城市地表建筑物密集区的微动探测方法——以成都市某海鲜批发市场的浅表精细探测为例  

Microtremor Exploration for Dense Area of Urban Surface Buildings:A Case Study of Shallow Fine Detection in One Seafood Wholesale Market in Chengdu City

作　　者：张陈 张伟[2] 易永杰 姚世民 何全华 ZHANG Chen;ZHANG Wei;YI Yong-jie;YAO Shi-min;HE Quan-hua(School of Geophysics, Chengdu University of Technology, Chengdu 610059, China;Chengdu Center of China Geological Survey, Chengdu 610082, China;Sichuan Metallurgical 605 Engineering Geophysical Detection Co., Ltd., Chengdu 610082, China)

机构地区：[1]成都理工大学地球物理学院,成都610059 [2]中国地质调查局成都地质调查中心,成都610082 [3]四川省川冶陆零伍工程物探检测有限公司,成都610082

出　　处：《科学技术与工程》2022年第19期8200-8209,共10页Science Technology and Engineering

基　　金：国家自然科学基金(41804144);中国地质调查局项目(DD20160082)。

摘　　要：城市建成区普遍存在场地限制、地面硬化、复杂干扰等难题,因此对城市物探方法的场地适应性、抗干扰能力、探测分辨率等提出了较高要求。以成都市某海鲜批发市场的浅表精细探测工作为例,在地表密集建筑物间的狭小空间灵活布置短极距“T”“L”形组合观测台阵,通过扩展空间自相关(extended spatial auto correlation,ESPAC)算法获得了高质量的50~10 Hz频段面波频散数据,反演获得的横波速度剖面达到了地下浅表2~40 m埋深地质体的精细分层要求,有效支撑了成都市某地铁轨道的建设工作。综合研究结果及钻孔资料表明,“灵巧小台阵”及ESPAC算法可替代以往探测浅表地层时需要额外补充部署主动源工作补齐高频信号的工作模式,在大大节省施工成本的同时,也避开了以往重锤敲击所造成的噪声、震动等扰民干扰,在城市地球物理勘查领域具有一定的可推广应用价值。There are many problems in urban built-up areas,such as site limitation,ground hardening,complex interference,etc.Therefore,higher requirements are put forward for the site adaptability,anti-interference ability and detection resolution of urban geophysical prospecting methods.The shallow fine detection work of a seafood wholesale market in Chengdu was taken as an example.The short polar distance“T”/“L”-type composited observation array was flexibly arranged in the narrow space between dense buildings on the surface.High quality surface wave dispersion data of 50~10 Hz frequency band were obtained through extended spatial auto correlation(ESPAC)algorithm,the S-wave velocity profile obtained by inversion meets the requirements of fine stratification of 2~40 m buried depth,which effectively supports the construction of a subway track in Chengdu.The comprehensive research results and drilling data show that the“smart small array”and ESPAC algorithm can replace the previous working mode that requires additional active sources to supplement the high-frequency signals when detecting the shallow strata.It can not only save the construction cost,but also avoid the noise,vibration and other disturbance caused by heavy hammer.It has certain application value in the field of urban geophysical exploration.

关 键 词：城市建成区 密集建筑群 复杂的背景场 微动勘探 浅层精细分层 

分 类 号：P631[天文地球—地质矿产勘探]