摘要
为探讨端部效应对砂岩单轴压缩蠕变试验的影响,采用试验、理论、数值模拟相结合的方法,获得砂岩试件在恒定应力下的蠕变曲线,分析有、无端部效应时砂岩模型在蠕变过程的应力、应变及塑性区分布特征.研究结果表明:与未控制端部的模型相比,控制端部的模型其轴向应力、径向应力在中部出现明显应力集中区,轴向蠕变变形随着与顶面距离的增大而减小,径向蠕变变形随着与顶面距离的增大而增大.控制端面的砂岩试件模拟结果与实验结果更为一致.研究结论为深入研究端部效应对蠕变试验结果影响规律提供参考依据.
In order to investigate the effect of the end effect on the creep test of sandstone under uniaxial compression,a combination of experimental,theoretical and numerical simulation methods was used.Then creep curves of sandstone specimens were obtained.Moreover,the distribution characteristics of stress,strain and plastic zone of sandstone model with and without end effect were analyzed in the creep process.The results of study show that compared to the model with uncontrolled ends,the model with controlled ends has significant stress concentrations in the middle of the axial and radial stresses.The axial creep deformation decreases with increasing distance from the top surface,while the radial creep deformation increases with increasing distance from the top surface.And the simulation results of sandstone specimens with the control end are more consistent with the experimental results.This provides a reference basis for further studying the effect of the end effect on creep test results.
作者
苏荣华
马志远
薛佳琪
SU Ronghua;MA Zhiyuan;XUE Jiaqi(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2022年第1期27-34,共8页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金(51474120)
关键词
端部效应
单轴压缩
蠕变特性
砂岩
分级加载
end effect
uniaxial compression
creep characteristics
sandstone
graded load
