| 电磁法在工程地质勘察中的应用 |
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| 引用本文： | 李文录.电磁法在工程地质勘察中的应用[J].华南地震,1992,12(2):48-54. |
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| 作者姓名： | 李文录 |
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| 作者单位： | 广东省地震局 广州 |
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| 基金项目： | 地震科学联合基金资助课题,90013 |
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| 摘 要： | 本文采用有场源电磁法勘探粤东沿海广(州)深(圳)珠(海)及深(圳)汕(头)南线等高速公路工程,勘探使用美国GDP—12及加拿大EM—37电磁数据采集系统。文章论述了时间域与频率域的多种电磁法装置在桥梁、互通、遂道及软土公路工程中的地磁物理应用前提及它们的应用环境、工作效率、勘探深度等,低阻覆盖下的地质分层及断层产状性质等问题是本文探讨要点。文中例举了多种装置的电磁异常场剖面图及其曲线形态:对磨刀门桥址西江断裂的电磁异常剖面曲线形态、特征作了构造地质解释,认为该断裂系由两条主干断层组成的蠕滑断层组。上述工程地质解释结论已作为工程勘察设计依据。有的电磁异常已被工程地震及钻探证实。
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| 关 键 词： | 电磁法 勘探 高速公路 断裂 |
APPLICATION OF ELECTROMAGNETIC METHOD TO THE PROSPECTION IN ENGINEERING GEOLOGY |
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| Li Wenlu.APPLICATION OF ELECTROMAGNETIC METHOD TO THE PROSPECTION IN ENGINEERING GEOLOGY[J].South China Journal of Seismology,1992,12(2):48-54. |
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| Authors: | Li Wenlu |
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| Institution: | Seismological Bureau of Guangdong Province |
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| Abstract: | In thispaper, the projects of expressways, such as Guang-Shen-Zhu and Guang-Shan expressways along the east coast in Guangdong province, are explored by the controlled source magnetotelluric method. And the electromagnetic data acquisition systems of GDP12 (U.S.A) and EM-37 (Canada) are used during the exploration. This paper also discusses the application of electromagnetic setups about time domain and frequency domain in engineering geophysics of bridges, cross roads, tunnels and soft earth expressways and their applied environment, working efficiency, exploration depth and so on. Some problems about geological layer distinction and the characters of faults occurrence in the lower resistivity cover are the main points to be discussed in this paper. Some pseudosections and anomalistic curves in the electromagnetic field are illustrated. The shapes and characters of amomalislilc curves at the electromagnetic field of Modaomen bridge site where is located at Xijiang fault are also explained by tectonic geology. The designs of above-mentioned engineering explorations are based on the interpreted conclusions of the engineering geology. Some of the electrommagnetic anormalies have been checked and proved by engineering seismic exploration and drill holes. |
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| Keywords: | Electromagnetic prospecting The east coast in Guangdong Province Expressway Xijiang fault |
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