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| COMPARATIVE EXPERIMENTAL INVESTIGATION ON DAMAGE PROCESS OF ROCK UNDER STATIC CYCLIC LOADING AND
REPEATED DYNAMIC IMPACT |
| DENG Guoqiang，YANG Xiumin |
| (No.4 Engineering Research Institute，General Staff Headquarters of PLA，Beijing 100850，China) |
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Abstract To investigate the characteristics of rock specimen under static cyclic loading and repeated dynamic impact，comparative tests are carried out on rock rigid test machine and SHPB device respectively，and the stress-strain relationships are also obtained respectively. It is very difficult to obtain the relationships of rock under repeated impact. Compare the relationships of specimen under two types of loading，except strain ratio effect，there are so many similar characteristics between them. Firstly，the damage process is progressive，which includes yield，crack and broken steps. Secondly the stress-strain relation profile can be classified as elastic，harden，soften and residual part. Lastly the bearing capacity and modulus are gradually decreased after maximum point. The comparative experimental investigations illustrate that the rock mechanical properties under repeated dynamic impact can be approximately made out through the results of static cyclic loading.
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Received: 19 May 2013
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2014, Vol. 33 
