改进电测深法探测山区深埋隧道隐伏构造

Improved electric sounding method for detecting concealed structures in deep-buried tunnels in mountainous areas

隧道上方存在的隐伏构造在施工过程中极易诱发隧道地质灾害。在传统电测深法中引入正交投影法的地形校正技术和多电极一次布极的高供电电压技术,将其用于长大深埋隧道隐伏构造的探测,勘探成果充分反映了隐伏构造的空间展布形态,并与钻探成果表现出较好的一致性。此次研究表明:改进电测深法能有效探测出沿测线剖面地质体电阻率的变化情况,准确识别隐伏构造的规模及位置,为隧道安全施工与隧道地质灾害防治提供了依据。

The concealed structure existing above the tunnel is very likely to induce tunnel geological disasters during construction. This paper introduces terrain correction technology based on orthogonal projection method and high power supply voltage technology with multiple electrodes laid at once into the traditional electrical sounding method to improve it. In addition, the improved electrical sounding method is applied to the detection of the concealed structures of long and deep buried tunnel. The exploration results fully reflect the spatial distribution of concealed structures and show good consistency with the drilling results. This study shows that the improved electrical sounding method can effectively detect the change of resistivity of geological bodies along the survey line profile, and can accurately identify the scale and location of concealed structures, thus providing a basis for tunnel safety construction and tunnel geological disaster prevention.