基于岩石声学研究冻融环境下贺兰山岩画载体的破裂特征  

Fracture characteristics of the rock painting carrier in the Helan Mountain under freezing-thawing environment based on acoustic emission

作　　者：杨有贞 冯海燕[1] 谌文武 高翔[4] 赵诣深 金梦华 林青青 马文国 YANG You-zhen;FENG Hai-yan;CHEN Wen-wu;GAO Xiang;ZHAO Yi-shen;JIN Meng-hua;LIN Qing-qing;MA Wen-guo(School of Physics and Electronic-Electrical Engineering,Ningxia University,Yinchuan 750021,China;Institute of Solid Mechanics,Ningxia University,Yinchuan 750021,China;College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;Zaoquan Coal Mine,National Energy Investment Group Co.,Ltd.,Yingchuan 753000,China)

机构地区：[1]宁夏大学物理与电子电气工程学院,银川750021 [2]宁夏大学固体力学研究所,银川750021 [3]兰州大学土木工程与力学学院,兰州730000 [4]国家能源投资集团有限责任公司,宁夏煤业有限责任公司枣泉煤矿,银川753000

出　　处：《兰州大学学报（自然科学版）》2022年第5期616-622,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：宁夏回族自治区自然科学基金项目(022204050013);国家自然科学基金项目(11662015,51768059)。

摘　　要：针对目前贺兰山岩画载体日益严重的破裂问题,考虑温度-水环境,开展岩画载体的冻融循环实验,引入声发射技术,结合力学实验和电子显微镜照片,分别通过岩石力学物理性质、声发射信号分布及微观形貌演化规律揭示贺兰山岩画载体的破裂特征.结果表明,岩石的质量随冻融次数的增加持续下降,强度随冻融次数的增加呈指数下降趋势,冻融岩石破坏损失时域内具有连续演进的特点,经历了初始增长阶段、稳定增长阶段和陡增阶段,对应声发射定位点的增多,宏观表现为轴向破裂转化为混合破坏,破裂面由单一破裂面转化为多破裂面;微观演化路径为紧密黏结-微裂纹开始发育-微裂纹大量发育-贯通断裂裂纹-结构疏松.In view of the increasingly serious rupture problem of the rock art carrier in the Helan Mountain, the freeze-thaw cycles test was carried out in consideration of the temperature and water environment, and the acoustic emission(AE) technology was introduced combined with the mechanical test and scanning electron microscope test. The rock mechanical properties, AE signal distribution together with microscopic morphological evolution revealed the fracture characteristics of the rock painting carrier. The results showed that rock stress exhibited an exponential decline with the increasing of the number of freeze-thaw cycles, and the rock damage had a continuous evolution in the time domain. It had experi-enced three stages, i.e. initial growth, steady growth and steep growth, corresponding to the increasing of the AE positioning point gradually. The axial collapse was transformed into a mixed failure, and the fracture surface was transformed from a single fracture surface to multiple fracture surfaces. The morphological evolution had experienced a close bonding: the beginning of microcrack development-a large number of microcracks development-through fracture crack-loose structure.

关 键 词：贺兰山岩画 冻融 声发射 三维定位 微观形貌 

分 类 号：K879.4[历史地理—考古学及博物馆学]