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采用分级加/卸载方式对深井泥岩试件进行峰前/峰后单轴短时蠕变试验,得到了差异性较强的蠕变试验曲线。对峰前各级横向蠕变试验曲线的Ⅰ、Ⅱ阶段进行Burgers模型拟合,对峰后轴向/横向蠕变试验曲线暨再破坏后曲线进行Boltzmann函数拟合,得到相关性强的拟合函数并确定了待定系数。深井泥岩的峰后蠕变破坏强度达峰前常规蠕变破坏强度的95.72%,但维系时间短、可靠性低。深井泥岩于峰值后再承载至历史记忆值时,其总变形量明显增加、蠕变演变为变形主体,且其横向蠕变特性显著强于轴向蠕变特性,因此横向蠕变成为实际工程中围岩变形控制的重点。
The graded plus / unload method was used to test the short-time uniaxial creep test of deep mudstone specimen, and the creep test curve with strong difference was obtained. Burgers model fitting was performed on stage I and stage II of the transverse creep test curves at all levels before the peak, Boltzmann function fitting was performed on the post-peak axial / transverse creep test curves and the post-destructive curve to obtain a strong correlation Function and determine the coefficient to be determined. The post-peak creep failure strength of deep mudstone reaches 95.72% of the conventional creep rupture strength before peak, but the maintenance time is short and the reliability is low. When the deep mudstone is loaded to the historical value after the peak value, its total deformation increases obviously, the creep evolves as the main body of deformation, and the transverse creep characteristics are significantly stronger than the axial creep characteristics, so the lateral creep becomes the actual project Surrounding rock deformation control of the focus.