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随着我国地铁线路的快速发展,不可避免地会遇到穿越繁忙干线铁路重大风险源施工技术难题。目前世界上针对这类问题的研究较少,没有可参考的工程案例。结合北京地铁10号线下穿京沪高速铁路、京九铁路等重大风险源穿越施工,笔者进行了系统的试验测试分析。结果表明:(1)若采取措施得当,完全可以进行穿越重大风险源施工,但应注意进行各重要结构和部件的精确监测,使施工始终处于安全可控状态;并建议采用自动化监测。(2)线路在穿越时会产生较快的沉降,穿越后沉降即趋于稳定;双线穿越时,后穿越线路会影响先穿越线路;当恢复线路后,穿越影响区还会发生一定的缓慢变形。(3)初步提出了一套路基及接触网杆变形控制指标及标准,以供类似工程参考。此外,本案例的成功实施为我国及世界其他国家进行穿越高速铁路等重大风险源施工积累了宝贵的经验。
With the rapid development of China’s subway lines, it is inevitable that they will encounter technical difficulties in construction of major risk sources for traversing the busy trunk railway. At present, there are few researches on this kind of problems in the world and there is no project case that can be referred to. Combined with Beijing-Shanghai high-speed railway passing through Beijing Metro Line 10 and Beijing-Kowloon Railway and other major risk sources across the construction, the author conducted a systematic test and analysis. The results show that: (1) If proper measures are taken, it is entirely possible to carry out construction through major risk sources; however, careful monitoring of important structures and components should be taken into consideration so that the construction will always be in a safe and controllable condition; and automatic monitoring is suggested. (2) The line will have a faster settlement when it traverses. After settlement, the settlement will tend to be stable. When it crosses the line, it will affect the first crossing the line after passing through the line. When the line is restored, it will take some time to pass through the affected area Deformation. (3) Preliminarily put forward a set of indicators and standards for deformation control of roadbed and contact net for reference of similar projects. In addition, the successful implementation of this case has accumulated valuable experience for China and other countries in the world in construction of major risk sources such as high-speed railways.