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引用本文:李华,王亮,韩浩东,杨剑,王桥,王东辉,席振铢,龙霞,张伟,廖国忠. 红层地区城市地下空间膏盐富集层探测新方法——以成都市国际生物城为例[J]. 中国地质, 2020, 47(6): 1793-1803.
LI Hua,WANG Liang,HAN Haodong,YANG Jian,WANG Qiao,WANG Donghui,XI Zhenzhu,LONG Xia,ZHANG Wei,LIAO Guozhong. A new method for detecting gypsum mineral salt enriched layer of urban underground space in red bed area: A case study of Chengdu International Biological City[J]. Geology in China, 2020, 47(6): 1793-1803(in Chinese with English abstract).
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红层地区城市地下空间膏盐富集层探测新方法——以成都市国际生物城为例
李华1, 王亮2, 韩浩东1, 杨剑1, 王桥1, 王东辉1, 席振铢3, 龙霞2, 张伟1, 廖国忠1
1.中国地质调查局成都地质调查中心, 四川 成都 610081;2.湖南五维地质科技有限公司, 湖南 长沙 410205;3.中南大学地球科学与信息物理学院, 湖南 长沙 410083
摘要:
含膏盐岩体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富集地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。本文以成都市天府新区国际生物城为研究区,选择了一种快速、无损、抗干扰能力强的全新瞬变电磁法——等值反磁通瞬变电磁法(OCTEM),对白垩系灌口组红层内膏盐富集层进行探测研究。首先根据研究区内不同地层的电阻率特征,建立了三层、四层、五层3种地电模型,分别进行OCTEM正演响应分析,结果表明该方法能够有效地识别出与围岩电阻率差异明显的膏盐富集层;然后对2 km2的试验区开展了网度为100 m×10 m的实测扫面工作,通过反演计算建立了研究区200 m以浅的三维电性结构,结合钻孔结果综合验证与分析,成功推断出膏盐富集层的空间展布形态,证明了该方法对红层地区城市地下空间膏盐富集层探测的有效性。
关键词:  红层  膏盐富集层  等值反磁通瞬变电磁法  正演  地下空间  城市地质调查工程  成都市  四川省
DOI:10.12029/gc20200615
分类号:TU91
基金项目:中国地质调查局项目(DD20189210、DD20190033)和国家自然科学青年基金(41804144)联合资助。
A new method for detecting gypsum mineral salt enriched layer of urban underground space in red bed area: A case study of Chengdu International Biological City
LI Hua1, WANG Liang2, HAN Haodong1, YANG Jian1, WANG Qiao1, WANG Donghui1, XI Zhenzhu3, LONG Xia2, ZHANG Wei1, LIAO Guozhong1
1.Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China;2.Hunan 5D Geophyson Co., Ltd., Changsha 410205, Hunan, China;3.School of Geosciences and Info-physics, Central South University, Changsha 410083, Hunan, China
Abstract:
Gypsum mineral salt enriched layers are common bad geological body in the process of utilizing urban underground space in the red beds area. The detection of the burial depth and spatial distribution of gypsum-salt enriched strata in advance is of great significance for the development of urban underground space resources, the determination of foundation bearing capacity, bearing stratum and foundation type selection. Taking the International Biological City of Tianfu New District of Chengdu as the experimental area, the authors chose a fast, non-destructive and anti-jamming new transient electromagnetic method, opposing coils transient electromagnetic method (OCTEM), to detect and study the gypsum-salt enriched layer in red mudstone of Cretaceous Guankou Formation. Firstly, according to the resistivity characteristics of different strata in the study area, the authors established geoelectric models such as three-layer model, four-layer model and five-layer model, and carried out OCTEM forward response analysis for these models, respectively. The forwarding calculation shows that, with OCTEM method, the gypsum salt enriched layer can be effectively identified from surrounding rocks with obvious resistivity difference. Then, the authors took the practical measurement in the test area covered about two square kilometers, and swept the field with a network of 100m×10 m. Finally, the authors obtained the inversion results and established the three-dimensional electrical structure of strata in the depth greater than 200 m in the study area. With the comprehensive verification and analysis of drilling results, the spatial distribution pattern of gypsum mineral salt enriched layer was successfully inferred, which proves that this method is effective for the detection of gypsum-salt enrichment layer in urban underground space of the red bed area.
Key words:  red bed  gypsum mineral salt enriched layer  opposing coils transient electromagnetic method (OCTEM)  forward modeling  underground space  urban geological survey engineering  Chengdu  Sichuan Province