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采用TAW-2000电液伺服岩石三轴试验仪对海棠山隧道砂岩试样进行了分级加载蠕变试验,基于改进的西原模型建立了描述衰减蠕变与稳定蠕变阶段的变参数蠕变方程,并对蠕变参数的变化规律进行了拟合分析。研究结果表明,试验曲线与模型计算曲线相吻合,试样在低应力状态下的蠕变过程具有明显的衰减蠕变与稳定蠕变阶段,在高应力状态下出现加速蠕变阶段,但最终变形量小于常规三轴极限应变值。基于试验结果拟合出了不同应力状态下不同时刻的蠕变参数及蠕变参数随应力及时间变化的数学表达式,蠕变参数的变化能较好地反映衰减蠕变阶段与稳定蠕变阶段岩石结构的劣化过程,说明了该蠕变方程能较好地模拟砂岩衰减蠕变与稳定蠕变阶段的蠕变特性。
The TAW-2000 electro-hydraulic servo rock triaxial testing instrument was used to carry out the loading creep test for the sandstone samples of Haitangshan Tunnel. Based on the improved model of the West original, a variable parameter creep equation describing the decay creep and stable creep phases was established, The law of variation of creep parameters was fitted and analyzed. The results show that the experimental curve is in good agreement with the model calculation curve. The creep process of the sample under low stress has obvious decay creep and stable creep phases, and the accelerated creep phase occurs under high stress. However, the final deformation The amount is less than the conventional three-axis limit strain value. Based on the test results, the creep parameters and the mathematical expressions of creep parameters with stress and time under different stress states are fitted out. The changes of creep parameters can well reflect the decay creep phase and the stable creep phase The degradation process of rock structure shows that the creep equation can well simulate the creep characteristics of sandstone during decay and steady creep.