川渝红层地区高速铁路路基工程设计探讨

Discussion on Subgrade Design of High-speed Railway in Sichuan-Chongqing Red Layer Area

研究目的:川渝地区是我国红层分布极为广泛的区域,气候水文特征有其独特之处,针对本区域高铁路基工程建设中出现的特殊工程技术问题,结合现场实际工程问题案例情况,需要进行分类研究分析,在勘察设计阶段采取技术可行、经济合理、成熟可靠、符合当地实际的工程技术措施,有效降低本区域高铁路基施工以及运营期间的安全风险。研究结论:(1)在勘察设计阶段,应充分调研路基填料来源,开展详尽的经济技术方案比选,路基填筑应尽量采用价购合格填料的技术方案;(2)在勘察设计阶段,应加强对红层泥岩详细判别,特别要注意膨胀特性的区域微观差别,采取针对性的措施,系统地降低路基上拱病害的风险;(3)根据本区域岩层构造发育情况,采取有针对性的预加固措施,工程现场建设阶段一旦发生不良地质灾害,应采取宁强勿弱的理念,有效降低运营期间的安全风险隐患;(4)本研究成果可为类似地区高铁路基设计提供参考和借鉴。

Research purposes:Sichuan-Chongqing is a region with a wide distribution of red beds in China,and its climate and hydrological characteristics have unique features.In view of the special engineering and technical problems in the construction of high-speed railway subgrade works in the region,combined with practical engineering problems,classified research and analysis,at the design stage,engineering and technical measures that are technically feasible,economically reasonable,mature and reliable and in line with local conditions are taken to effectively reduce the risk of high-speed railway subgrade construction in the region and effectively reduce the potential safety hazards during operation.Research conclusions:(1)In the survey and design stage,the source of subgrade filler should be fully investigated,and a detailed comparison of economic and technical schemes should be carried out.It is suggested that the technical scheme of purchasing qualified filler with reasonable price should be used as far as possible for subgrade filling.(2)In the survey and design stage,the detailed identification of red mudstone should be strengthened,special attention should be paid to the regional micro-difference of swelling characteristics,and targeted measures to systematically reduce the risk of subgrade arch disease should be made.(3)According to the development of rock structure in this area,targeted pre-reinforcement measures are taken at the design stage.In case of adverse geological disasters at the construction stage of the project site,it is recommended to adopt the concept of"better strong rather than weak"to effectively reduce the potential safety risks during the operation period.(4)This paper can provide references for the design of high-speed railway subgrade in the region.