瞬变电磁法在隧道溃口治理检测中的应用研究  

Application of Transient Electromagnetic Method in Tunnel Collapse Control Detection

作　　者：邢修举 蒋齐平 Xing Xiuju;Jiang Qiping

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《铁道勘察》2018年第6期67-71,共5页Railway Investigation and Surveying

基　　金：国家自然科学基金(NSFC41674133);中煤科工集团西安研究院有限公司青年基金(2018XAYQN11)

摘　　要：为了对在建隧道溃塌区注浆前后围岩变化情况作出直观有效的评价,基于隧道工作面环境条件,设计了定点6个扇面、54个角度,采用多匝中心小回线瞬变电磁法检测技术对工作面前方60 m、洞轴线30 m圆柱体范围围岩的富水情况进行三维立体检测。荆西隧道DK93+691工作面溃塌区的瞬变电磁法检测结果表明:注浆前,溃塌区围岩视电阻率值均在8Ω·m以下;注浆后,同一范围的围岩视电阻率值上升到10Ω·m。多角度,多方向小线圈瞬变电磁探测技术可在隧道工作面实现多方向的由点到面、由面到体的探测,其成果可三维立体显示,使资料更加形象直观,方便对地质体的解读和后期的判别。Based on the environmental conditions of tunnel working face, a multi-turn center small-loop transient electromagnetic detection technology with 6 sectors and 54 angles based on fixed-point was proposed to evaluate the alteration of surrounding rocks intuitively and effectively before and after grouting in tunnel collapse area. This method can be applied to detect the abundant water condition in the surrounding rocks, which locate within the 30 m cylinder around tunnel axis and 60 m-length starting from working taee and The transient electromagnetic detection results of DK93 ＋691 working face in Jing-Xi tunnel collapse show that the apparent resistivity of surrounding rocks in collapse area is under 8 Ω · m before grouting, which rises to 10 Ω· m after grouting. The significantly increased apparent resistivity indicates that the grouting is efficient. The poly-direetional detection from point to surface and from surface to body within the tunnel working face can be realized with the multi-angle and multi-direction small coil transient electromagnetic detection technology. Displayed in a three-dimensional stereo way, the detection results will be more visual, which makes the later analysis anti discrimination of geological bodies more conveniently.

关 键 词：瞬变电磁法 超前地质预报 溃塌区 注浆效果检测 三维立体显示 

分 类 号：U452.1[建筑科学—桥梁与隧道工程]