综合勘察在石流坡地区线路方案选择中的应用

Application of Integrated Survey for Route Selection in Rock Glacier Side Zone

研究目的:通过采用综合勘察准确地查明石流坡的分类、分布范围、分布厚度、地质成因、稳定程度等,评价其对铁路工程的影响,为线路安全通过岩堆提出解决方案。研究结论:(1)岩堆的组成成分为岩块、岩屑,粒径很大;岩块之间空隙较大,级配不良,在重力和地下水的作用下缓慢移动,危及铁路安全。(2)石流坡空隙中充填大量的细粒土,并长满灌木和乔木,是比较稳定的。通过综合勘察,查明隧道绕避方案中通过岩堆地区的隧道围岩条件较好,有利于线路通过。(3)经过技术经济比选,隧道绕避方案优于路基方案,最终选择隧道绕避方案。

Research purposes ：The rock glacier side＇s sort, distribution range, distribution thickness, geological cause and stability ere are made clear by making integrated survey and on which the influence on railway construction is evaluated for the purpose of presenting the resolution to the railway crossing talus area. Research conclusions ： （ 1 ） The talus compose of blocks and detritus and grain size is highly large. The porosity is very large and the gradation is poor. By gravity and groundwater, it takes on active tide and it is threaten to railway engineering. （2）Rock glacier side is steady that its lacunae is infilled by mass fine particle soil and frutex and arbor grows on it. By integrated survey, we made certain that surrounding rock quality of tunnels through rock pile zone is good and it is favorable to railway. （3） Via selection of technic and economy , the tunnel scheme is better than subgrade scheme and we select tunnel scheme finally.