论文部分内容阅读
针对探地雷达在隧道工程施工探测中可能遇到的常见干扰和典型不良地质体,探讨了常见干扰的成因及其对资料解释的影响,确定干扰信息在剖面图上的反映,并分别对天线耦合干扰和金属物干扰进行举例分析,提出探地雷达在采集数据过程中避开干扰的注意事项。列举三个工程实例,分别介绍了探地雷达对溶洞、断层裂隙水、软弱夹层等不良地质体的预报研究,通过分析其典型雷达剖面图的波形、频率、振幅等特征,依此推断出隧道开挖掌子面前方潜在不良地质体的类型以及位置、构造走向等空间分布特征。该结果与实际开挖揭示的不良地质体的分布范围基本一致,验证了探地雷达在预报隧道常见不良地质体的可行性和有效性。通过总结分析常见雷达干扰图像和典型不良地质体剖面图,有助于为物探工作者对复杂地质体进行更精确地解释提供参考,确保隧道施工安全。
Aiming at the common interferences and typical bad geologic bodies that GPR may encounter during the construction of tunneling projects, the causes of common interferences and their influences on data interpretation are discussed, and the interference information is reflected on the profiles. The influences of antennas Coupling interference and metal interference are analyzed as examples, and the precautions of GPR avoiding the interference in data collection are put forward. Three engineering examples are listed, which respectively introduce the research of forecasting of the bad geologic bodies such as cave, fault fissure water and weak interlayer by GPR. By analyzing the characteristics of the waveform, frequency and amplitude of the typical radar profile, it is deduced that the tunnel The types of potential adverse geological bodies in front of the excavation face and the spatial distribution characteristics such as the location and tectonic trend. The results are basically consistent with the distribution of poor geological bodies revealed by actual excavation, which verifies the feasibility and effectiveness of GPR in forecasting common bad geological bodies in tunnels. By summarizing the common radar interference images and typical bad geological body profiles, it is helpful to provide references for geophysical workers to interpret complex geologic bodies more accurately and ensure the safety of tunnel construction.