隧道衬砌不密实的探地雷达数值模拟

Numerical Simulation of Ground Penetrating Radar of Non-Compactness of Tunnel Lining

隧道二次衬砌混凝土不密实容易导致应力集中、积水受冻融影响加大以及衬砌开裂等问题.然而,相对于隧道衬砌中其他缺陷而言,不密实属于渐变的、较隐晦的缺陷,后续处理人员难以准确判断.时间域有限差分法是探地雷达数值模拟中较为常用且成熟的方法,利用时间域有限差分探地雷达数值模拟方法,建立不密实衬砌的理论电磁场分布,总结出不密实衬砌在探地雷达探测结果中的反射特征以及判别方法,可为隧道检测人员提供借鉴.

The non-compactness of tunnel secondary lining concrete is likely to cause problems such as concentration of stress, more effects of gathered water on freezing and thawing, and lining cracks. However, different from other faults of tunnel lining, non-compactness is a fault which gradually varies and indiscoverable. Finite difference time domain is a commonly used and efficient method to numerically simulate ground penetrating radar. This method is used to build electromagnetic field distribution of non-compactness of tunnel lining. The reflection characteristics of the non-compactness of tunnel lining are summarized, and the way of discovering the lining is found, which can provide help for tunnel detecting personnel.