循环荷载作用下煤变形及渗透特性的试验研究

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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.

Key words： rock mechanics cyclic load temperature permeability deformation characteristics

Received: 22 March 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I2/225

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