【摘要】 由于地理因素和历史等原因，城市地下圆形空洞“多”“密”“乱”的状况越来越严重，地质雷达圆形空洞扫描图像解析并不明确。基于地质雷达扫描探测全过程，将雷达紧贴地面扫描地下圆形空洞的全过程图像细分为三个阶段，建立各阶段水平距离与回波延时之间的关系，系统分析不同埋深，不同半径条件下圆形空洞地质雷达扫描图像的变化情况，结合探测实例实现地下圆形空洞地质雷达成像机理的科学解释。总结出地下圆形空洞雷达扫描图像对称轴左侧为单调递减的连续凹函数，厚度由不断增大至稳定；对称轴右侧为单调递增的连续凹函数，厚度由稳定至不断减小；随着埋深与半径增大，曲线曲率减小，曲线图像趋于缓和，曲线的特征体现出张开弧度增大的趋势。更多还原

【Abstract】 Due to geographical factors and historical reasons, urban underground circular cavity “many”, “dense”, “chaotic” situation is more and more serious, geological radar circular cavity scanning image analysis is not clear. Based on the whole process of geological radar scanning and detection, the whole process of radar scanning underground circular cavity was divided into three stages. The relationship between horizontal distance and echo delay in each stage was established. The changes of circular cavity geological radar scanning images under different buried depths and different radii were systematically analyzed. Combined with the detection example, the scientific explanation of the imaging mechanism of underground circular cavity geological radar was realized. It is concluded that the left side of the symmetric axis of the underground circular cavity radar scanning image is a monotonically decreasing continuous concave function, and the thickness increases from constant to stable. The right side of the symmetric axis is a monotonically increasing continuous concave function, and the thickness decreases from stable to constant. With the increase of buried depth and radius, the curvature of the curve decreases, and the curve image tends to be relaxed. The characteristics of the curve reflect the trend of increasing openness.更多还原