(1. Institute of Geophysics，China Earthquake Administration，Beijing 100081，China；2. State Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300072，China；3. School of Civil Engineering，Tianjin University，Tianjin 300072，China；4. Guodian Dadu River Hydropower Co.，Ltd.，Chengdu，Sichuan 610000，China；5. Sichuan Earthquake Administration，Chengdu，Sichuan 610016，China；6. School of Earth and Space Science，University of Science and Technology of China，Hefei，Anhui 230026，China；7. Geotechnical and Structural Engineering Safety in Hubei Province，Wuhan University，Wuhan，Hubei 430072，China；8. School of Civil Engineering，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：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.
谢 凡1，夏开文2，3，黄会宝4，戴仕贵5，王宝善6，位 伟7，8. 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[J]. 岩石力学与工程学报, 2020, 39(11): 2274-2282.
XIE Fan1，XIA Kaiwen2，3，HUANG Huibao4，DAI Shigui5，WANG Baoshan6，WEI Wei7，8. A new rock mass wave velocity monitoring method of slopes based on multiple scattering waves and its field application. , 2020, 39(11): 2274-2282.
SNIEDER R. The theory of coda wave interferometry[J]. Pure and Applied Geophysics，2006，163(2/3)：455-473.
[8]
CAMPILLO M，PAUL A. Long-range correlations in the diffuse seismic coda[J]. Science，2003，299：547-549.
[4]
许 强. 对滑坡监测预警相关问题的认识与思考[J]. 工程地质学报，2020，28(2)：360-374.(XU Qiang. Understanding the landslide monitoring and early warning：consideration to pratical issues[J]. Journal of Engineering Geology，2020，28(2)：360-374.(in Chinese))
[3]
HUANG R，FAN X. The landslide story[J]. Nature Geoscience，2013，6(5)：325-326.
[20]
HILL D P，REASENBERG P A，MICHAEL A，et al. Seismicity remotely triggered by the magnitude 7.3 Landers，California，earthquake[J]. Science，1993，260：1 617-1 623.
LIN Q，WANG Y. Spatial and temporal analysis of a fatal landslide inventory in China from 1950 to 2016[J]. Landslides，2018，15(12)：2 357-2 372.
[6]
陈宇龙，内村太郎. 降雨诱发土坡失稳过程中弹性波波速演化规律的模型试验研究[J]. 岩石力学与工程学报，2019，38(10)：2 138- 2 150.(CHEN Yulong，UCHIMURA T. Model test of evaluation behaviors of the elastic wave velocity during the failure process of soil slopes due to rainfall[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(10)：2 138-2 150.(in Chinese))
[2]
黄润秋. 20世纪以来中国的大型滑坡及其发生机制[J]. 岩石力学与工程学报，2007，26(3)：433-454.(HUANG Runqiu. Large- scale landslides and their sliding mechanisms in China since the 20th century[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(3)：433-454.(in Chinese))
[7]
CHEN Y，WANG B S，YAO H J. Seismic airgun exploration of continental crust structures[J]. Science China Earth Sciences，2017，60(10)：1 739-1 751.
MAINSANT G，CHAMBON G，JONGMANS D，et al. Shear-wave-velocity drop prior to clayey mass movement in laboratory flume experiments[J]. Engineering Geology，2015，192(1)：26-32.
[9]
XIA J H，RICHARD D M，CHOON B P. Estimation of near-surface shear-wave velocity by inversion of Rayleigh waves[J]. Geophysics，1999，64(3)：691-700.
[14]
LAROSE E，HALL S. Monitoring stress related velocity variation in concrete with a 2×10−5 relative resolution using diffuse ultrasound[J]. The Journal of the Acoustical Society of America，2009，125(4)：1 853-1 856.
[16]
STEHLY L，CAMPILLO M，SHAPIRO N. A study of the seismic noise from its long-range correlation properties[J]. Journal of Geophysical Research：Solid Earth，2006，111(B10306)：1-12.
[19]
WANG Q Y，BRENGUIER F，CAMPILLO M，et al. Seasonal crustal seismic velocity changes throughout Japan[J]. Journal of Geophysical Research：Solid Earth，2017，122(10)：7 987-8 002.
[10]
MAINSANT G，LAROSE E，BRONMIMANN C，et al. Ambient seismic noise monitoring of a clay landslide：Toward failure prediction[J]. Journal of Geophysical Research：Earth Surface，2012，117(F1)：1-12.
[13]
SNIEDER R. Extracting the Green¢s function from the correlation of coda waves：A derivation based on stationary phase[J]. Physical Review E，2004，69(4)：046610.
[15]
NIU F，SILVER P G，DALEY T M，et al. Preseismic velocity changes observed from active source monitoring at the Parkfield SAFOD drill site[J]. Nature，2008，454：204-208.
[21]
MAINARDI，FRANCESCO. The fundamental solutions for the fractional diffusion-wave equation[J]. Applied Mathematics Letters，1996，9(6)：23-28.
[18]
XIE F，REN Y，ZHOU Y，et al. Monitoring local changes in granite rock under biaxial test：A spatiotemporal imaging application with diffuse waves[J]. Journal of Geophysical Research：Solid Earth，2018，123(3)：2 214-2 227.
2020, Vol. 39 
