【摘要】 岩溶、裂隙及岩石破碎发育带是碳酸盐岩地区隧道施工安全隐患,本文将高分辨率电磁波CT技术成功应用到某隧道已钻孔之间的不良地质现象的勘察,在发射孔中的不同位置上发射高频电磁波,同时在接收孔中测量各发射点发射的电磁波穿透孔间介质后的电磁波射线强度,应用迭代收敛性较好、收敛速度较快的SIRT算法,进行电磁波视吸收系数成像,并结合工程钻探取芯结果,较为准确地推断出了4个孔之间的岩溶、裂隙及岩石破碎发育带分布。更多还原

【Abstract】 Fractures and caverns are the potential hazards to the safe construction and operation of tunnels in the carbonate area.The high resolution of electromagnetic CT has been successfully applied to the detection of such features prior to the construction of a railway tunnel through mountain.We adopt a symmetrical dipole antenna to transmit electromagnetic wave in one borehole and a flagelliform antenna in another borehole as receiver and applied the algorithm SIRT to reconstruct the attenuation coefficient distribution between the boreholes.Combining the results with information from engineering drilling,we were able to deduce precisely the size,shape and spatial distribution of cavities,corrosion fragmentation and rock cranny zones among the four boreholes.The results show that electromagnetic CT is of particular superiority in detecting underground geological hazard bodies in carbonate rock area.更多还原