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首页> 外文会议>Rock Mechanics in the National Interest >Assessing microcrack damage around a tunnel at the Underground Research Laboratory using ultrasonic velocity tomography
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Assessing microcrack damage around a tunnel at the Underground Research Laboratory using ultrasonic velocity tomography

机译：使用超声波速度层析成像技术在地下研究实验室评估隧道周围的微裂纹损伤

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Ultrasonic wave velocity measurements were made around one quadrant of a tunnel at Atomic Energy of Canada's Underground Research Lab. The purpose of these measurements was to characterize the microcrack population induced during excavation of the tunnel at 420 m depth. An array of 1 m deep boreholes were drilled from the sidewall to a well-developed notch in the roof. Velocity measurements were made by pulsing on a source transducer at numerous points within a hole and on the tunnel surface, and then capturing the transmitted waves at receivers in the adjacent holes. The travel times of the waves between sources and receivers were used to compute the velocities and to construct a 2D tomographic image of the slowness (the inverse of velocity) and the anisotropy in this region. Velocities in the sidewall and midway to the notch are low and show significant anisotropy, indicating the presence of microcracks even as deep as 1 m from the tunnel wall. Velocities are high in the notch region with low anisotropy, indicating the rock there is relatively undamaged.
机译：超声波速度的测量是在加拿大地下研究实验室的原子能实验室的一个隧道周围进行的。这些测量的目的是表征在420 m深度的隧道开挖过程中引起的微裂纹种群。从侧壁上钻了一个1 m的深孔阵列，在屋顶上形成了一个发达的凹口。速度测量是通过在孔内和隧道表面上多个点处的源换能器上进行脉冲化，然后在相邻孔中的接收器处捕获发射波来进行的。波在源和接收器之间的传播时间用于计算速度，并构造该区域的慢度（速度的倒数）和各向异性的二维断层图像。侧壁和槽口中部的速度很低，并且显示出明显的各向异性，这表明甚至在距隧道壁深1 m处都存在微裂纹。缺口区域的速度较高，各向异性较低，表明该处的岩石相对未受损。

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