滑坡面瑞雷波波场模拟及H/V谱比探测  

Rayleigh Wave Field Simulation and H/V Spectral Ratio Detection on Landslide Surface

作　　者：王芃 邵广周[1] 恒翔天 蓝笛瑄 王国顺 霍科宇 Wang Peng;Shao Guangzhou;Heng Xiangtian;Lan Dixuan;Wang Guoshun;Huo Keyu(School of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710054

出　　处：《吉林大学学报（地球科学版）》2024年第3期1031-1041,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家重点研发计划项目(2021YFA0716902);国家自然科学基金项目(42174176,41874123)。

摘　　要：滑坡是一种分布广泛、数量众多、危害巨大的地质灾害,准确确定滑坡滑动面对滑坡防治具有重大意义。传统的勘探手段,如钻探和地球物理方法在起伏较大的滑坡地形中具有诸多限制。本文以四川省屏山县东池庄滑坡为参考,建立了起伏地形软弱性土质滑坡模型,进行了瑞雷波波场模拟并经过模式分离后计算求得水平/垂直(H/V)谱比曲线。对比分析了波场传播及H/V谱比曲线的特征,发现在110道检波器排列中,中心部位检波器的峰值频率可作为计算土石分界面的卓越频率。设计了土层厚度分别为25、31、35 m的滑坡模型,发现土层厚度与峰值频率呈负相关关系。给出了地层为黏性土与泥岩时的频率-深度经验公式,得到了连续滑动面信息,经验公式计算结果与实际模型吻合较好。Landslide is a kind of geological hazard with wide distribution,large quantity and great harm.It is of great significance to determine the landslide sliding face accurately.Traditional exploration methods such as drilling and geophysical methods have many limitations in the undulating landslide terrain.Based on Dongchizhuang landslide in Pingshan County,Shandong Province,a soft soil landslide model with undulating terrain is established.Rayleigh wave field simulation is carried out and the horizontal/vertical(H/V)spectral ratio curve is calculated after model separation.The characteristics of wave field propagation and H/V spectral ratio curve are compared and analyzed.It is found that the peak frequency of the geophone in the center can be used as the superior frequency for calculating the earth-rock interface in the 110-channel geophone arrangement.Landslide models with soil thickness of 25,31 and 35 m are designed,and it is found that there is a negative correlation between soil thickness and peak frequency.The frequency-depth empirical formula is given when the stratum is clay and mudstone,and the information of continuous sliding surface is obtained.The results of the empirical formula agree well with the actual model.

关 键 词：软弱性滑坡 H/V谱比曲线 波场模拟 峰值频率 

分 类 号：P631.4[天文地球—地质矿产勘探]