高墩大跨及地质条件复杂特大桥物探模式

Geophysical Exploration Pattern for the Bridge with High Pier and Big Span Under Complex Geological Condition

研究目的:以大(理)瑞(丽)线怒江特大桥和丽(江)香(格里拉)线金沙江特大桥为例,对高墩、大跨且地质条件特别复杂的特大桥综合物探模式进行研究,在兼顾勘探深度和勘探费用的原则下,达到提高探测精度的目的。研究结论:高墩、大跨且地质条件特别复杂的特大桥综合物探模式为:(1)分宏观、中等和较细三个层次的精度进行探测;(2)选择的物探方法为音频大地电磁法(CSAMT或AMT)、浅层地震反射波法、直流电测深法(或高密度电法)、跨孔弹性波层析成像(CT)法、跨孔电磁波层析成像(CT)法及单孔测井法;(3)工作重点放在定测(补定测)阶段、推荐方案的主墩位置。

Research purposes： Taking the Nujiang River Bridge of the Dali - Ruili Railway and the Jinsha River Bridge of the Lijiang - Xianggelila Railway as examples, in the light of the principle of giving consideration to the exploration depth and the exploration expense, the study was done on the comprehensive geophysical exploration pattern for the bridge with high pier and big span under the complex geological condition in order to enhance the exploration precision. Research conclnsions：The comprehensive geophysical exploration patterns for the bridge with high pier and big span under complex geological condition are as follows ： （ 1 ） The comprehensive geophysical exploration is conducted with the three levels of the exploration precision. （2）The selected geophysical methods include the audio magnetotellurie method （CSAMT or AMT） , shallow seismic reflection wave method, DC electric sounding or high density resistivity method, tomography on cross -hole elastiel wave method, tomography on cross- hole electromagnetic wave method and single - hole well logging method. （3） The attention should be paid to the location survey stage and the main pier position of the recommended plan.