ty -jour a2 -gong，fengqiang au -huang，shunjie au -meng，Xiangrui au -Zhao -Zhao，uning au -li -li，yingming au -yingming au -liu -liu -dong -dong，dong，chunliang au-Liu，Chongyan au -Zhou，Jun Py -2020 DA -2020/11/16 Ti-高压力软岩的蠕变机械级别的坡度卸载SP -8822265 VL -2020 AB-为了研究深软的蠕变行为选择岩石，灰度石作为研究主题，并使用岩石三轴流变仪（岩石600-50）和声发射（AE）系统（SH-II）在高压力下进行逐级卸载限制压力蠕变测试等级。测试结果表明，在初始高约束压力下，砂岩的横向蠕变行为比轴向蠕变更为突出。在相同的限制压力下，刺激应变速率（与应变相同）随着轴向压的增加而降低。如AE计数所示，AE信号是在整个测试过程中生成的，表明蠕变是“微动力学”过程。蠕变行为的特征是显着的狭窄压力效应。随着限制压力的降低，蠕变程度显着增加。在测试期间，AE能量总体上增加，但在蠕变期下降。 During the entire test process, the overall energy in the constant deviatoric stress grade unloading of the confining pressure was 45% higher than that in the constant axial pressure grade unloading. The degree of failure of the rock was different in these two unloading creep tests, and the constant axial pressure grade unloading of the confining pressure entails greater damage than the constant deviatoric stress grade unloading of the confining pressure. The main reason was that the former had a lower confining pressure level and longer creep process than the latter, and the sample was mainly characterized by creep damage and large cumulative damage, while the latter features mainly unloading damage. Through the inversion of the Burgers constitutive model and nonlinear damage constitutive model for the creep test curve, the nonlinear constitutive equation can better fit the accelerated creep stage, which suggested that this model can describe the accelerated creep characteristics of the high-stress soft rock. SN - 1687-8086 UR - https://doi.org/10.1155/2020/8822265 DO - 10.1155/2020/8822265 JF - Advances in Civil Engineering PB - Hindawi KW - ER -