天然源震动成像技术在城市隐伏断裂勘察中的应用  

Application of Buried Fault Survey Technology Based on Generalized Microtremor Imaging

作　　者：牛永效 王官超 祁晓雨 马传广 秦海旭 NIU Yongxiao;WANG Guanchao;QI Xiaoyu;MA Chuanguang;QIN Haixu(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道勘察》2023年第6期46-49,55,共5页Railway Investigation and Surveying

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(L2022G012)。

摘　　要：在城市隐伏断裂勘察中,存在建筑物密集、高压线电磁影响及车辆震动等干扰因素,传统大地电磁、地震类物探方法实施困难。故研发了一种天然源震动成像勘察新技术,对其特征频率提取、成像方法,建立滤波、道均衡、特征频率提取、成像、高程校正等数据处理流程进行研究,并结合某新建高铁项目典型工点进行工程化应用。结果表明,天然源震动成像技术以自然界震动信号为震源,无需人工震源,受高压线及车辆震动等人为干扰因素的影响小;无需不同道之间的交互处理,现场布置灵活,受地形和地质条件的影响小,频带宽,对150 m深度范围内的城市隐伏断裂具有较高的勘探精度。It is difficult to implement traditional drilling,magnetotelluric and seismic geophysical exploration methods of buried fault in an urban area,which is populated with buildings,high voltage lines,vehicle vibration and other human interference factors.Aiming at the problem,a microtremor imaging method was developed based on theoretical foundation of generalized microtremor,in which the characteristic frequency extraction and imaging strategy were researched.Data processing was established,which involved filter,channel equalization,characteristic frequency extraction,imaging and elevation correction.The microtremor imaging method was applied in typical site of railway project being constructed,the detecting results were consistent with the field investigations by contrasting with regional survey.The results indicate that,the natural-source vibration imaging technology employs naturally occurring seismic signals as a seismic source,eliminating the need for artificial sources.It is less affected by anthropogenic factors like high-voltage power lines and vehicular vibrations.It doesn’t necessitate mutual processing between different channels,offering flexible field deployment.It is minimally influenced by terrain and geological conditions,covering a broad frequency range.It demonstrates higher accuracy in exploring concealed urban faults within a depth range of 150 meters.

关 键 词：高速铁路 天然源震动 隐伏断裂 特征频率 成像 

分 类 号：U238[交通运输工程—道路与铁道工程] P315.3[天文地球—地震学] P237[天文地球—固体地球物理学]