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为了研究灰质泥岩的蠕变特性,利用RLW-2000岩石流变试验机对灰质泥岩进行了分级加载三轴压缩蠕变试验。试验结果显示,随偏应力增大,灰质泥岩瞬时应变、蠕变应变及稳态蠕变率等均随之增大,且稳态蠕变率和偏应力的关系可用幂函数描述,但蠕变应变占总应变的比重增幅却非常缓慢;灰质泥岩蠕变过程具有非线性特征,其弹性模量随蠕变时间增加而逐渐减小,该变化过程可用Logistic函数反映。利用6元件扩展Burgers模型对试验结果进行了拟合,结果表明:拟合曲线和试验结果吻合良好,误差较小,说明该模型能够准确反映灰质泥岩的蠕变特性。
In order to study the creep characteristics of gray mudstone, graded loading triaxial compression creep test was carried out on gray mudstone with RLW-2000 rock rheology tester. The experimental results show that with the increase of deviatoric stress, the instantaneous strain, creep strain and steady creep rate of gray mudstone increase with the increase of deviatoric stress, and the relation between steady creep rate and deviatoric stress can be described by power function, but the creep The proportion of strain to total strain increases very slowly. The creep process of gray mudstone has a nonlinear characteristic. The elastic modulus decreases with the increase of creep time, which can be reflected by Logistic function. The Burgers model is used to fit the experimental results. The results show that the fitted curve is in good agreement with the experimental results and the error is small, which shows that the model can accurately reflect the creep characteristics of gray mudstone.