成贵铁路跨西溪河线路方案比选

Route Scheme Comparison of Chengdu-Guizhou Railway Across the Xixi River

成贵铁路在大方至黔西段需跨越西溪河,西溪河为乌江上游支流,河水面较宽,两岸工程地质条件复杂,岩溶、采空区、暗河等不良地质分布较广。复杂的地形地貌及地质条件造成跨河桥位方案的选择难度较大,同时跨河桥位方案的确定直接影响本段线路方案走向和工程投资。文章在详细分析西溪河沿线地形地貌以及工程地质条件的基础上,结合工程投资、桥位方案选择以及工程风险等因素对西溪河上游桥位方案、中游桥位方案和下游桥位方案进行了方案比选。通过比选认为,西溪河上游桥位方案虽然工程投资略高,但具有工程地质条件好、工程风险小、西溪河大桥跨度小的优点,因此予以推荐。

For Chengdu-Guizhou Railway,it is necessary to be across the Xixi River in Dafang-Qianxi section.Xixi River is an upstream tributary of the Wujiang River.The water surface is wide.On both sides of the bank the engineering geo-logical conditions are complex and widely distributed,including karst,gob and buried rivers,etc..It is difficult to choose the location of bridge across the river under the complex landform and the geological conditions.The determination of the bridge location will directly affect the strike of alignment and engineering investment.Based on the detailed analysis of the topography and engineering geological conditions along the river and combined with project investment,bridge loca-tion selection and project risk,a comparison is made on upstream bridge location scheme,middle bridge location scheme and downstream bridge location scheme.Through scheme comparison,it is thought that the upstream bridge location scheme is characterized by good engineering geological conditions,small engineering risk and small bridge span although the engineering investment is slightly higher.