高密度电阻率法在高速公路岩溶探测中的应用

随着高速公路建设的快速发展，岩溶作为一种典型的不良地质现象在施工建设中的危害越来越明显的显现出来。作者在常张高速和邵怀高速采用高密度电阻率法做了大量的探测工作。该方法能进行二维地电断面测量，兼具剖面法和测深法的功能，较常规电阻率法快速、高效，特别是采集的数据量十分丰富，而数据量丰富是物探工作中所追求的，这也是高密度电阻率法的最主要的特点。本文是作者根据在常张高速十七合同段工作中的几个实例，对该方法在岩溶地区中的应用作了一番浅述。与常规电阻率一样，高密度电阻率法可以采用多种装置和方法，但为了连续测量和图象处理，一般采用三极装置（所成图象为矩形），根据现场不同的地质情况，选取合适的剖面数和极距。通过此次探测，查明了测区内的岩溶病害（包括其形态、规模及走向），节约了大量的工程成本。

APPLICATION OF HIGH DENSITY RESISTIVITY METHOD TO THE DETECTING OF KARST COLLAPSE ON THE FREEWAY

There are many karst collapse regions in the country. With the rapid development of the freeway construction,the hazard of karst collapse as a typical real-geology phenomenon in the construction is revealed more and more apparently. The author used the high density resistivity method to do lots of reconnaissance on two freeways. The method can survey the plane geoelectric profile with the profile method and sounding method. It can survey more fast than the normal resistivity method and in particular it can collect a lot of data that is what we have etpected, so it is the leading feature of the high density resistivity. The instances in the article are based on the work of Changzhang freeway. Like the normal resistivity method,the high density resistivity has various sets and methods, but we adopt MN-B sets as a rule because it will be expedient for detecting and graph transaction, then the suitable profiles and polar distances should be set up according to the geological circumstance. We find out the karst collapse detecting in the area has saved lots of project cost. We should believe that the high density resistivity will be used in the field more widely.