CAJ | 학술논문

针对我国西部黄土地区特殊的地形地貌、近地表条件和地下浅层目标体，开展了路基下伏地质缺陷地震探测技术的应用研究。为检验不同地震方法的探测能力，设计了一个综合地质地球物理模型，包含凹陷、断层、地裂缝、地下低速体、软弱夹层及滑坡等典型地质缺陷，利用有限差分波场模拟，计算出多分量反射地震记录和面波地震记录，分别进行了反射波成像和高阶面波反演横波速度成像。数值模拟结果表明，反射波成像和高阶面波反演横波速度成像技术对真实模型中的凹陷、断层、浅层低速体、软弱夹层及滑坡等主要地质缺陷均能清晰成像，验证了地震方法探测路基下伏地质缺陷的可行性。数值计算结果表明，不同的地球物理探测方法对地质缺陷的探测效果和适用范围不同。
침대아국서부황토지구특수적지형지모、근지표조건화지하천층목표체，개전료로기하복지질결함지진탐측기술적응용연구。위검험불동지진방법적탐측능력，설계료일개종합지질지구물리모형，포함요함、단층、지렬봉、지하저속체、연약협층급활파등전형지질결함，이용유한차분파장모의，계산출다분량반사지진기록화면파지진기록，분별진행료반사파성상화고계면파반연횡파속도성상。수치모의결과표명，반사파성상화고계면파반연횡파속도성상기술대진실모형중적요함、단층、천층저속체、연약협층급활파등주요지질결함균능청석성상，험증료지진방법탐측로기하복지질결함적가행성。수치계산결과표명，불동적지구물리탐측방법대지질결함적탐측효과화괄용범위불동。
Aiming at the special landform,near surface conditions and subsurface objects in loess districts of western China,the authors studied detecting applications of the seismic techniques.To examine the efficiency of different seismic methods,a comprehensive geological model was designed. This model included some typical defects such as sag,fault,ground fissure,hidden low velocity body, weak intercalated layer and landslide.Multi-component seismic reflections and surface wave records were numerically computed with the finite difference method.Reflection imaging and high order surface wave imaging were acquired respectively.The results of numerical modeling proved that all the typical defects models such as sag,fault,ground fissure,hidden low velocity body,weak intercalated layer and landslide were imaged clearly.The numerical modeling results indicated the feasibility of shallow geological defects detection under roadbed by seismic methods.