探地雷达属性在富水强风化地层中的应用分析

作者:王晓曙 赵湖潮 张延杰 许利东 丁红岗 任孟德
单位:云南建投基础工程有限责任公司 西安建筑科技大学土木工程学院
摘要:采用探地雷达进行强风化地层隧道超前地质预报时,受现场探测环境、强风化地层的不均匀性以及解译技术制约,造成富水区雷达反射波的解译困难。将探地雷达瞬时属性和频谱属性应用到富水强风化地层研究中,介绍了瞬时属性和频谱属性的原理,并阐述了探地雷达属性在富水强风化地层预报中的可行性。结合工程实例分析研究表明:富水地层的瞬时振幅增强,瞬时相位轴稀疏,瞬时频率降低。根据100MHz雷达天线实测结果,良好地层的主频值在70MHz左右,富水地层的主频值在30MHz左右。
关键词:隧道地质预报探地雷达强风化地层三瞬属性频谱属性
作者简介:王晓曙,高级工程师,董事长,总经理;*张延杰,工程师,博士,E-mail:yanjie_tm@163.com。
基金:国家十三五重点研发计划(2017YFC0804601);国家自然科学基金地区项目(51764020)。 -页码-:77-80
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Application Analysis of the Ground Penetrating Radar Attributes in Water-rich and Strong-weathered Stratum
WANG Xiaoshu ZHAO Huchao ZHANG Yanjie XU Lidong DING Honggang REN Mengde
(Yunnan Construction and Investment Foundation Engineering Co., Ltd. School of Civil Engineering, Xi'an University of Architecture and Technology)
Abstract: It is difficult to interpret the radar reflection waves in water-rich stratum when using ground penetrating radar(GPR) to forecast the strong-weathered stratum tunnel due to numerous factors, such as the field detection environment, the inhomogeneity of strong-weathered stratum and the interpretation technology and so on. The instantaneous attributes and spectrum attributes of GPR are applied to the study of the water-rich and strong-weathered stratum. The principles of GPR attributes are introduced, and the feasibility of the water-rich and strong-weathered stratum prediction with GPR based on the attributes is expounded. Finally, the examples are analyzed in this paper and it shows that the water-rich and strong-weathered stratum enhance the instantaneous amplitude of reflected signal, the instantaneous phase axis is sparse, and reduce the instantaneous frequency. Based on the results measured by a 100 MHz radar antenna, the dominant frequency value of the good stratum is approximately 70 MHz, and the dominant frequency value of the water-rich stratum is about 30 MHz.
Keywords: tunnels; geological prediction; ground penetrating radar; strong-weathered stratum; three instantaneous attributes; spectrum attribute
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