综合物探方法在工程基础勘探中的应用

THE APPLICATION OF INTEGRATED GEOPHYSICAL PROSPECTING IN THE ENGINEERING FOUNDATION EXPLORATION

工程物探作为工程勘察的重要手段,凭借着高效、无损、高密度、低成本的特点,在场地基础勘察中发挥着重要的作用。但单一的物探方法会受到地质及地球物理条件的限制,从而使物探精度受到影响。采用综合物探方法可以提高物探成果的分析质量和地质解释精度,满足工程勘察的要求。这里结合工程实例,使用高密度电法、浅层地震反射法和地质雷达等三类不同的物探方法技术,进行工程基础勘探。由于这三类不同的物探方法体现了工程基础的不同物理特性,通过对这三类物探方法取得的成果相互比较和综合分析,并结合地质资料得到的综合物探成果,经钻孔验证,其准确性得到了大大提高,取得了很好的勘探效果。同时,还对使用的物探方法的原理、技术、资料的解释等应当注意的问题进行了说明。

Engineering geophysical exploration has been playing an important role in foundational site investigation as an important means of engineering investigations by virtue of its high efficient,non-destructive,high-density,low-cost characteristics.Single geophysical method will be subject to geological and geophysical constraints,so that the geophysical accuracy can be affected.Integrated geophysical methods can improve the quality of the analysis of the geophysical results and the accuracy of the geological interpretation to meet the requirements of the engineering investigation.In this article,with the particular engineering cases,three different types of geophysical methods and techniques including two-dimension resistivity,shallow seismic reflection and geological radar are taken as examples used in engineering foundation exploration.Because three different types of geophysical methods reflect different physical properties on engineering fundamentals,the accuracy of the comprehensive exploration results has been greatly improved,and made a good exploration results by a comparison and comprehensive analysis between the geophysical results and geological data,and the results are verified by drilling.The article also introduced the principle,techniques and data interpretation of the used geophysical methods,which should be noticed in practice.