【摘要】 随着城市化进程的加快，城市地下空间中各类洞室数量不断增加，给地质雷达探测带来了新的挑战。针对椭圆形空洞的地质雷达探测成像特征不清的问题，通过理论分析将地质雷达扫描检测的全过程作为研究对象，将雷达贴地扫描地下椭圆形空洞的图像分为三个阶段，建立不同阶段回波信号与水平位置的对应关系，系统分析不同埋深和不同几何参数下椭圆形空洞地质雷达扫描图像的变化情况，并结合实际工程探测案例实现椭圆形空洞地质雷达成像机理的科学解释。结果显示：椭圆形空洞地质雷达成像机理与实际工况大致相符，证实椭圆形空洞成像机理能够准确地分析地下椭圆形空洞的位置和发育程度等情况，可为地铁隧道施工以及城市道路灾害的排查防治提供理论支持和参考。更多还原

【Abstract】 With the acceleration of urbanization, the number of various underground chambers in cities is continuously increasing, posing new challenges for geological radar detection. Aiming at the problem of unclear imaging characteristics of geological radar detection of elliptical cavities, the entire process of geological radar scanning was taken as the research object through theoretical analysis. The images of radar ground-penetrating scans of underground elliptical cavities were divided into three stages, and the corresponding relationships between echo signals and horizontal positions at different stages were established. The changes in geological radar scan images of elliptical cavities under different burial depths and different geometric parameters were systematically analyzed. Combined with practical engineering detection cases, a scientific explanation of the imaging mechanism of geological radar for elliptical cavities was provided. The research results show that the imaging mechanism of elliptical cavities in ground-penetrating radar is generally consistent with actual working conditions, confirming that the imaging mechanism of elliptical cavities can accurately analyze the location and development level of underground elliptical cavities, and can provide theoretical support and reference for subway tunnel construction and the subseque-nt investigation, prevention, and control of urban road hazards.更多还原