TGP地震预报技术在隧道超前地质预报中数据异常原因分析及处理措施

隧道施工常采用地震反射波法采集地震波数据,受施工进度、地质情况、现场配合、操作人员水平等因素限制,使得很多采集到的数据出现异常。为提高数据采集质量,避免出现异常数据,通过TGP地震预报技术在铁路隧道工程中的应用实践,从触发与装药、电压(流)干扰、耦合不良、隧道管波、岩性变化5方面分析总结异常数据出现的原因,并提出相应的处理措施:1)提高装药质量;2)远离高压电缆及设备;3)保证成孔质量;4)做好注水和堵孔;5)重视基础地质工作。通过采取以上措施,达到准确预报前方地质情况的目的。

Analysis on Abnormal Data in TGP Advance Geological Prediction in Tunneling and Countermeasures

Seismic reflection wave is widely used in advance geology prediction in tunneling. Due to the restrictions of construction schedule,geological condition,site cooperation and operators level,however,a lot of data acquired in TGP geology prediction are abnormal. In the paper,the causes for the abnormal data are analyzed in terms of triggering and charging,voltage（ current） interference,coupling,tunnel tube wave and lithology changing,and countermeasures, including 1） improving the charging quality; 2） keeping TGP prediction far from high voltage cables and equipment; 3） ensuring the borehole quality; 4） doing a good job in water injection and hole plugging; 5） paying more attention to the basic geological works,are proposed.