路基空洞二维面波响应数值模拟

Numerical Simulation of 2D Surface Wave Response of Subgrade Cavity

中国城市路面塌陷情况严重,道路病害探测和预警已成为城市道路安全运营的日常工作,但受制于地球物理探测仪器和方法,一般采用地质雷达可以快速探测0~3 m范围内的病害,但对深部病害很难控制。面波作为一种高效、无损的地球物理方法,已广泛应用于城市地下空间探测研究。从路基空洞的二维面波正演模拟出发,研究空洞的面波数值模拟响应特征,并采用CMP方法提取共中心点道集,通过提取频散曲线、反演获得面波波速断面与模型基本相同。并通过二维面波探测路基空洞、孤石的案例,证实二维面波具有较高的横向分辨率,为今后开展类似工作提供了参考。

The road collapse in China is serious.Road disease detection and early warning have become the daily work of urban road safety operation.However,due to geophysical detection instruments and methods,it is difficult to control the deep diseases by using GPR to detect diseases within 0~3 m range quickly.Surface wave,which is an efficient and non-destructive geophysical method,has been widely used in the research of urban underground space exploration.The response characteristics of the surface wave of the cavity are studied from the 2D forward modeling of the surface wave of the subgrade cavity.The common center point gathers are extracted by CMP method.The surface wave velocity section is basically the same as the model by extracting the dispersion curve and inversion.The case study of two-dimensional surface wave detection of subgrade cavity and boulder proves that the two-dimensional surface wave has high transverse resolution,which provides a reference for similar work in the future.