| 李晓彤,周跃进*,王明宇.循环载荷下滞回环与石膏损伤破坏性能的关系[J].实验力学,2018,33(2):194~200 |
| 循环载荷下滞回环与石膏损伤破坏性能的关系 |
| Research on the relationship between hysteresis loop and damage performance of gypsum under cyclic loading |
| 投稿时间：2017-09-04 修订日期：2017-10-24 |
| DOI：10.7520/1001-4888-17-180 |
| 中文关键词: 岩石力学 石膏 滞回环 饱水 破坏速率 |
| 英文关键词:rock mechanics plaster stone hysteresis loop filled water deformation speed |
| 基金项目:国家自然科学基金面上项目(51374201)；国家自然科学基金项目(51323004) |
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| 中文摘要: |
| 为了探求石膏的破坏与循环加卸载下滞回环面积的关系，石膏在自然以及饱水状态下滞回环的变化规律，以及滞回环面积与石膏强度的联系，利用CMT5305试验机对自然和饱水状态下的石膏进行单轴循环加卸载实验。对两种状态下石膏的应力-应变曲线进行分析，并计算出滞回环的面积，绘制出其面积变化曲线。结果表明，滞回环的面积随着加载载荷的增加而增加，且增长速率越来越快；饱水状态下的石膏滞回环面积明显小于自然状态下的石膏，且破坏方式和破坏程度不同于自然状态下的石膏；同一试样的两个相邻滞回环面积之差，代表了岩石损伤的速率，且石膏的损伤速率整体呈增加趋势。 |
| 英文摘要: |
| In order to explore the relationship between destruction of gypsum and area of hysteresis loop under cyclic loading and unloading and the hysteresis loop variation of gypsum in both natural and saturated state, as well as the link between hysteresis loop area and gypsum strength, uniaxial cyclic loading and unloading experiment was carried out respectively for gypsum in natural and saturated state by using a CMT5305 electronic universal testing machine. Then, the stress-strain curves of gypsum under two states were analyzed, and the area of hysteresis loop was calculated and the curve of area variation was drawn. Results show that the area of hysteresis loop increases with the increase of loading load, and the growth rate is faster and faster. The hysteresis ring area of gypsum in saturated state is obviously smaller than that in natural state. The damage mode and damage degree of gypsum in saturated state are different from those in natural state. The difference of two adjacent hysteresis loops area from the same sample represents rock damage rate, and the overall damage rate of gypsum is increasing. |
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