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| Development of a rock testing system with changeable stiffness and its application in the study on the rock failure mechanical behavior
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| ZHAO Tongbin1，2，YIN Yanchun1，2，TAN Yunliang1，2，XING Minglu1，TANG Xingxue1，LI Charlie Chunlin3 |
| (1. College of Energy and Mining Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；2. State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；
3. Department of Geoscience and Petroleum，Norwegian University of Science and Technology(NTNU)，Trondheim 7491，Norway) |
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Abstract The combinations and occurrence forms of coal seams and roof and floor strata are diverse. In laboratory study of the failure and deformation behavior of coal and rock，the stiffness differences of the roadway surrounding rock structures should be taken into account，which may provide a new method to reveal coal bump mechanism. This paper introduced a self-developed rock testing system with changeable stiffness. The main testing machine of this system is a combined structure of inner and outer frames. The change in the loading stiffness is achieved by using a stiffness servo control system to control the energy accumulation in the inner frame. The tests of the sandstone specimens under three different loading stiffnesses in the testing system show that the loading stiffness does not significantly affect either the uniaxial compressive strength or the Young?s modulus of the rock. However，the post-peak stress-strain curve of the rock becomes smoother and steeper when the loading stiffness decreases，and the stress drop rate increases. It is shown that the stress drop rate has a power function correlation with the loading stiffness. After the peak load，the inner frame of the testing system rebounds several times in high speeds. The magnitude of the instantaneous rebound speed and the rebound duration increase with the decrease of the loading stiffness. Both the mean rebound velocity and the total rebound deformation have power function correlations with the loading stiffness. The loading stiffness has little effect on the post-peak dissipated energy of the specimen，and has a power function relationship with the released energy of the testing machine. The rock testing system with changeable stiffness provides a new kind of testing equipment and technology for rock mechanical behavior testing under different loading stiffness combinations.
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2022, Vol. 41 
