磁测在港航工程勘察中的几个实例

在地质矿产、石油天然气、区域地质调查中曾经得到广泛应用的磁法勘探技术，却在工程地质勘察中少见有关报道，但并非在工程地质勘察中磁法勘探技术无所作用，本文主要根据作者参与完成的工程地质勘察项目，介绍了磁法勘探的原理及相关技术，指出在满足投入磁法勘探的地球物理前提条件下，磁法勘探在对海底管线、地下掩体、水下沉船、炸弹类危险爆炸物等磁性目标体探测方面，具有效率高，效果明显的特色。而在水域进行磁法勘察，更有独到的优势。特别是在历史上曾经发生过军事争斗的地区进行工程建设，投入磁法普查寻找炸弹类危险爆炸物，是保证工程建设安全进行的基础工作。

APPLICATION OF MAGNETIC SURVEY IN GEOTECHNICAL INVESTIGATION FOR HARBOR AND SEA-ROUTE ENGINEERING

Magnetic survey has been widely used in exploration for mineral geology, base oil, natural gas, regional geology and so on. However, it has been seldom used in engineering recently. This paper introduces the theory and technique of the magnetic survey, and proves with actual examples that it can be successfully used in wreck ship exploration, pipelines detection and hidden unexploded ordnance exploration etc. under condition of requirements for geophysical investigation. In Harbor and Sea-Route Engineering, the precision of magnetic survey is ideal in the onshore engineering. Especially, if the project area once experienced wars in history, to detect the hidden unexploded ordnance left with magnetic survey, for the purpose of safety, is effective and important.