复信号分析技术在地质雷达预报岩溶裂隙水中的应用研究

Study of application of complex signal analysis to predicting karst-fractured ground water with GPR

对岩溶裂隙水进行及时准确的预报,是当前岩溶隧道设计和施工中亟待研究和解决的关键问题。复信号分析技术能够提取多个参数进行综合判断,基于此优点,尝试将复信号分析技术引入到地质雷达探查水体的研究中。对雷达数据中的水体异常分别从振幅、频率和相位等方面进行综合判断,克服了以往判断依据单一的缺点,为利用地质雷达进行岩溶裂隙水预报提供了一种切实可行的方法。首先,介绍了复信号分析技术的原理,阐述了在地质雷达信号处理中引入复信号分析技术的必要性;然后探讨了基于复信号分析技术的地质雷达预报岩溶裂隙水的可行性,得出了判断水体的依据。最后结合工程实例,对地质雷达数据进行了复信号处理,并对岩溶裂隙水进行了综合判断。与开挖结果对比显示,复信号分析技术的运用较大的提高了岩溶裂隙水预报的准确性和可信性。

The precise and immediate forecasting karst-fractured groundwater is a key problem to be studied and resolved currently in tunnel design and construction. Complex signal analysis can be used to extract multiple parameters to make a synthetical judgment. Based on this advantage, it is introduced to the prediction of water with the ground penetrating radar （GPR） to analyze the water response in the radar data from amplitude, frequency and phase, which overcomes disadvantage that the judge criteria is single, and provides a practical method to predict karst-fractured groundwater with GPR. The theory of complex signal analysis and necessity to be introduced to GPR signal processing is first illustrated. Then the feasibility of the karst-fractured groundwater prediction with GPR based on complex signal analysis is discussed; and the criteria to estimate water is obtained. At last, with project example, the GPR data is processed in complex signal analysis and the karst-fractured groundwater is analyzed. It is shown that the application of complex signal analysis improves the accuracy and credibility of prediction greatly in comparison with the excavation result.