2023 Vol. 50, No. 6
Article Contents

LI Hua, WANG Donghui, ZHANG Wei, YANG Jian, WANG Qiao, LIAO Guozhong, WANG Chunshan, HAN Haodong, XI Zhenzhu, WANG Liang, LIU Sheng, XIA Yougang, LI Ying, YANG Tao. 2023. The application effect of geophysical method in fine exploration of urban geological structure and study of optimal combination method: A case study of Tianfu New Area in Chengdu, Sichuan Province[J]. Geology in China, 50(6): 1691-1704. doi: 10.12029/gc20200509003
Citation: LI Hua, WANG Donghui, ZHANG Wei, YANG Jian, WANG Qiao, LIAO Guozhong, WANG Chunshan, HAN Haodong, XI Zhenzhu, WANG Liang, LIU Sheng, XIA Yougang, LI Ying, YANG Tao. 2023. The application effect of geophysical method in fine exploration of urban geological structure and study of optimal combination method: A case study of Tianfu New Area in Chengdu, Sichuan Province[J]. Geology in China, 50(6): 1691-1704. doi: 10.12029/gc20200509003

The application effect of geophysical method in fine exploration of urban geological structure and study of optimal combination method: A case study of Tianfu New Area in Chengdu, Sichuan Province

    Fund Project: Supported by the projects of China Geological Survey (No.DD20189210, No.DD20190033) and National Natural Science Foundation of China (No.41804144)
More Information
  • Author Bio: LI Hua, male, born in 1979, senior engineer, mainly engaged in the application and research of geophysical exploration in engineering and environmental geology; E-mail: 23841719@qq.com
  • This paper is the result of urban geological survey engineering.

    Objective

    Tianfu New Area (TNA) of Chengdu is characterized by a typical red stratigraphy in southwest China, including interbed sedimentary rocks of mudstone, silty mudstone, argillaceous siltstone and sandstone. The difference of physical property among the above rocks is minor. Clarifying the shallow geological structure by geophysical method is favor for constructing the fine three-dimensional geological model of TNA.

    Methods

    This paper attempts to image fine geological structure in 4 typical sites of TNA through a variety of new and traditional geophysical methods.

    Results

    Ground penetrating radar (GPR) and three component frequency resonance (TCFR) have higher imaging resolution than that of shallow seismic exploration (SSE), electrical resistivity tomography (ERT), opposing coils transient electromagnetic (OCTEM) and microtremor exploration (ME). Urban noise tends to affect field data quality in SSE, TCFR and ME, but not in GPR and OCTEM. Fine geological structure from shallow to deep depth can be obtained by method assembly for GPR, TCFR, ERT, OCTEM, SSE and ME.

    Conclusions

    Under comparing and analyzing the detection depth, resolution, anti-urban noise level, construction efficiency, and economic cost of the above methods, the optimal geophysical method assembly to detect fine geological structure with different construction conditions and exploration depths in TNA of Chengdu is summarized.

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