Identification of karst features using seismic P-wave tomography and resistivity anisotropy measurements
Identification of karst features using seismic P-wave tomography and resistivity anisotropy measurements
复制标题
DOI：
10.1007/s00254-003-0953-4
复制
发表时间：
2004-01
期刊：
影响因子：
--
通讯作者：
A. Karaman;T. Karadayilar
中科院分区：
文献类型：
--
作者：
A. Karaman;T. Karadayilar
位于土耳其伊斯坦布尔老城区以西 10 公里处的喀斯特地形上，一座可容纳 10 万名观众的足球场正在建设中。通过多个钻孔在运动场下方发现了约 30 立方米的大空洞，因此需要进行地球物理调查以进一步调查运动场的一部分。我们利用地震折射断层扫描和直流电方法以及旋转温纳阵列来描绘具有溶液空隙和空腔的区域。通过断层扫描反演识别出低速区域的钻孔的总岩心采收率 (TCR) 为 5-15%，而在较高速度区域中，TCR 值高于 60%。断层扫描图像中的低速区和随深度增加的电阻率各向异性似乎表明空腔向西和向南延伸，深度约为 8 m，尽管向南和向西延伸的特征发生了变化。
A football stadium with a capacity of a hundred thousand spectators is under construction over a karst terrain, 10 km west of the old town of Istanbul, Turkey. A large cavity of approximately 30 m3was detected beneath the sports field through a number of boreholes so that a geophysical survey was required to further investigate a portion of the sports field. We utilized seismic refraction tomography and dc-electrical method with rotated Wenner array to delineate zones with solution voids and cavities. Total core recovery (TCR) was 5–15% from boreholes where zones with low velocities were identified through tomographic inversion, whereas TCR values were above 60% in zones with higher velocities. Both low velocity zones in the tomographic images and increasing resistivity anisotropy with depth appear to indicate that the cavity extends toward the west and south at a depth of approximately 8 m, although the southward and westward extension changes in character.