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| DEVELOPMENT OF SHEAR-FLOW COUPLING TEST DEVICE
FOR COAL ROCK |
| XU Jiang1，2，LIU Yixin1，2，YIN Guangzhi1，2，LI Bobo1，2，PENG Shoujian1，2，YE Guibin1，2 |
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；
2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400044，China) |
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Abstract The structure and function of self-developed coal rock shear-flow coupling test device in great detail were presented. This device system consists of five parts：the servo control system，the source of fluid loading system，shear box and its sealing system，control and data acquisition system and the 3D scanning system for coal rock section. Among them，the self-developed shear sealing system can realize a good seal under high-performance and comprehensive experimental condition. The servo loading system can offer constant normal(shear) load，constant normal(shear) displacement loading mode，different loading rates and different displacement rates mode. And through control and data acquisition system，it can realize real-time monitoring of the whole process as well. For the source of fluid loading system，it can provide hydraulic pressure or air pressure up to 5 MPa and maintain stability. Using displacement sensor and deformation sensor to monitor the shear deformation of specimen and normal deformation can ensure the completeness of shear-flow coupling test under high precision. The 3D scanning system for coal rock section is used to collect the information of coal rock section，to further study the characteristics of failure section and coupling mechanisms of seepage. The test results of intact sandstone by this device show that the self-developed shear-flow coupling device can meet the expected functional requirement. It can ensure a stable test process and high accuracy of test data. It can be both used to study the hydraulic performance of joint rock mass and explore the landslide mechanism of rock slope，and perform the experimental study for the internal failure process of coal rock under the influences of original rock stress and mining dynamic pressure and the coupling mechanism of the permeability of coal gas.
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2015, Vol. 34 
