TST地质超前预报技术在N-J水电工程中的应用  

Advanced Geological Hazards Forecast Using TST and Its Application in the Neelum-Jhelum

作　　者：谷江洪 申康路 GU Jianghong;SHEN Kanglu(No. 3 Engineering Co. , Ltd. , China Gezhouba Group, Xi＇an 710000)

机构地区：[1]中国葛洲坝集团第三工程公司

出　　处：《土工基础》2018年第2期224-228,共5页Soil Engineering and Foundation

摘　　要：针对巴基斯坦尼鲁姆-杰卢姆（neelum-jhelum,N-J）水电站引水隧洞的复杂地质条件,开展地质超前预报技术研究。考虑到现有国内外超前预报技术大多存在着技术缺陷,影响预报的可靠性和准确性,N-J TBM引水隧洞采用隧道地震波层析成像（tunnel seismic tomography,TST）技术。应用方向滤波技术,有效地从三维波场中滤除侧向回波,成功提取出掌子面前方回波,实现波场分离;通过空间阵列系统设计和波速扫描技术,有效地解决了前方围岩波速分布问题;采取逆散射偏移成像技术,提高了不良地质体定位精度。现场应用表明,通过采用地质构造偏移成像和围岩波速的相互印证,TST地质超前预报结果与实际地质素描图较为吻合,可为工程地质人员的现场地质构造分析和围岩类别划分等提供参考。The advanced geological hazards forecast study is necessary in the construction of a water tunnel Neelum-Jhelum（NJ）hydro-electricity project in Pakistan due to it complicated geological conditions.The Tunnel Seismic Tomography（TST） was used in the prediction since it has a better reliability and accuracy comparing with most of the existing forecast methods.Using the F-K filtering function,the surface and side reflective waves could be filtered and separated.The reflective wave from the area to be excavated could be extracted.The function of the spatial observation and the velocity scan in the TST gives the precise analyzing of the velocity from the area to be excavated.The inverse scattering migration image can enhance an accurate geological structure locating.The application results showed that the TST method using the migration image and the velocity structure can achieve a relatively accurate advanced geological hazard forecast,compared with the actual geological sketch,which can provide the reference for the field geological tectonic analysis and the surrounding rock mass classification.

关 键 词：地质超前预报 隧道地震波层析成像(TST) 波场分离 波速扫描 逆散射偏移成像 

分 类 号：TU433[建筑科学—岩土工程]