TST技术在某隧道超前地质预报中的应用

Application of TST to tunnel wall rock advanced prediction

TST技术建立在地震逆散射偏移成像理论基础上,采用空间阵列式观测方式、方向滤波、速度扫描和合成孔径偏移成像等专业处理技术,能从隧道内的三维波场中滤除侧向、顶板、底板地震回波,有效提取出前方回波;提供掌子面前方地质精确波速和地质界面位置图像。应用表明,TST技术可有效地用预报掌子面前方软弱岩层的分布范围、规模及节理裂隙发育情况,为隧道安全施工提供保证,对类似工程具有借鉴意义。

TST technology is based on the theory of seismic backscattering migration imaging. It adopts spatial array observation method,directional filtering,velocity scanning,synthetic aperture migration imaging and other professional processing technologies,which can filter out the lateral,roof and floor seismic echoes from the three-dimensional wave field in the tunnel and effectively extract the front echoes. Provides images of precise wave velocity and geological interface position in front of the palm surface. The application shows that the TST technique can effectively predict the distribution range,scale and development of joints and fissures of the weak rock strata in front of the palm surface,which can provide guarantee for the safe construction of the tunnel and can be used for reference for similar projects.