首页|基于声发射频谱的次生胶结岩体加卸载损伤特性

基于声发射频谱的次生胶结岩体加卸载损伤特性

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斜坡岩体裂隙中广泛存在后期次生胶结物，地震过程中次生胶结岩体极易发育密集微裂纹。开展单轴静荷载和加卸载试验，通过声发射频谱演化特征研究荷载条件下次生胶结物对岩体微裂纹扩展过程的影响。研究结果表明:静荷载下小尺度裂纹、微小裂纹、沿晶裂纹和穿晶裂纹贯穿整个试验过程，低频高频信号对应的大尺度裂纹主要产生在不稳定扩展阶段，加卸载条件下声发射主频演化类型受到次生胶结物面积的影响，次生胶结物对岩体损伤起主要控制作用，降低了造成岩体损伤的应力阈值，加卸载作用下次生胶结物与岩石性质差异造成的非协调变形是造成损伤的根本原因。
Characteristics of fatigue damage in secondary cemented rock mass based on acoustic emission spectrum
Secondary cementation is widely distributed in the cracks of the slope rock mass,and the secondary cemented rock mass is very easy to develop dense microcracks during the seismic process.Uniaxial static loading and unloading tests were carried out to study the effect of secondary cementation on the microcrack propagation process of the rock mass under the loading conditions by means of the acoustic emission(AE)spectrum characterization.The results show that small-scale cracks,microcracks,along-crystalline cracks and through-crystalline cracks are generated throughout the whole test process under static loading.Large-scale cracks corresponding to low-frequency and high-frequency signals are mainly generated in the unstable propagation stage.The type of AE peak frequency under loading and unloading conditions is influenced by the area of secondary cementation,which plays a major role in controlling the damage to the rock mass and reduces the stress threshold that cause damage.The non-compatible deformation caused by the difference between secondary cementation and rock properties under loading and unloading is the root cause of the damage.

secondary cemented rock massloading and unloadingacoustic emission spectrumprogressive damage

朱凌、崔圣华、裴向军、孙平贺、梁玉飞、孙梦宇

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中南大学地球科学与信息物理学院,湖南长沙,410083

滑坡灾害风险预警与防控应急管理部重点实验室(成都理工大学),四川成都,610059

地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都,610059

次生胶结岩体 加卸载 声发射频谱 渐进损伤

国家自然科学基金资助项目滑坡灾害风险预警与防控应急管理部重点实验室开放基金资助项目National Natural Science Foundation of ChinaOpen Fund for Key Laboratory of Landslide Risk Earlywarning and Control,Ministry of Emergency Management

42307249KLLREC2023K001

2024

10.11817/j.issn.1672-7207.2024.07.027

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(7)