三维直流电法在岩溶地区桥基勘察中的应用
摘要
在岩溶地区桥基勘察中,由于岩溶发育形态复杂,基岩面起伏巨大,溶洞多为不规则的三维体,单一钻探手段很难达到勘察精度要求,而传统的二维电法勘探受到测线密度的限制和存在旁侧效应的影响,勘察效果也往往不理想,甚至造成误判。本文采用三维直流电法,针对常见的溶洞形态选用合适的地电模型的数值模拟结果,选取岩溶区高速公路桥基进行了现场试验,并通过钻孔验证,结果表明:三维直流电法,能有效地克服旁侧效应,清楚地反映了桥基岩溶发育的空间分布形态,提高溶岩地区桥基勘探精度。同时,三维直流电法矩形阵列布极测量方式,也非常适合公路桥梁扩大基础或桩基承台的矩形结构特点。
引文
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[8]Grimm,R.E.,Olhoeft,G.R.,McKinley,K.,et al.Nonlinear complex-resistivity survey for DNAPL at the Savannah River site A-014outfall[J].Journal of environmental&engineering geophysics,2005,10(4):351-364.
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[11]Loke M.H.and Barker R.D.Practical techniques for3D resistivity surveys and data inversion[J].Geophysics.Prospecting.1996,44:499-523.
[12]许新刚,岳建华,武杰.三维直流电法勘探在地下人防工程勘察中的应用[J].物探与化探,2004,28(2):187-188.
[2]郭秀军,王兴泰.用高密度电阻率法进行空洞探测的几个问题[J].物探与化探,2001,25(4):306-315.
[3]Pridmore D F,Hohman G W,Ward S H,et al.An investigation of finite element modeling for electrical and electromagnetic data in three dimensions.Geophysics,1981,46:1009～1024.
[4]江玉乐,康万福,张楠,等.高密度电法在岩溶勘察中的应用[J].成都理工大学学报(自然科学版),2007,34(4):452-455.
[5]Dahlin H.and Loke M.H.Resolution of2D wenner resistivity imaging as assessed by numerical modeling[J].Journal of Applied Geophysics,1998,38:237-249.
[6]Dey A.and Morrision H.F..Resistivity modeling for arbitrary shape two-dimensional structures[J].Geophysical Prospecting.1979a,27:1020-1036.
[7]丑景俊,王进,孟琪.高密度电阻率法应用技术研究[J].东北地震研究,1995,11(4):54-57.
[8]Grimm,R.E.,Olhoeft,G.R.,McKinley,K.,et al.Nonlinear complex-resistivity survey for DNAPL at the Savannah River site A-014outfall[J].Journal of environmental&engineering geophysics,2005,10(4):351-364.
[9]Owen R.J.,Gwavava O.,Gwaze P..Multi-electrode resistivity survey for groundwater exploration in the Harare greenstone belt,Zimbabwe[J].Hydrogeology journal,2006,14(1-2):244-252.
[10]黄俊革,王家林,阮百尧.三维高密度电阻率E-SCAN法有限元模拟异常特征研究[J].地球物理学报,2006,49(6):1206-1214.
[11]Loke M.H.and Barker R.D.Practical techniques for3D resistivity surveys and data inversion[J].Geophysics.Prospecting.1996,44:499-523.
[12]许新刚,岳建华,武杰.三维直流电法勘探在地下人防工程勘察中的应用[J].物探与化探,2004,28(2):187-188.
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