研究目的:铁路越岭段工程艰巨,且直接影响线路走向、工程投资和施工安全等重大问题,往往有多个方案进行比选.越岭段线路高程大、隧道埋深大、地形地质条件复杂,仅靠大面积区域地质调绘和钻探等地质手段很难查清方案地质问题.如何科学地、合理地发挥物探技术在铁路越岭隧道选线中的作用是我们铁路勘探者一直在思考的问题,本文以集通线越岭段勘探为例,研究物探技术在铁路隧道选线所发挥的作用.研究结论:物探技术能够查明隧道断层等不良地质构造、岩性分界、地下水发育情况,为隧道围岩分级提供依据；科学指导钻孔布设并大量减少钻探数量；大大地降低勘测成本,缩短勘测周期,提高勘测质量.物探技术在铁路越岭隧道选线中作用凸显.%Research purposes; The construction of railway watershed tunnel is a tough work with several schemes for selection and it is crucial to the railway alignment, construction investment and construction security. As in the watershed section, the track elevation is high, the tunnel is deep buried and the topographical and geological conditions are complicated, only adoption of the regional mapping and boring in large area is difficult to clearly know the geological conditions. How to scientifically and seasonably bring the geophysical prospecting into play in the route selection of railway watershed tunnel is the question facing to the railway prospector. Taking the geological prospecting for the watershed tunnel of Jining - Tonghua Railway as an example, this paper studies the role of geophysical prospecting in the route selection of railway tunnel.Research conclusions: By using the geophysical prospecting, the unfavorable geological structure of fault, the lithologic delimitation and the development of underground water can be clearly found out and it can provide the basis for grading the surrounding rock of the tunnel. The scientific arrangement of boring and reduction of boring quantities can much cut the prospecting cost, shorten the prospecting period and enhance the survey quality. So the geophysical prospecting can play great role in the route selection of the watershed tunnel.
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