困难山区铁路工程布局设计研究

Research on the Engineering Arrangement Design for Railways in Difficult Mountain Area

研究目的:铁路建设是一项百年工程,尤其是桥隧比重大的山区铁路,各类工程所遇到的地质问题更具复杂性和多样性。因此,对困难山区铁路工程布局设计提出了更高的要求。本文对一条铁路线的桥梁、隧道、路基工程布局设计进行总结,以指导选线和工程处理,力求系统设计最优。研究结论:为了能使困难山区铁路工程建设做到技术可行、经济合理、安全可靠,工程布局设计要纠正"重桥隧、轻路基"的思想,避免出现南昆线、内昆线中桥隧工程布局"偏紧、偏少"的现象,减少"假路基",对可能出现工程病害的高填、深挖及重大不良地质地段,应经桥隧与路基方案综合比选后,考虑经济合理、技术稳妥及安全等因素择优选用,从而降低施工运营风险。

Research purposes ： Railway construction is a project for long - term service. Especially construction of the railway in mountain areas with lots of bridges and tunnels will encounter the more complicated and diversified geological conditions. Therefore, higher requirement is brought out to the engineering arrangement design for railways in mountain areas. This paper sums up the arrangement design of bridge, tunnel and subgrade for one railway for the purpose of providing certain guidance for alignment and engineering treatment so as to optimize the systematic design. Research conclusions： In order to make railway construction in mountain areas technically feasible, economically reasonable, safe and reliable, the engineering arrangement design thoughts of ＂ giving priority to bridges ＆ tunnels engineering rather than subgrade＂ must be corrected, the phenomenon of ＂ concentrated and less＂ arrangement of bridges and tunnels appeared in Nanning- Kunming Railway and Neijiang- Kunming Railway should be avoided, and the ＂ pretend suhgrade＂ should be reduced. To any section featured by high filling, deep excavation or major unfavorable geological conditions that may cause engineering diseases, selection should be made following the comparison of schemes of bridges ＆ tunnels and subgrade comprehensively and taking the factors into account such as rationality in economy, soundness in technology, and safety so as to lower the risk of railway construction and operation.