摘要
为了研究软岩蠕变变形过程中岩体抵抗变形能力降低的程度,将岩石变形破坏过程中切线模量相对于初始模量的改变量与初始模量的比值定义为刚度系数折减率,分析了软岩单轴压缩荷载及软岩蠕变变形过程中刚度系数折减率的变化规律。软岩单轴压缩荷载下,切线模量随着应变的增大而逐渐降低,刚度系数折减率随着应变的增加而逐渐增大,即随着变形的增大,软岩试件抵抗变形的能力逐渐降低。软岩蠕变过程中刚度系数折减率曲线也可以划分为三个阶段:在初始蠕变阶段瞬时弹性变形使得软岩刚度系数折减率迅速降低;在等速蠕变阶段平稳下降之后进入加速蠕变阶段,下降速率迅速增大。软岩刚度系数折减率的分析可为岩体蠕变过程中变形特性及变形控制分析提供理论依据。
In order to study the capability of resistance to deformation of the soft rock in the process of creep deformation,the ratio of tangent modulus to initial modulus is defined as the reduction rate of stiffness coefficient and the change law of stiffness coefficient reduction rate during uniaxial compression of soft rock and creep deformation of soft rock is analyzed.Under uniaxial compressive loading,the tangent modulus decreases with the increase of strain and the reduction rate of stiffness coefficient increases with the increase of strain.That is to say,the resistance to deformation of soft rock specimen decreases with the increase of deformation.The curves of stiffness coefficient reduction rate can also be divided into three stages in the creep process of soft rock.Instantaneous elastic deformation in the initial creep stage makes the stiffness coefficient reduction rate of soft rock decrease rapidly,and it decreases steadily in the constant creep stage,and increases rapidly in the accelerated creep stage.The analysis of the reduction rate of stiffness coefficient of soft rock provides a theoretical basis for the analysis of deformation characteristics and deformation control in the process of rock creep.
作者
赵娜
王来贵
Zhao Na;Wang Laigui(College of Mechanics and Engineering,Liaoning Technical University,123000,Fuxin,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2019年第5期1179-1182,1264,共5页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金面上项目(51474121)
国家自然科学基金青年基金项目(51304108)
国家重点研发计划(2017YFC1503102)
辽宁省教育厅科学研究一般项目(LJYL035)
关键词
刚度系数折减率
软岩
蠕变
损伤
reduction rate of stiffness coefficient
soft rock
creep
damage
