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| EXPERIMENTAL STUDY OF DEFORMATION AND SEEPAGE CHARACTERISTICS OF COAL UNDER CYCLIC LOADING |
| XU Jiang1，2，LI Bobo1，2，ZHOU Ting1，2，CAO Jie1，2，YE Guibing1，2 |
(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 Based on the self-developed triaxial servo-controlled seepage equipment for thermal-hydro- mechanical coupling of coal containing methane，the cyclic loading test is performed on coal samples under different temperatures. The results are shown as follows：(1) The area surrounded by hysteretic curve reduces gradually with temperature increase. In a single hysteresis curve，the relation curves between principal stress difference，permeability and axial strain present X-shape. In the same cycle，the axial strain and permeability decrease gradually with temperature increase. The axial deformation increases as the number of cycles increases in same temperature condition. (2) As temperature increases，the slope of curve in loading stage increases，the cumulative deformation reduces，which means the development rate of the irreversible process has been improved. (3) In different temperature conditions，the changes of strain and permeability in loading stage are not obvious during the entire cycle. In unloading stage，the strain and permeability change significantly in the first cycle，and strain curve begins to stabilize with increase of the number of cycles. When the number of cycles is the same in different temperature conditions，the volumetric strain increases gradually and the permeability decreases with increase of temperature.
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Received: 22 March 2013
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2014, Vol. 33 
