电磁波CT技术在溶洞勘察中的应用效果分析
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摘要
溶洞、裂隙发育是桩基工程施工中的主要安全隐患之一,因此,溶洞勘察在工程中显得尤为重要。传统的溶洞勘察方法以电阻率法为主,但是受限于该法的勘探深度,同时其勘探结果也不能确定溶洞的边界,钻探也只是在极小的范围确定岩层的溶蚀状况。电磁波层析成像(简称电磁波CT)是一种发展中的地球物理勘探技术,它以电磁波在不同介质中传播特性不同作为勘探理论基础。本文以电磁波CT技术在某特大桥桥基岩溶勘察的结果,结合井中录像以及钻孔资料来证明该技术在溶洞勘察方面具有显著的效果。
The exploration of solution cavity is essential in the construction of pile foundation that results from the solution cavity and crack. Traditional method of solution cavity exploration is mainly based on resistivity method. However, depth is limited and boundary of solution cavity can't be obtained in this method. Additionally, drilling method can only explorer the karst cavity in an infinitesimal area. Electromagnetic Wave Computer Tomography (EWCT) is a developing geophysical method based on characteristics of spreading of electromagnetic wave in different medium. This paper mainly aims to substantiate the effect of karst cavity exploration with the method of EWCT. Result obtained by EWCT has been compared with kinescope and drilling data in an exploration of karst cavity in a huge bridge foundation. The result shows that EWCT is an effective method for karst cavity exploration.
The exploration of solution cavity is essential in the construction of pile foundation that results from the solution cavity and crack. Traditional method of solution cavity exploration is mainly based on resistivity method. However, depth is limited and boundary of solution cavity can't be obtained in this method. Additionally, drilling method can only explorer the karst cavity in an infinitesimal area. Electromagnetic Wave Computer Tomography (EWCT) is a developing geophysical method based on characteristics of spreading of electromagnetic wave in different medium. This paper mainly aims to substantiate the effect of karst cavity exploration with the method of EWCT. Result obtained by EWCT has been compared with kinescope and drilling data in an exploration of karst cavity in a huge bridge foundation. The result shows that EWCT is an effective method for karst cavity exploration.
引文
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[9]李张明.电磁波层析成像技术在溶洞探测中的应用[J].中国岩溶,1995,14(4):372-378.Li ZM.Application electromagnetic wave computerized tomography in cave detection[J].Carsologica Sinica,1995,14(4):372-378.
[10]崔春林.钻孔电磁波层析成像CT技术及其应用[J].山西水利科技,2005,155:83-85.Cui CL.The application of borehole electro-magnetic wave CT technique to engineering exploration[J].Shanxi Hydrotechnics,2005,155:83-85.
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[2]蔡加兴.电磁波CT技术在水库堤坝隐患探测中的应用[J].人民长江,2002,33(1):21-22.Cai JX.Application of electromagnetic wave CT technology in detecting hidden defects of dams and dykes[J].Yangtze River,2002,33(1):21-22.
[3]邱恩喜,谢强,文江泉.电测深法和电磁波CT法在采空区注浆加固效果检测中的综合应用[J].工程地质学报,2007,15(6):834-839.Qiu EX,Xie Q,Wen JQ.Application of the combination of electric sounding and electromagnetic CT in detection of grouting quality[J].Journal of Engineering Geology,2007,15(6):834-839.
[4]邱陶兴,王洪涛,陶裕录.电磁波井间CT成像技术及其在岩土工程中的应用[J].华南地震,1994,14(3):16-23.Qiu TX,Wang HT,Tao YL.The basic principle of cross hole electromagnetic tomography and its application to coil engineering[J].South China Journal of Seismology,1994,14(3):16-23.
[5]宋先海,李瑞有,廖勇龙,等.基于电磁波CT技术的复杂地质异常探测[J].资源环境与工程,2008,22(增刊):230-232.Song XH,Li RY,Liao YL,et al.The detection of complex geologic anomaly based on electromagnetic wave technology[J].Resources Environment&Engineering,2008,22(S1):230-232.
[6]宋文荣,吴仪芳,刘建达,等.电磁波层析成像技术(CT)在地基勘探中的应用[J].地震学刊,1994,2:62-64.Song WY,Wu YF,Liu JD,et al.The application of borehole electro-magnetic wave CT technique in foundation exploration[J].Journal of Seismology,1994,2:62-64.
[7]吴以仁.地下电磁波法正反演问题研究综述[J].物探化探计算科技,1988,10(4):289-296.Wu YR.Studing of forward and inverse problems on the underground electromagnetic waves[J].Computing Techniques for Geophysical and Geochemical Exploration,1988,10(4):289-296.
[8]邱维衍.电磁波层析成像CT技术在山区场地勘探中的应用[J].福建建筑高等专科学校学报,2001,3(3):83-85.Qiu WY.Scansion technology by electromagnetic wave used on the exploring in mountain area[J].Journal of Fujian College of Architecture&C E,2001,3(3):83-85.
[9]李张明.电磁波层析成像技术在溶洞探测中的应用[J].中国岩溶,1995,14(4):372-378.Li ZM.Application electromagnetic wave computerized tomography in cave detection[J].Carsologica Sinica,1995,14(4):372-378.
[10]崔春林.钻孔电磁波层析成像CT技术及其应用[J].山西水利科技,2005,155:83-85.Cui CL.The application of borehole electro-magnetic wave CT technique to engineering exploration[J].Shanxi Hydrotechnics,2005,155:83-85.
[11]夏金儒,陈石羡.电磁波CT成像技术在防水工程场地勘查中的应用[J].资源环境与工程,2007,21(S0):101-103.Xia JR,Chen SX.CT image by electromagnetic wave in water prevention projects[J].Resources Environment&Engineering,2007,21(S0):101-103.
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