| 不同应力比的循环荷载下砂岩变形损伤特性研究* |
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| 引用本文： | 郜欣,徐颖,李成杰,谢平,曹紊源.不同应力比的循环荷载下砂岩变形损伤特性研究*[J].中国安全生产科学技术,2021,17(11):60-64. |
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| 作者姓名： | 郜欣 徐颖 李成杰 谢平 曹紊源 |
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| 作者单位： | (1.安徽理工大学 土木建筑学院，安徽 淮南 232001；2.淮南矿业集团 顾北煤矿，安徽 淮南 232001) |
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| 基金项目： | * 基金项目: 国家自然科学基金项目（52074009） |
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| 摘 要： | 为探究循环荷载下砂岩试件的变形损伤特性，开展3种不同幅值下的循环加卸载试验，分析应力比对砂岩变形损伤与能量耗散特性的影响规律。结果表明:应力比越大，相邻加载段应变差越大，部分高应力下不可恢复的变形在低应力时有所恢复；当应力比为0.50和0.67时，各循环泊松比相差不大，介于0.231~0.247之间，而当应力比为0.88时，泊松比随循环数有增加趋势；应力比越大耗散能占比越大，试件吸收并转化为用于自身损伤的能量越大。高应力循环荷载下试件损伤逐渐积累，在衡量试件损伤变化时采用的耗散能只考虑了轴向残余应变与应力，忽略了径向变形的影响。
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| 关 键 词： | 应力比 循环加卸载 泊松比 能量演化 |
Research on deformation and damage characteristics of sandstone under cyclic load with different stress ratios |
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| GAO Xin,XU Ying,LI Chengjie,XIE Ping,CAO Wenyuan.Research on deformation and damage characteristics of sandstone under cyclic load with different stress ratios[J].Journal of Safety Science and Technology,2021,17(11):60-64. |
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| Authors: | GAO Xin XU Ying LI Chengjie XIE Ping CAO Wenyuan |
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| Affiliation: | (1.School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China;2.Gubei Coal Mine,Huainan Mining Group,Huainan Anhui 232001,China) |
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| Abstract: | In order to explore the deformation and damage characteristics of sandstone specimens under the cyclic load,the cyclic loading and unloading tests under three different amplitudes were carried out,and the influence of stress ratio on the deformation,damage and energy dissipation characteristics of sandstone was analyzed.The results showed that the greater the stress ratio,the greater the strain difference between adjacent loading sections,and part of the unrecoverable deformation under high stress was restored at the low stress.When the stress ratio was 0.50 and 0.67,the Poisson’s ratio of each cycle had little difference,ranging from 0.231 to 0.247.When the stress ratio was 0.88,the Poisson’s ratio increased with the number of cycles.The greater the stress ratio,the greater the proportion of dissipated energy,and the greater the energy absorbed by the specimen and converting into the energy needed for its own damage.The damage of specimen under the high stress cyclic loading gradually accumulated.When measuring the damage of specimen,the dissipated energy used only considered the axial residual strain and stress,and ignored the influence of radial deformation. |
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| Keywords: | stress ratio cyclic loading and unloading Poisson’s ratio energy evolution |
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