不同稳定时间对煤的变形及渗透特性影响试验研究

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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.

Key words： rock mechanics cyclic loads stabilization time permeability lagging effect

Received: 30 August 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I7/1388

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