探地雷达探测技术在奉先寺保护工程中的应用

The application of ground penetrating radar technology to the protection engineering of Fengxian temple

为了查明龙门石窟奉先寺周边岩体裂隙、岩体破碎带分布以及奉先寺顶部覆盖层厚度,为奉先寺的渗水治理提供基础资料,将探地雷达无损检测技术应用于奉先寺保护工程。探测结果显示,奉先寺顶部岩体较完整,神仙洞与卢舍那大佛之间裂隙和破碎带较多,形成了交叉网络渗水通道;奉先寺顶部覆盖层呈凹形分布,厚度在1~2.2m之间,有利于雨水的贮存和滞留。此次工程实践表明,将探地雷达技术应用于奉先寺岩体裂隙和覆盖层厚度调查是可行的,探地雷达在岩土文物保护中有巨大的应用前景。

Geological radar,which is nondestructive,fast,convenient and economical,are widely used in the field of archaeology and cultural relics protection. In order to find out the rock fractures surrounding Fenxian temple,the distribution of fracture zones in rock mass and the Quaternary overburden thickness at the top of Fengxian temple so as to provide the basis data for ooze water prevention and control of Fengxian temple,the authors employed the geological radar non-destructive testing technology to the protection engineering of Fengxian temple. This paper expounds the basic principle of geological radar and detection methods and focuses on the application of geological radar to the Fengxian temple＇s protection engineering. The detection results show that the rock mass at the top of the Fengxian temple is complete,and the crack and fracture zones between the Giant Buddha and the Fairy Cave are numerous,forming the crossed network seepage channel. At the top of Fengxian temple,the Quaternary overburden is concave,which is conducive to the rain water storage and retention,with the thickness between 1. 0 ~ 2. 2 m. The engineering practice indicates that using geological radar to survey the distribution of fracture zones of rock mass and the Quaternary overburden thickness is feasible,and that the geological radar has considerable application prospect in rock and soil conservation.