摘要
为了解掌子面前方不良地质体赋存状况,保障工程施工安全,提出基于全波形反演的探地雷达隧道超前探测数据解译方法。首先,考虑隧道典型不良地质类型,建立溶洞、岩体裂隙和岩体破碎带等数值模型,进行正演模拟分析,总结典型不良地质体的地质雷达正演响应特征。其次,基于全波形反演方法对正演模拟数据进行处理,得到最优的相对介电常数分布,分析反演结果,并总结其相较于正演剖面图解译的优势。研究结果表明,全波形反演可以得到探测区域相对介电常数的较准确分布,得到的不良地质体形态与真实情况较为一致,成像效果明显优于原始雷达剖面图,提高了对不良地质体进行判断的直观性和准确性。
An interpretation method for advance geological prediction data of tunnel by ground penetrating radar(GPR)is put forward based on full waveform inversion,so as to learn the unfavorable geology ahead of tunnel face and guarantee the tunnel safety.Firstly,the typical unfavorable geological conditions are taken into consideration,numerical models for karst caves,fractures and broken zones are established,the forward simulation analysis is carried,and the forward simulation responses of GPR to typical unfavorable geology are summarized.And then,the optimal distribution of relative permittivity is obtained by using full waveform inversion to process the forward simulation data;the inversion results are analyzed and compared with the forward simulation data.The study results show that the relatively exact distribution of the relative permittivity in the prediction area can be obtained by full waveform inversion;the inversion results are consistent with the actual morphology of the unfavorable geological body,and the imaging results are better than the original GPR profile,which can improve the intuition and accuracy of the prediction of the unfavorable geological body.
作者
张崇民
张凤凯
李尧
ZHANG Chongmin;ZHANG Fengkai;LI Yao(Research Center of Geotechnical and Structure Engineering,Shandong University,Jinan 250061,Shandong,China)
出处
《隧道建设（中英文）》
北大核心
2019年第1期102-109,共8页
Tunnel Construction
关键词
隧道施工
不良地质
超前地质探测
探地雷达
正演模拟
全波形反演
tunnel construction
unfavorable geology
advance geological prediction
ground penetrating radar(GPR)
forward simulation
full waveform inversion
