中文摘要：

针对渗透水压力作用下极软岩石巷道蠕变变形量大、容易突水等问题,选取油页岩为软岩试样,采用室内蠕变试验与理论分析相结合的方法,分析渗透水压力作用下软岩蠕变特性,建立了考虑渗透水压力的变参数软岩损伤蠕变模型。结果表明：随应力水平提高,起始蠕变速率增大,进入稳态蠕变阶段用时延长,瞬时应变以线性关系增加;在蠕变过程中,随渗透水压力增加,岩石蠕变变形量呈先减小后增加的趋势,表明渗透水压力增大了岩石蠕变变形的能力;采用1st-Opt中的Levenberg-Marquardt＋通用全局优化法反演蠕变参数,所得理论曲线与试验曲线吻合较好,表明所建模型合理。

英文摘要：

The present paper intends to propose a damage cvisc model in view of the initial creep stress threshold.For the research purpose,we have first of all used the Levenberg-Marquardt＋ general global optimization method of the First Opt to inverse the creep parameters and then analyzed the variation regulaity of the creep parameters G2 via the stress,time and the seepage pressure.And,next,we have managed to establish a creep constitutive model of the variable parameters soft rock damage on the basis of seepage pressure.The main conclusions we have gained can be shown as follows：with the increase of the stress level,the initial creep rate tends to increase,too.And,then,time would come entering a period of steady deformation in which the extension and instantaneous strain tend to increase in a linear relation.What is more,the deformation of the rock creep is likely to decrease first and then increase whereas the rock creep deformation tendency may increase with the increase of the seepage pressure in the creep process.And,more important is that the theoretical calculation proves well in accord with the experimental data,by which the axial pressure is 6.0 MPa and the confining pressure is1.5 MPa,with the seepage pressures being 0,0.3 MPa,0.5MPa and 0.7 MPa,respectively.Besides,the correlation coefficient of the fitting results proves rather high with R2 being over0.9.The aforementioned results of our calculation show that the nonlinear damage creep model we have proposed is reasonable and rational,as well as applicable when the initial creep stress threshold has been taken into consideration.