【摘要】 受两条区域断层交汇以及岩浆侵入形成较厚隔水岩墙的影响,岭脚隧道左线掌子面FK18+330前方可能赋存多种不良地质体。文章针对这种极为复杂的地质条件,在地质分析的基础上进行了隧道宏观地质预报,洞内采用陆地声纳法+瞬变电磁法+地质雷达法、洞外采用陆地声纳法+微分电测法+瞬变电磁法进行了现场探测,并进行了综合分析和预报。现场开挖结果表明,上述综合预报方法可有效减小现场物探在隧道轴向和横向上的误差,能更好地确定复杂地质条件下隧道前方不良地质体的位置、大小和类型。更多还原

【Abstract】 Affected by the intersection of two regional faults and a water-resistant rock wall induced by magmatic intrusion, various unfavorable geological bodies may exist in front of the working face at FK18+330 on the left line of the Lingjiao tunnel. In light of these complicated geological conditions, a macroscopic tunnel geological prediction was first conducted on the basis of geological analysis, and then an in-situ geological detection was conducted inside and outside of the tunnel by the following methods respectively: land sonar +transient electromagnetic+geological radar and land sonar+differential electrical sounding+transient electromagnetic. Additionally,a comprehensive analysis and prediction was carried out, with the in-situ excavation results showing that the above comprehensive prediction method can effectively reduce the error of in-situ geophysical prospecting in the tunnel’s axial and transverse directions as well as precisely determine the location, size and type of the unfavorable geological bodies in front of the tunnel face under complicated geological conditions.更多还原