摘要
膏盐层是红层地区城市地下空间利用过程中常见的不良地质体.提前获知基岩内膏盐层的埋深及空间展布规律,对城市地下空间资源的开发利用以及地基承载力、持力层、基础选型等参数的确定具有重要的参考意义.本文采用高密度电法、微动勘探、三分量频率谐振勘探和等值反磁通等方法在成都市天府新区国际生物城开展了膏盐富集层的探测研究,综合对比分析各种方法的探测效果、施工效率及经济成本后,认为在城市膏盐层的调查应用中,等值反磁通瞬变电磁法是一种相对经济、可行、有效的方法;选择该方法对2 km^2的研究区开展了100 m×10 m的扫面测量工作,通过反演计算建立了研究区200 m以浅的三维电性结构,结合钻孔信息成功推断出膏盐层的空间展布形态,证明了该方法对红层地区城市地下空间膏盐层的探测的有效性.
Gypsum mineral salt enriched layers are common bad geological body in the process of utilizing urban underground space in red beds area.It’s of great significance for the development of urban underground space resources,the determination of foundation bearing capacity,bearing stratum and foundation type selection to know the burial depth and spatial distribution of gypsum-salt enriched strata in advance.In this paper,high-density resistivity method,microtremor survey,three-component frequency resonance exploration and Opossing Coils Transient Electromagnetic Method(OCTEM)are used to detect gypsum mineral salt enriched layer in Tianfu International Biological City,Chengdu.After analyzing the detection effect,construction efficiency and economic cost of various methods,it is considered that the OCTEM is a relatively economical,feasible and effective method in the investigation of gypsum mineral salt enriched layer in city.A 100 m×10 m sweep survey has been carried out in the study area of 2 km^2 by using OCTEM,and the sweep survey has been established by inversion calculation.Based on the shallow three-dimensional electrical structure of 200 m in the study area and borehole information,the spatial distribution pattern of gypsum mineral salt enriched layer is successfully inferred,which proves the validity of this method in detecting gypsum mineral salt enriched layer in urban underground space of red bed area.
作者
李华
杨剑
王桥
王东辉
席振铢
王亮
韩浩东
张伟
廖国忠
龙霞
LI Hua;YANG Jian;WANG Qiao;WANG Dong-hui;XI Zhen-zhu;WANG Liang;HANG Hao-dong;ZHANG Wei;LIAO Guo-zhong;LONG Xia(Chengdu Center of China Geological Survey,Chengdu 610081,China;Hunan 5D Geophyson Company Limited,Changsha 410205,China;School of Geosciences and Info-physics,Central South University,Changsha 410083,China)
出处
《地球物理学进展》
CSCD
北大核心
2020年第4期1577-1583,共7页
Progress in Geophysics
基金
中国地质调查局项目(DD20189210、DD20190033)
国家自然科学青年基金(41804144)联合资助。
关键词
红层
膏盐富集层
高密度电法
微动
三分量频率谐振
等值反磁通瞬变电磁法
城市地下空间
Red bed
Gypsum mineral salt enriched layer
High density resistivity method
Microtremor survey
Three-component frequency resonance
Opossing Coils Transient Electromagnetic Method(OCTEM)
Urban underground space
