Dynamic response and failure behavior of rock under static-dynamic loading

被引:23
作者
Chen, F [1 ]
Ma, CD [1 ]
Xu, JC [1 ]
机构
[1] Cent S Univ, Testing Ctr, Changsha 410083, Peoples R China
来源
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY | 2005年 / 12卷 / 03期
关键词
dynamic response; rock; static-dynamic loading; strain rate;
D O I
10.1007/s11771-005-0160-4
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Dynamic response and failure behavior of rock under static-dynamic loading were studied. The effects of initial static load on the total energy dissipated during the failure process of specimen were analyzed. To simulate the engineering situation that in-situ rock experienced and obtain the dynamic loading with an intermediate strain rate, a low cycle fatigue load with the frequency from 0.5 to 5 Hz was adopted by servo-controlled Instron material testing system. The results show that the obtained strain rate increase with the increase of load frequency. The initial static load has great influence on both the energy and dynamic response of rock. Both the energy and the maximum failure load P-f decreases with the increase of initial static load. Pf under the static-dynamic loading is larger than that under only the static loading but less than that under only the dynamic loading. The load-displacement curves become nonlinear as the pre-added static load reaches the transition point which is about one third of static strength. With the increase of initial static load, Young's modulus decreases and poisson ratio increases. It shows that rock has a lower strength and a tendency to soften under a higher initial static load. Rock may be broken more easily static-dynamic loading than under only the dynamic loading. The proposed method is useful in the investigation of constitutive relationship and failure behavior of rock under quasi-dynamic loading.
引用
收藏
页码:354 / 358
页数:5
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