基于CSAMT法的地基基础评价
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摘要
针对规划中的唐山市中心高层建筑工区内存在采空塌陷、岩溶塌陷和隐伏构造及地裂缝等不良地质隐患,对地基基础及上层建筑物构成安全威胁等问题,为了给后续施工提供基础地质资料,查明场区内的不良体地质,采用CSAMT进行探测,并采用多种数据处理办法,多测线比较,获取场区内可靠的三维电阻率。通过研究断面图和不同深度的水平切片图的电性分布,对场区的地基进行合理划分与评价。研究结果表明:采用CSAMT探测结果能区分多种不同类型的不良地质结构与构造,并可合理布置钻探位置。
Based on the fact that the high-rise buildings are planning to be built in the center of Tangshan city,which is in the overall reconstruction planning of the city,there is a risk area to build high-rise buildings,gob collapse,karsts collapse,buried structural fracture zone and ground fissures in this area,which would be the disadvantageous factors for the construction of the high-rise buildings,the foundation evaluation with controlled source audio-frequency magnetotelluric method(CSAMT) was executed to find out the potential weak geological structure.Reliable 3D resistivity sets were gotten in the investigated area.The electric distribution of different profiles and horizontal slices in different depths were studied,and the district was obtained and confirmed by drilling information.The results show that the CSAMT detection results can be used to distinguish different types of adverse geologic structure and tectonics,and to arrange the drilling location rationally.
Based on the fact that the high-rise buildings are planning to be built in the center of Tangshan city,which is in the overall reconstruction planning of the city,there is a risk area to build high-rise buildings,gob collapse,karsts collapse,buried structural fracture zone and ground fissures in this area,which would be the disadvantageous factors for the construction of the high-rise buildings,the foundation evaluation with controlled source audio-frequency magnetotelluric method(CSAMT) was executed to find out the potential weak geological structure.Reliable 3D resistivity sets were gotten in the investigated area.The electric distribution of different profiles and horizontal slices in different depths were studied,and the district was obtained and confirmed by drilling information.The results show that the CSAMT detection results can be used to distinguish different types of adverse geologic structure and tectonics,and to arrange the drilling location rationally.
引文
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[15]底青云,王妙月,王若,等.长偶极大功率可控源电磁波响应特征研究[J].地球物理学报,2008,51(6):1917?1928.DI Qing-yun,WANG Miao-yue,WANG Ruo,et al.Study of the long bipole and large power electromagnetic field[J].Chinese Journal of Geophysics,2008,51(6):1917?1928.
[16]吴璐萍,石昆法.可控源音频大地电磁法在地下水勘查中的应用研究[J].地球物理学报,1996,39(5):712?717.WU Lu-ping,SHI Kun-fa.Application of CSAMT to the search for ground water[J].Chinese Journal of Geophysics,1996,39(5):712?717.
[17]魏文博,金胜,叶高峰,等.西藏高原中、北部断裂构造特征:INDEPTH(Ⅲ)-MT观测提供的依据[J].地球科学,2006,31(2):257?265.WEI Wen-bo,JIN Sheng,YE Gao-feng,et al.Features of the faults in center and north tibetan plateau:based on results of INDEPTH(Ⅲ)-MT[J].Earth Science,2006,31(2):257?265.
[18]徐世浙,刘斌.电导率分层连续变化的水平层的大地电磁正演[J].地球物理学报,1995,38(3):262?268.XU Shi-ze,LIU Bin.A numerical method for calculation MT field on a layer model with continuous change of conductivity in each layer[J].Chinese Journal of Geophysics,1995,38(3):262?268.
[19]王光杰,王勇,李帝铨,等.基于遗传算法CSAMT反演计算研究[J].地球物理学进展,2006,21(4):1285?1289.WANG Guang-jie,WANG Yong,LI Di-quan,et al.The application of genetic algorithm to CSAMT inversion[J].Progress in Geophysics,2006,21(4):1285?1289.
[2]吴子泉,尹成.电阻率横向剖面法及其在隐伏断层探测中的应用研究[J].地球物理学报,2007,50(2):625?631.WU Zi-quan,YIN Cheng.Application of schlumberger transverse profiling method to detecting buried faults[J].Chinese Journal of Geophysics,2007,50(2):625?631.
[3]吴子泉,谭捍东,王成虎.电阻率横向剖面法在倾斜断层精确探测中的应用研究[J].地球物理学进展,2006,21(4):1296?1301.WU Zi-quan,TAN Han-dong,WANG Cheng-hu.Application of electric resistivity transverse profiling method to detect oblique faults precisely[J].Progress in Geophysics,2006,21(4):1296?1301.
[4]白登海,王立凤,孙洁,等.城市活断层探测中电磁噪音和环境干扰对浅层电磁方法的影响[J].地震地质,2002,24(4):549?556.BAI Deng-hai,WANG Li-feng,SUN Jie,et al.Effects of urban noise on electromagnetic methods[J].Seismology and Geology,2002,24(4):549?556.
