商州至丹凤段丹江河谷区，地质构造发育、两岸斜坡处滑坡、溜坍等不良地质广泛分布、水文地质条件复杂，第三系地层工程性质差。为研究宁西铁路在商州至丹凤段丹江河谷区线路方案，通过在大面积地质调绘基础上，采用遥感技术与钻探、物探、室内试验相结合的地质综合勘察手段，查明了该区域的地质构造、地层岩性特征、两岸斜坡处滑坡、溜坍等不良地质分布、地下水发育情况等工程地质及水文地质条件，重点对丹江两岸滑坡、溜坍等斜坡稳定性进行了准确的分析评价，同时对第三系地层的工程性质进行了工程适应性综合分析研究，形成了丹江河谷区地质选线的新思路，提出了地质选线的具体原则：线路方案宜尽量少通过斜坡段落，并且宜少以隧道方式通过第三系地层。
In the Danjiang River valley area of Shangzhou-Danfeng section, the geological structure is developed, unfavorable geology such as landslide and slump at the slopes on both sides of the bank is widely distributed, hydrogeological conditions are complex, and the engineering properties of Tertiary strata are poor. In order to study the route scheme of Xi’an-Nanjing Railway in the Danjiang River valley area of Shangzhou-Danfeng section, based on large-area geological mapping, the engineering geological and hydrogeological conditions such as geological structure, stratigraphic lithologic characteristics, unfavorable geological distribution such as landslide and slump at the slopes on both sides of the bank, groundwater development, etc. in the area were found out by using remote sensing technology combined with geological comprehensive investigation methods such as drilling, geophysical exploration and laboratory tests. The stability of slopes on both sides of the Danjiang River, such as landslides and slumps, has been analyzed and evaluated accurately. At the same time, the engineering adaptability of Tertiary strata has been comprehensively analyzed and studied. A new idea of geological route selection in the Danjiang River valley has been formed. The specific principles of geological route selection have been put forward: the route scheme should pass through the slope sections as few as possible, and the Tertiary strata should pass through tunnels as few as possible.
