| 赵子仪,杨少峰,邵朝阳.高应力循环加卸载下不同张开度裂隙类岩体变形损伤及能量演化[J].南华大学学报(自然科学版),2023,(2):37~44, 67.[ZHAO Ziyi,YANG Shaofeng,SHAO Zhaoyang.Deformation Damage and Energy Evolution of Rock Mass with Different Crack Width under Cyclic Loading and Unloading under High Stress[J].Journal of University of South China(Science and Technology),2023,(2):37~44, 67.] |
| 高应力循环加卸载下不同张开度裂隙类岩体变形损伤及能量演化 |
| Deformation Damage and Energy Evolution of Rock Mass with Different Crack Width under Cyclic Loading and Unloading under High Stress |
| 投稿时间：2022-12-28 |
| DOI：10.19431/j.cnki.1673-0062.2023.02.006 |
| 中文关键词: 高应力循环加卸载 张开度 滞回环 动弹性模量 绝对损伤参数 |
| 英文关键词:high stress cyclic loading and unloading fracture opening degree hysteresis loop back modulus of elasticity absolute damage parameters |
| 基金项目:国家自然科学基金资助项目(51704168);湖南省自然科学基金资助项目(2019JJ50528) |
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| 中文摘要: |
| 为研究高应力循环加卸载作用下不同张开度对裂隙类岩体应力-应变曲线特征、滞回环面积和动弹性模量变化规律以及裂隙类岩体损伤特性的影响。基于RMT-150B岩石力学试验机开展了不同张开度和裂隙倾角下裂隙类岩体高应力循环加卸载试验,获得高应力循环加卸载作用下裂隙类岩体力学性能。结果表明:高应力循环加卸载对类岩体峰值强度有“弱化”作用,“弱化”程度约为11%;以0.4 mm张开度为界限,小于0.4 mm的裂隙岩体滞回环面积随裂隙倾角增大呈先增大后减小规律,动弹性模量随裂隙倾角增大先减小后增大,大于0.4 mm时,滞回环面积和动弹性模量随裂隙倾角增大均呈递减趋势,且张开度增大,张拉裂纹萌生概率随之增加;绝对损伤参数随循环次数增加而增大,45°裂隙倾角涨幅最为显著。 |
| 英文摘要: |
| In order to study the effects of different fracture opening degrees on the stress-strain curve characteristics, hysteretic loop area, dynamic elastic modulus and damage characteristics of fractured rock mass under high stress cyclic loading and unloading. Based on RMT-150B rock mechanics testing machine, the high stress cyclic loading and unloading tests of fractured rock mass under different fracture opening degree and fracture dip angle were carried out, and the mechanical properties of fractured rock mass under high stress cyclic loading and unloading were obtained. The results show that high stress cyclic loading and unloading has a “weakening” effect on the peak strength of similar rock mass, and the degree of “weakening” is about 11%. Taking the fracture opening degree of 0.4 mm as the limit, the hysteretic ring area of fractured rock mass smaller than 0.4 mm increases at first and then decreases with the increase of fracture inclination angle, and the dynamic elastic modulus decreases at first and then increases with the increase of fracture inclination angle. When it is larger than 0.4 mm, the hysteretic ring area and dynamic elastic modulus decrease with the increase of fracture inclination angle, and when the fracture opening degree increases, the probability of tensile crack initiation increases. The absolute damage parameter increases with the increase of cycle times, and the increase of 45° fracture inclination angle is the most significant. |
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