基于多重散射波波速变化的滑坡实时监测方法与应用研究  

A new rock mass wave velocity monitoring method of slopes based on multiple scattering waves and its field application

作　　者：谢凡[1] 夏开文[2,3] 黄会宝 戴仕贵[5] 王宝善[6] 位伟 XIE Fan;XIA Kaiwen;HUANG Huibao;DAI Shigui;WANG Baoshan;WEI Wei(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;Guodian Dadu River Hydropower Co.,Ltd.,Chengdu,Sichuan 610000,China;Sichuan Earthquake Administration,Chengdu,Sichuan 610016,China;School of Earth and Space Science,University of Science and Technology of China,Hefei,Anhui 230026,China;Geotechnical and Structural Engineering Safety in Hubei Province,Wuhan University,Wuhan,Hubei 430072,China;School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]天津大学水利工程仿真与安全重点实验室,天津300072 [3]天津大学建筑工程学院,天津300072 [4]国电大渡河流域水电开发有限公司,四川成都610000 [5]四川省地震局,四川成都610016 [6]中国科学技术大学地球与空间科学学院,安徽合肥230026 [7]武汉大学岩土与结构工程安全湖北省重点实验室,湖北武汉430072 [8]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《岩石力学与工程学报》2020年第11期2274-2282,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：中央级公益性科研院所基本科研业务费专项(DQJB19B24);国家重点研发计划项目(2018YFC1503302);天津市自然科学基金项目(19JCZDJC40400)。

摘　　要：基于地震学领域的背景噪声和声学领域的多重散射波理论,提出一种实时监测岩质边坡内部岩体波速变化的新方法。该方法通过在地表设置的地震仪,测量背景噪声产生的震动信号。通过多重散射波的相关分析,可以得到滑坡内部包含滑移面的岩体相对波速变化。利用该方法在滑坡灾害频发的四川省汉源县瀑布沟水电站库首右岸的变形体边坡上开展野外监测试验,发现边坡内部岩体波速随季节而变化,并受到附近地震和降雨等因素的影响。具体说来波速随着季节温度的升高而增加,地震会造成波速的减小但是会在短时间内恢复,降雨则会导致波速的持续下降。观察到在边坡局部小规模滑坡前约7 d,波速出现了显著的异常下降并停留在一个最小值上。Based on the recent advance of ambient noise in seismology and diffusing wave in acoustics,a novel method for monitoring the wave velocity change of rock mass inside slopes using diffusing wave induced by ambient noise is proposed,by which the ground surface vibration caused by ambient noise is monitored using seismometers. The real time wave velocity change of the underground rock mass can be obtained through the correlation of the diffusing wave. This method was applied to monitor the rock slope at the right band of the reservoir of the Pubugou Power Station in Sichuan Province. The results show that the rock mass wave velocity varies with the season and is affected by the nearby earthquake and precipitation. Specifically,the rock mass wave velocity increases with the temperature,decreases temporarily due to the earthquake and decreases continuously with the precipitation. Around 7 days prior to a local small landslide,abnormal wave velocity decrease was observed,and the velocity stayed at a minimum value till the catastrophic failure.

关 键 词：边坡工程 岩质边坡 滑坡预警 背景噪声 多重散射波 岩体波速 

分 类 号：P642[天文地球—工程地质学]