【摘要】 圆梁山隧道穿越由碳酸盐岩构成且地质情况十分复杂的毛坝向斜。应用物探方法,进行了超前地质预报的研究。结果表明:在灰岩地区深埋长大隧道做物探超前地质预报,最好先开展可控源音频大地电磁法勘探,查明各种构造、岩溶发育区、油汽囊等的位置、形状、规模和埋深,对地质情况有一个半定量认识,然后在开挖的掌子面附近开展负视速度地震反射波法,精确预报掌子面前方的不良地质。更多还原

【Abstract】 Yanliangshan tunnel is a key engineering site in Chongqing to Huaihua Railway. The tunnel passes through the Maoba syncline formed by carbonate rocks with very complex geological setting.The author conducted the applied research of more than one geophysical exploration methods in the tunnel and reached some conclusions. In geological beforehand forecast in the relatively deeply buried and long tunnel of carbonate rocks, we should first carry out controllable audio-frequency terrestrial electromagnetic exploration to find out positions, shapes, sizes and burial depths of various structures, karst areas and oil-gas reservoirs so as to get semi-quantitative understanding of the geological background. On such a basis, the negative visual velocity seismic reflection method should be used near the mined face so as to exactly detect unfavorable geological conditions in front of the face.更多还原