONCRETE-LIKE MATERIALS; FRACTURE ENERGY; ENHANCEMENT; PARAMETERS; STRESS; RATES;
D O I：
10.1016/j.ijimpeng.2016.10.001
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A testing method of spalling strength at different static pre-confining pressure is proposed in this paper. Using a modified split Hopkinson bar facility, a static pre-confining pressure was loaded before dynamic loading. The pull-back method is used to calculate the spalling strength and the free surface velocities of the specimen were measured by a laser detector system. The experimental results indicate that the spalling strength is related to the static pre-confining pressures. When the impact loading and rate effect are almost the same, the results demonstrated that the spalling strength decreases with an increase in the confining pressure. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：69 / 74
页数：6
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