盾构机数据采集系统的变差分系数波场模拟研究  

Wavefield simulation in advanced geological prediction based on data acquisition system of shield machine

作　　者：王伟[1] 翟法智 高星[1] 尤加春 WANG Wei;ZHAI FaZhi;GAO Xing;YOU JiaChun(Institute of Geographic Sciences and Natural Resources Research,CAS,State Key Laboratory of Resource and Environmental Information Systems,Beijing 100101,China;Zhejiang Geophysics Technology Application Research Institute Co.,Ltd.,Hangzhou 310005,China;Chengdu University of Technology,School of Geophysics,Chengdu 610059,China)

机构地区：[1]中国科学院地理科学与资源研究所,资源与环境信息系统国家重点实验室,北京100101 [2]浙江省地球物理技术应用研究所有限公司,杭州310005 [3]成都理工大学地球物理学院,成都610059

出　　处：《地球物理学进展》2023年第6期2734-2746,共13页Progress in Geophysics

基　　金：中国科学院仪器研制项目(YJKYYQ20170033);国家自然科学基金资助项目“基于槽波的小尺度煤田陷落柱精细探测研究”(41641040)联合资助。

摘　　要：超前地质预报是隧道施工过程中必不可少的一项工作.在隧道开挖过程中,了解隧道掘进面之前的地质情况对保证施工安全和调整施工工艺等具有重要意义.本文结合城市地下空间开发中地铁建设中盾构机施工工艺的特点,提出采用环形地质超前预报的地震反射波数据采集方法.为了进一步分析该采集系统的数据特点,本文提出利用三维声波方程的变差分系数有限差分方法分析了垂直断面构造和复杂断面构造中波场的传播规律.得益于变差分系数有限差分方法的应用,在复杂波场模拟中能更好地压制波场频散,提高计算精度.本文发现由于激发点位置的不同,设计环形接收方式采集的地震反射波对简单的垂直断面构造的响应也存在一定差异.对复杂断面构造,与经典双曲线走时曲线相比,采用环形接收方法记录的倾斜断面的走时有其自身特点.本文对盾构机环形采集方法的波场传播规律进行了研究,研究结果实际生产中的速度反演和波形分析具有指导意义.Advance geological prediction is an essential work in the process of tunnel construction.In the process of tunnel excavation,it is of great significance to understand the geological conditions to ensure the construction safety and adjust the construction technology.In this paper,combined with the characteristics of shield machine construction technology in subway construction and urban underground space investigation,the seismic reflection data acquisition method using a ring type for advanced geological prediction is proposed.In order to further analyze the data characteristics of the acquisition system,the finite difference method with variable difference coefficients by using three-dimensional acoustic equation is proposed to analyze the propagation of wavefield in a vertical fault structure and a complex fault structure.Because of the application of variable difference coefficient finite difference method,it can better suppress the wavefield dispersion and improve the calculation accuracy in complex models.In this paper,we found that the responses of seismic reflection wave in the simple vertical fault structure show different features due to the different positions of excitation points.Compared with the classical hyperbolic travel time curves,the travel time of the inclined fault structure recorded by the ring receiving method has its own special characteristics.Based on the research of this paper,the propagation law of the wavefield using the circular acquisition method of shield machine is studied,which has guiding significance for the velocity inversion and waveform analysis in the actual production.

关 键 词：盾构机 波场模拟 变差分系数 复杂断面构造 

分 类 号：P631[天文地球—地质矿产勘探]