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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第12期    总第304期    2019年12月

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文章编号:1672-7207(2019)12-3046-09
分级循环荷载下泥岩和砂岩的阻尼特性试验研究
王轲1,潘旦光1, 2, 3,鲁文艳1,陈钒1, 4

(1. 北京科技大学 土木与资源工程学院,北京,100083;
2. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京,100083;
3. 同济大学 土木工程防灾国家重点实验室,上海,200092;
4. 中电建路桥集团有限公司,北京,100048
)

摘 要: 为研究岩石在不同应力水平循环荷载作用下轴向与径向变形的应力应变滞后关系及径向阻尼比与轴向阻尼比的关系,在MTS815岩石力学试验系统上对饱和泥岩与饱和砂岩进行变幅分级循环荷载试验。研究结果表明:同一岩石在循环荷载作用下的径向滞回环与轴向滞回环形状保持一致;对于砂岩,在加载时应变相位超前于应力相位,在卸载时应变相位滞后于应力相位,由此导致滞回环加卸载段都呈下凸状;对于泥岩,在加载时应变相位同步或滞后于应力相位,在卸载时应变相位滞后于应力相位。应力幅值不变时,随着循环次数的增加,阻尼比趋向于稳定,应力幅值越大,阻尼比越大。泥岩的阻尼比大于砂岩的阻尼比,泥岩和砂岩的径向阻尼比都大于轴向阻尼比,且在循环加载的初始阶段,泥岩和砂岩的径向阻尼比增长速率较快。随着径向应变与轴向应变比的增大,径向阻尼比与轴向阻尼比的比值逐渐减小,两者之间的关系为线性关系。

 

关键词: 岩石动力学;变幅分级循环加载;滞回曲线;应力应变滞后关系;径向阻尼比;轴向阻尼比

Experimental study on damping characteristics of mudstone and sandstone under graded cyclic loading
WANG Ke1, PAN Danguang1, 2, 3, LU Wenyan1, CHEN Fan1, 4

1. Department of Civil Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China;
3. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
4. Power China Road Bridge Group Co. Ltd., Beijing 100048,China

Abstract:In order to study the relationship between radial and axial stress-strain hysteresis as well as radial damping ratio and axial damping ratio of rock under different cyclic stress loads, the variable-strain cyclic load test of saturated mudstone and saturated sandstone was carried out on MTS815 rock mechanics test system. The results show that the radial hysteresis loop of the same rock under cyclic loading is consistent with the shape of the axial hysteresis loop. For sandstone, the phase of strain is ahead of that of the stress during the loading process, and the phase of strain lags behind that of the stress during the unloading process, which makes the hysteresis loop unloading and unloading sections become convex; the phase of mudstone is synchronous or lagging behind that of the stress during loading, and phase of the strain lags behind that of the stress during unloading. When the stress amplitude is constant, the damping ratio tends to be stable as the number of cycles increases. And the larger the stress amplitude is, the larger the damping ratio becomes. The damping ratio of mudstone is greater than that of sandstone, and the radial damping ratio of mudstone and sandstone is greater than the axial damping ratio. In the initial stage of cyclic loading, the radial damping ratio of mudstone and sandstone increases faster. With the ratio of radial strain to axial strain becoming larger, the ratio of radial damping ratio to axial damping ratio decreases linearly.

 

Key words: rock dynamics; variable amplitude grading cyclic loading; hysteresis curve; stress-strain hysteresis relationship; radial damping ratio; axial damping ratio

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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