摘要
针对传统变形监测技术不适用于突发性强、失稳前夕变形小的危岩崩塌监测与预警问题,依托某高速公路采石场边坡,开展了危岩崩塌过程微震监测现场试验。试验结果表明:根据微震信号演化特征,将危岩崩塌孕育过程分为“缓慢启裂、加速开裂、贯通崩塌”三个阶段,不同阶段的微震信号活跃度、主频、幅值、张拉剪切型信号占比等特征具有显著差异;危岩崩塌前夕,微震信号具有低频与高幅值信号数量增大、b值连续下降、信号活跃度短时激增、剪切型信号比例显著增加等特征,为基于微震信号的危岩崩塌预警标准建立提供了科学依据。
Due to the limitations of the traditional deformation monitoring technique in addressing the challenges of sudden and minor pre-failure deformations in dangerous rock collapse monitoring and early warning,the field microseismic monitoring tests for the dangerous rock collapse process are conducted at a quarry slope of certain expressway.The test results show that based on the evolutionary characteristics of microseismic signals,the gestation process of a dangerous rock collapse can be divided into three stages:"the slow initiation of cracks,the accelerated cracking,and the thorough collapse".The significant differences are observed in the activity level,dominant frequency,amplitude,and proportion of tensionshear type signals of microseismic signals at different stages.Before a dangerous rock collapse occurs,the microseismic signals exhibit the characteristics such as an increase in the number of low-frequency and highamplitude signals,a continuous decrease in the b-value,a temporary surge in signal activity level,and a significant increase in the proportion of shear-type signals.These evolutionary characteristics provide the scientific support for the establishment of early warning standards for dangerous rock collapse based on microseismic signals.
作者
苏国韶
黄吕
牛文静
许华杰
黄京华
Su Guoshao;Huang Lyu;Niu Wenjing;Xu Huajie;Huang Jinghua(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;School of Computer,Electronics and Information,Guangxi University,Nanning 530004,China)
出处
《工程勘察》
2026年第2期9-15,30,共8页
Geotechnical Investigation & Surveying
基金
国家自然科学基金项目(52169021).
关键词
危岩
崩塌
监测
微震
dangerous rock
collapse
monitoring
microseism
