刘阳,张议芳,贾东铭,郭小载,余勇,赵小龙,陈乔

• 1:重庆交通大学建筑与城市规划学院
• 2:中国科学院重庆绿色智能技术研究院
• 3:中国科学院大学重庆学院
• 4:中国石油西南油气田分公司重点地面工程建设项目部

摘要(Abstract)：

三峡库区地质灾害以发育广泛且危害性巨大的岩质滑坡为主，而导致岩质滑坡的重要原因是岩石剪切型破坏。为了探讨岩质边坡失稳破坏过程中次声波产生的机理，对三峡库区嘉陵江沿岸砂岩、泥岩、灰岩等常见岩石采样，进行岩石剪切破坏过程次声同步监测试验。通过声力学数据预处理，得到次声卓越频率、次声能量、次声事件数等次声特征，系统分析不同条件下岩石剪切破坏过程中次声波响应特征。结果表明：(1)次声预警时间点比声力学提前59～165s,比岩石彻底破坏提前78～229s,将归一化能量累计系数>0.6且归一化次声事件率>0.89时，作为岩石破裂预警点的标志。(2)明确了不同试验条件下岩石剪切破坏过程中的次声波信号响应特征，即，在剪切破坏时，砂岩和灰岩等抗剪强度更高的岩石所产生次声卓越频率和次声能量相较泥岩更大，次声事件数更少；随着岩石尺寸的逐渐增大，次声卓越频率逐渐下降；随着岩石水饱和度越高，次声卓越频率、次声事件数和次声能量均呈降低趋势；随着试验轴压增大，次声卓越频率和次声事件数呈线性增大趋势。(3)次声事件数是不同试验条件下关联度最高的次声关键特征敏感因子。研究成果对进一步利用次声开展岩质滑坡的监测和稳定性评价具有重要的理论参考价值。

关键词(KeyWords)： 滑坡灾害;监测预警;岩石剪切破坏;次声波特征;损伤理论

Abstract:

Keywords:

基金项目(Foundation): 中国科学院西部学者A类项目(E2296201);; 重庆市自然科学基金项目(cstc2021jcyj-msxmX0187);; 三峡库区消落区(重庆段)生态环境调查及生态恢复技术示范项目(5000002021BF40001);; 西藏自治区日喀则市科技计划项目(RKZ2020KJ01)

作者(Author): 刘阳,张议芳,贾东铭,郭小载,余勇,赵小龙,陈乔

DOI: 10.13928/j.cnki.wrahe.2022.11.016

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