不均匀风化花岗岩地层模型被动源地震模拟  

Passive Seismic Modeling on Uneven Weathered Granite Model

作　　者：高启 朱伟[1] 郝龙 邓小虎 许可 杨俊杰 GAO Qi;ZHU Wei;HAO Long;DENG Xiaohu;XU Ke;YANG Junjie(Yangtze University,College of Geophysics and Petroleum Resources,Wuhan 430100,China;Terramagis Energy Technology Co.,Ltd.,Wuhan 430074,China;Wuhan Institute of Earthquake Engineering Co.,Ltd.,Wuhan 430071,China)

机构地区：[1]长江大学地球物理与石油资源学院,湖北武汉430100 [2]武汉拓盟能源科技有限公司,湖北武汉430074 [3]武汉地震工程研究院有限公司,湖北武汉430071

出　　处：《河南科技》2023年第20期99-103,共5页Henan Science and Technology

摘　　要：【目的】花岗岩体在我国东南山地丘陵地区经常出露。风化花岗岩的性质变化较大,严重影响隧道、桥梁和边坡等道路工程建设,需要对花岗岩体进行物探勘察与评价。【方法】本研究根据野外花岗岩体物探勘察和开挖情况,建立不均匀风化花岗岩地质模型,设计随机震源,进行被动源地震记录模拟。【结果】模拟结果表明,大量随机震源激发的地震波,在不同花岗岩地层中具有明显不同的传播特征;不同地质模型的被动源地震记录具有明显差异。【结论】被动源地震记录能够反映花岗岩地层性质的变化,为利用正演进一步研究野外观测装置和反演参数奠定了基础。[Purposes]Granite bodiesareoftenexposed in the mountainous hilly area of southeast China.Property of weathered granite changes greatly,which seriously affects the constructions of road projects such as tunnels,bridge and side slope.Geophysical exploration and evaluation of granite is of great significance.[Methods]According to the field granite body physical exploration survey and excavation,This paper establishes a geological model of unevenly weathered granite,designs a random seismic source,and conducts a passive source seismic recording simulation.[Findings]The simulation results show that the seismic waves arisen by a large number of random sources have obviously different propagation characteristics in different granite strata;the passive source seismic records of different geological models have obvious differences.[Conclusions]This study indicates that the passive seismic records can reflect the variation of granite property,which lays a foundation for further study of field observation system and inversion parameters by using forward modeling.

关 键 词：被动源 弹性波正演 风化花岗岩 

分 类 号：P631[天文地球—地质矿产勘探]