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| Experimental study on failure process and mechanism of marble containing natural hard structural plane |
| SU Fangsheng1，2，PAN Pengzhi1，2，3，GAO Yaohui1，2，FENG Xiating1，3，LIU Chang1，2 |
(1. State Key Laboratory of Geomechanics and Geotechanical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. School of Resources and Civil Engineering，Northeastern University，Shenyang，Liaoning 110819，China) |
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Abstract In order to investigate the initiation，propagation and coalescence of the natural stiff discontinuity，a series of uniaxial compression tests were carried out on two types of jointed marbles with different mineral contents and the evolution of rock deformation was captured using the digital image correlation(DIC) technique. Moreover，the scanning electron microscope(SEM) technique was used to study the characteristics of strength and deformation of jointed rock and failure mechanism as well as the structure-control effect. It was found that the whole mechanical properties of rock specimen were influenced by the relationship of the mineral contents between the discontinuity and host rock，that the strength of the rock specimen would decrease and the deformation was little when their mineral contents were different largely，and that the attitude of the discontinuities would take control of the rock fracture process when their mineral contents were similar. Based on the deformation field and strain field，it was better to describe the process of rock discontinuity from weak and non-continuous failure to strong and non-continuous failure. The existence of rock discontinuity did not make the rock specimens characterized with non-continuous properties during the initial loading stage. The rigid structure plane was less deformed before the destruction，and the damage occurred in a short time，resulting in the rapid release of energy. The results can help to explain the mechanical mechanism of rigid structure plane controlled rock burst.
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2018, Vol. 37 
