(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；3. The Branch Bureau of Land and Resources Management of Beibei，Chongqing 400700，China)
Abstract：To study the characteristics of deformation and permeability of coals under repeated disturbance of stresses，cyclic loading tests with different time lengths of stabilization were carried out using a servo-controlled triaxial seepage device which was developed in house. The loading and unloading stress-strain curves with different time lengths of stabilization form plastic hysteresis loops. As the time lengths of stabilization increased，the initial permeability reduced slowly but the trends of variation of the permeability remained the same. The permeability decreased with the increasing of the principal stress. The maximum axial strain of coal decreased initially and then increased as the time lengths of stabilization increased and it reached the minimum value at the time lengths of stabilization of 100 s. The minimum permeability of coal increased initially and then decreased and it reached the maximum value at the time lengths of stabilization of 100 s. The permeabilities of coals are closely related to the development of axial deformation. The variations of permeability were always lagged behind that of the volumetric strains. The lagged time lengths increased with the increasing of the time lengths of stabilization.
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2014, Vol. 33 
