渗透水压力作用下软岩蠕变特性及变参数蠕变模型

发布时间：2018-02-24 23:00

本文关键词： 安全工程渗透水压力蠕变变参数软岩　出处：《安全与环境学报》2016年03期 　论文类型：期刊论文

【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。
[Abstract]:Aiming at the problems of large creep deformation and easy water inrush in extremely soft rock roadway under permeable water pressure, oil shale is selected as soft rock sample, and the method of combining indoor creep test with theoretical analysis is adopted. The creep characteristics of soft rock under permeable water pressure are analyzed, and the damage creep model of soft rock with variable parameters considering permeable water pressure is established. The results show that with the increase of stress level, the initial creep rate increases, and the time required to enter the steady state creep stage is prolonged. The instantaneous strain increases linearly, the creep deformation of rock decreases first and then increases with the increase of permeable water pressure, which indicates that the permeable water pressure increases the creep deformation ability of rock. The creep parameters are retrieved by using the universal Levenberg-Marquardt global optimization method in 1st-opt. The theoretical curves are in good agreement with the experimental curves, which indicates that the proposed model is reasonable.
【作者单位】：辽宁工程技术大学力学与工程工程学院;
【基金】：国家自然科学基金青年基金项目(51404130) 教育部博士点基金项目(20122121120004) 大学生创新创业训练计划项目(201410147008)
【分类号】：TD313

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