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通过一系列砂岩、页岩和辉绿岩室内蠕变试验,获得了不同应力和初始应变状态下岩石蠕变特性。通过误差分析讨论了计算蠕变速率时如何选择时间增量。讨论了复杂加、卸载条件下时间相关蠕变模型的局限性,提出采用不可恢复应变作为内变量来描述复杂条件下岩石蠕变性质,并据此提出了岩石的内变量蠕变模型。试验数据与模型拟合结果对比表明,内变量蠕变模型较好地反映了3种岩石的蠕变行为。此外,还初步讨论了模型在岩石率相关性质研究中的适用性,并利用相关试验数据进行了验证。
Through a series of indoor creep tests of sandstone, shale and diabase, the rock creep characteristics under different stress and initial strain were obtained. Through error analysis, we discuss how to choose time increment when calculating creep rate. The limitations of the time-dependent creep model under complex loading and unloading conditions are discussed. The non-recoverable strain is taken as the internal variable to describe the rock creep property under complex conditions. Based on this, the internal creep model of rock is proposed. The comparison between the experimental data and the model fitting results shows that the creep model of internal variables better reflects the creep behavior of the three kinds of rocks. In addition, the applicability of the model in the study of rock-related properties is also discussed preliminarily, and the relevant experimental data are used to verify the model.