CZ铁路折多山越岭段“空天地”一体化地质选线

The Application of the Geological Line Selection Method of“Air-space-ground”in the Zheduo Mountain Area of CZ Railway

研究目的:CZ铁路折多山地区穿越举世闻名的鲜水河断裂带,孕育高烈度地震与活动断裂、高位崩滑流灾害链、高陡岸坡稳定性、高地应力、高温热害、高压突涌水"六高工程地质问题",铁路规划面临地质信息获取困难、线路定线困难"两道难题"。本文从地质勘察技术、地质选线技术、地质选线原则三个方面对折多山越岭方案进行总结研究,优选最佳方案。研究结论:(1)系统采用"空天地"综合勘察手段,可快速、详细查明区内工程地质条件,为方案比选打下良好的基础;(2)创新引入三维物探选线、工程地质分区选线、热红外遥感选线等选线技术提高了选线效率;(3)提炼出适合本地区"六高工程地质问题"的综合选线原则:在"走硬不走软"的总体原则下,以隧道工程减轻"高烈度地震、高位崩滑流灾害链、高陡岸坡稳定性"危害,避开驼峰应力区的基础上以埋深较浅的傍山隧道改善"高地应力"危害,同时尽量拔高线路,在冷水补给区降低"高温热害、高压突涌水"风险;(4)本文研究成果可为复杂艰险山区的铁路选线提供参考。

Research purposes:The Zheduo Mountain area of CZ Railway passes through the world-famous Xianshuihe fault zone,which breeds six high engineering geological problems,such as high intensity earthquake and active fault,high landslide disaster chain,high and steep bank slope stability,high ground stress,high temperature heat damage,and high pressure water inrush.And the railway planning is faced with"two difficulties",such as difficulty in obtaining geological information and difficulty in line alignment.This paper makes a systematic summary of Zheduo Mountain crossing scheme from three aspects:geological survey technology,geological route selection technology and geological route selection principle,and optimizes the best scheme.Research conclusions:(1)The engineering geological conditions can be identified quickly and detailedly with the survey technology of"air-space-ground",which helps to lay a good foundation for line selection.(2)The efficiency of line selection is improved by introducing the innovative line selection technology of aerogeophysical exploration,engineering zoning and thermal infrared remote sensing.(3)The comprehensive line selection principle of M six high engineering geological problems"is summarized:the tunnel location should be selected to reduce the potential risk of"high intensity earthquake,high landslide disaster chain,and high and steep bank slope instability";the mountain side tunnel should be selected to reduce the tunnel depth and decrease the"high ground stress"while avoiding the hump stress area.Meanwhile,the line should rise as much as possible to reduce the"damage of high temperature and innish of high pressure water".And the general principle of choosing"hard area rather than soft area"should be adhered to.(4)The above research results can provide reference for the railway route selection technology in complex and dangerous mountainous areas.