深圳地铁复杂岩溶段地质勘察中的跨孔计算机断层扫描法研究
张继伟1,2何建凯1,2任奥博3曲朝雷1,2王亚杰1,2
Cross-Hole Computed Tomography in Geological Investigation of Shenzhen Metro Complex Karst Section
ZHANG Jiwei1,2HE Jiankai1,2REN Aobo3QU Chaolei1,2WANG Yajie1,2
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作者信息:1.北京城建勘测设计研究院有限责任公司， 100101， 北京
2.城市轨道交通深基坑岩土工程北京市重点实验室， 100101， 北京
3.天津市测绘院有限公司， 300381， 天津
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Affiliation:1.Beijing Urban Construction Survey and Design Institute Co., Ltd., 100101, Beijing, China
2.Beijing Key Laboratory of Geotechnical Engineering for Deep Foundation Pit of Urban Rail Transit, 100101, Beijing, China
3.Tianjin Institute of Surveying and Mapping Co., Ltd., 300381, Tianjin, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.04.049
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中图分类号/CLCN:TU195+.1
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栏目/Col:应用技术
摘要:
［目的］深圳地铁复杂岩溶段的地质勘察精度要求高，有必要对岩溶勘察常用的不同CT(计算机断层扫描)法进行研究。［方法］基于深圳地铁16号线等项目的岩溶勘察实践，对深圳地区岩溶勘察用到的弹性波CT法、电磁波CT法、电阻率CT法等多种物探手段进行了分析。比较各种CT法的测试成果，并结合探测孔验证信息，分析得出各种CT法的优势及适用性。结合深圳地铁16号线的实际应用效果对探测结果进行验证。［结果及结论］电磁波CT法对岩面刻画的精细程度不及弹性波CT法。电磁波CT法在长探测孔距方面有优势。弹性波CT法的工作效率比电磁波CT法工作效率更高。与电阻率CT法相比，弹性波CT法的解译结果更接近实际地层。弹性波CT法易受环境振动干扰，电阻率CT法易受电磁环境干扰。16号线实际应用效果表明，以弹性波CT法作为主要岩溶勘察物探手段所取得的成果是较为可靠的。
Abstracts:
［Objective］ The geological survey of Shenzhen Metro complex karst section requires high accuracy, and it is necessary to study the different CT (computed tomography) methods commonly used in karst exploration. ［Method］ Based on the practice of karst exploration on Shenzhen Metro Line 16 and other projects, various geophysical prospecting methods such as elastic wave CT, electromagnetic wave CT and resistivity CT used in karst exploration in Shenzhen are analyzed. The test results of various CT methods are compared, and their advantages and applicability are analyzed by combining the verification information of the probe/detection holes. The detection results are verified in combination with the practical application effect of Shenzhen Metro Line 16. ［Result & Conclusion］ The electromagnetic wave CT method is not as precise as the elastic wave CT method in depicting the rock surface, but the electromagnetic wave CT method has advantages in terms of long detection hole distance. The working efficiency of elastic wave CT method is higher than that of the electromagnetic wave CT method. Compared with resistivity CT method, the interpretation results of elastic wave CT method are closer to the actual strata. The elastic wave CT method is susceptible to environmental vibration interference, and the resistivity CT method is susceptible to electromagnetic environmental interference. The practical application effect of Line 16 shows that results obtained by using elastic wave CT method as the main karst exploration geophysical means are relatively reliable.
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