深切峡谷复杂地质地区大型桥梁工程勘察案例分析

Case Study on Investigation of Large Bridge Engineering in Deep-cutting Gorge Region with Complex Geological Conditions

大型桥梁工程在西南山区铁路建设中往往是关键控制性工程,桥梁工程方案中桥址地质的稳定,直接关系线路方案的可行性。在复杂地质条件下必须坚持"线路服从桥位,桥位服从地质"的选址原则。以林歹至织金(新店)铁路为例,采用地质综合勘探方法,详细查明峡谷区重大工程地质问题,综合比选确定桥址及线路方案,从地形地貌、地层岩性、不良地质、岸坡稳定性等方面对桥梁选址及桥型布置进行分析和评价。

Large bridge engineering generally is the key project controlling railway construction in the mountainous area in the southwest, wherein the stable geology at the bridge site directly relates to the feasibility of the route scheme. Under complex geological conditions, the site selection must always adhere to the principle of ＂route subject to bridge site and bridge site subject to geology＂. In order to Lindai-Zhijin （Xindian） as an example, comprehensive geological investigation was used to explore the major engineering geological issues in the gorge region and, through comparison, the bridge site was selected; at last, from the aspects of landform, formation lithology, unfavorable geology, slope stability, the bridge site selection and bridge type arrangement were analyzed and evaluated.