【摘要】 详细介绍了等值反磁通瞬变电磁法(OCTEM)及地表形变监测技术(InSAR)的理论与原理。通过对杜家山特大桥所处地段煤矿采空区地质和地球物理条件的分析，对深度为40～150 m范围内的煤矿采空区进行了两种方法的综合勘查。通过对两种手段所获原始数据的处理并结合资料进行分析和解释，有效查明了杜家山特大桥煤矿采空区的位置、形状、空间展布与地表变形特征。项目实践表明：采用等值反磁通瞬变电磁法与InSAR地表形变监测技术综合运用，可探测复杂条件下的煤矿采空区分布情况，并为场地的安全稳定性评估提供重要的参考资料，从而为高速公路桥梁选址及基础设计等提供可靠依据。更多还原

【Abstract】 The theory and principles of the Opposing Coils Transient Electromagnetic Method(OCTEM)and the Interferometric Synthetic Aperture Radar technique(InSAR)are introduced in detail.By analyzing the geological and geophysical conditions of the coal mine goaf in the section where the Dujiashan Bridge is located, the coal mine goafwithin the depth range of 30～150 m is comprehensively surveyedwiththetwointroducedmethods.Combining the information revealed by the existing geological boreholes, the original data obtained by the two methods are processed, analyzed, and interpreted, so, the location, shape, spatial distribution, and surface deformation characteristics of the goaf area of the Dujiashan Bridge Coal Mine are effectively identified.Project practice shows thatby the comprehensive application of Opposing Coils Transient Electromagnetic method and InSAR surface deformation monitoring technology, the distribution of coal mine goaves under complex conditions can be effectively detected, and important reference materials can be provided for site safety and stability assessment, thus, reliable data support can be provided for the site selection and foundation design of highway bridges.更多还原