[5]易兵,曾昭发,李恩泽,等.电法探测城市活断层的应用[J].吉林大学学报:地球科学版,2005,35(Suppl):115?118.YI Bing,ZENG Zhao-fa,LI En-ze,et al.The survey and research for alive fault in city by electrical prospecting[J].Journal of Jilin University:Earth Science Edition,2005,35(Suppl):115?118.
[6]刘廷忠,冯辉.在城市地质工作中应重视一种新型电磁法:可控源音频大地电磁法的应用[J].城市地质,2006,1(1):41?48.LIU Ting-zhong,FENG Hui.A new electromagnetic method in 1568中南大学学报(自然科学版)第41卷urban geological work:The application of CSAMT[J].City Geology,2006,1(1):41?48.
[7]吴子泉,刘元生,刘保金,等.地球物理方法在城市地震活动断层精确定位中的应用[J].地球物理学进展,2005,20(2):528?533.WU Zi-quan,LIU Yuan-sheng,LIU Bao-jin,et al.Application of geophysical method to the precise positioning of urban seismic mobile moving fault[J].Progress in Geophysics,2005,20(2):528?533.
[8]Zonge K L,Ostrander A G,Emer D F.Controlled-source audiofrequency magnetotelluric measurements[C]//Vozoff K.Magnetotelluric methods.Soc Expl Geophys Geophysics Reprint Series,1986,5:749?763.
[9]Zonge K L,Hughes L J.Controlled source audio-frequency magnetotellurice[C]//Electromagnetic methods in applied Geophysics.Tulsa:Soc Expl Geophys,1991,2(B):713?809.
[10]底青云,王妙月,石昆法,等.高分辨率V6系统在矿山顶板涌水隐患中的应用研究[J].地球物理学报,2002,45(5):1?5.DI Qing-yun,WANG Miao-yue,SHI Kun-fa,et al.An applied study on prevention of water bursting disaster in mines with the high resolution V6 system[J].Chinese Journal of Geophysics,2002,45(5):1?5.
[11]底青云,石昆法,王妙月,等.CSAMT法和高密度电法探测地下水资源[J].地球物理学进展,2001,16(3):53?54.DI Qing-yun,SHI Kun-fa,WANG Miao-yue,et al.Water resources exploration with CSAMT and high density electric resistivity method[J].Progress in Geophysics,2001,16(3):53?54.
[12]底青云,王妙月,石昆法,等.V6多功能系统及其在CSAMT勘查应用中的效果[J].地球物理学进展,2002,17(4):663?670.DI Qing-yun,WANG Miao-yue,SHI Kun-fa,et al.Multifunction system V6 and its effectiveness in CSAMT exploration[J].Progress in Geophysics,2002,17(4):663?670.
[13]底青云,王光杰,王妙月,等.长偶极大功率可控源激励下目标体电性参数的频率响应[J].地球物理学报,2009,52(1):275?280.DI Qing-yun,WANG Guang-jie,WANG Miao-yue,et al.Frequency response characteristics of target electric property with long bipole large power control source[J].Chinese Journal of Geophysics,2009,52(1):275?280.
[14]底青云,伍法权,王光杰,等.地球物理综合勘探技术在南水北调西线工程深埋长隧洞勘察中的应用[J].岩石力学与工程学报,2005,24(20):3631?3638.DI Qing-yun,WU Fa-quan,WANG Guang-jie,et al.Geophysical exploration over long deep tunnel for west route of South-to-North water transfer project[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(20):3631?3638.
[15]底青云,王妙月,王若,等.长偶极大功率可控源电磁波响应特征研究[J].地球物理学报,2008,51(6):1917?1928.DI Qing-yun,WANG Miao-yue,WANG Ruo,et al.Study of the long bipole and large power electromagnetic field[J].Chinese Journal of Geophysics,2008,51(6):1917?1928.
[16]吴璐萍,石昆法.可控源音频大地电磁法在地下水勘查中的应用研究[J].地球物理学报,1996,39(5):712?717.WU Lu-ping,SHI Kun-fa.Application of CSAMT to the search for ground water[J].Chinese Journal of Geophysics,1996,39(5):712?717.
[17]魏文博,金胜,叶高峰,等.西藏高原中、北部断裂构造特征:INDEPTH(Ⅲ)-MT观测提供的依据[J].地球科学,2006,31(2):257?265.WEI Wen-bo,JIN Sheng,YE Gao-feng,et al.Features of the faults in center and north tibetan plateau:based on results of INDEPTH(Ⅲ)-MT[J].Earth Science,2006,31(2):257?265.
[18]徐世浙,刘斌.电导率分层连续变化的水平层的大地电磁正演[J].地球物理学报,1995,38(3):262?268.XU Shi-ze,LIU Bin.A numerical method for calculation MT field on a layer model with continuous change of conductivity in each layer[J].Chinese Journal of Geophysics,1995,38(3):262?268.
[19]王光杰,王勇,李帝铨,等.基于遗传算法CSAMT反演计算研究[J].地球物理学进展,2006,21(4):1285?1289.WANG Guang-jie,WANG Yong,LI Di-quan,et al.The application of genetic algorithm to CSAMT inversion[J].Progress in Geophysics,2006,21(4):1285?1289.
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