恒应变率试验中岩石膨胀与应变能损耗特性的研究

借助广义品质因数和变形的归一化处理方法,分析了房山砂岩在10~(-5)/s恒应变率试验中膨胀和应变能损耗特征.结果表明,房山砂岩的膨胀伴随着应变能的迅速耗散,差应力-体应变曲线在膨胀阶段出现的反转点与应变能损耗曲线的特征点相对应.

DILATANCY AND STRAIN ENERGY DISSIPATION OF FANGSHAN SANDSTONE IN CONSTANT STRAIN RATE TESTS

According to the generalized quality factor function the authors analyse the dilatancy and energy dissipation after linear limit of Fangshan Sandstone under a constant axial strain （rate of 10-5 S-1）. The result shows that the dilatancy of Fangshan Sandstone accompanies a rapid stain energy dissipation. The maximum value of d （σ1-σ3）/(dεr is correlated with a special point of Q-1-εd curve, and indicates the beginning of a new procedure of strain energy dissipation. In order to compare dilatant strain for samples under different conditions, e.g., different confining pressures or degrees of saturation, the authors present a method for data normalization in this paper. Some results of experiments carried out by the authors show that it is a helpful way to study the dilatancy of rocks.