四川盆地高速铁路勘察工程地质分区研究

Research on the Geological Zoning of High-speed Railway Survey Engineering in Sichuan Basin

研究目的:位于四川盆地的成渝地区正在推进双城经济圈多层次轨道交通的规划建设,四川盆地又被称为“红层盆地”,其特殊的工程地质和水文地质条件给铁路尤其是高速铁路建设带来诸多挑战,本文根据建成和在建的多条四川盆地高速铁路建设面临的主要工程地质问题,以期厘定面向四川盆地高速铁路勘察的工程地质分区。研究结论:(1)基于“区内相似、区际相异”的原则,建立了以区域工程地质条件和主要工程地质问题为影响因子的四川盆地工程地质分区原则;(2)构建了面向四川盆地高速铁路勘察的五大工程地质区,厘清了各大分区周界范围、主要工程地质条件与问题、减灾选线控制因素、勘察重难点等;(3)工程地质分区有利于根据分区特点采取更有效的勘察方法,制定更具有针对性的勘察方案,从源头规避地质风险,实现精准勘察目标;(4)本研究成果对后续四川盆地高速铁路勘察设计工作具有指导意义和推广应用价值。

Research purposes:The Chengdu-Chongqing region,located in the Sichuan Basin,is promoting the large-scale planning and construction of multi-level rail transit in the Shuangcheng Economic Circle.The Sichuan Basin,also known as the"Red Layer Basin",has its unique engineering geological and hydrogeological conditions that pose many challenges to the construction of railways,especially high-speed railways.Based on the main engineering geological problems faced by the construction of multiple high-speed railways in the Sichuan Basin,this paper determined the engineering geological zoning for high-speed railway exploration in the Sichuan Basin.Research conclusions:(1)Based on the principle of"similarity within the region and differences between regions",a principle of engineering geological zoning in the Sichuan Basin was established,with regional engineering geological conditions and major engineering geological problems as influencing factors.(2)This paper constructed five major engineering geological zones for high-speed railway exploration in the Sichuan Basin,clarified the boundaries,main engineering geological conditions and problems of each major zone,control factors for disaster reduction and route selection,and key and difficult exploration points.(3)Engineering geological zoning is conducive to adopting more effective survey methods based on the characteristics of the zoning,developing more targeted survey plans,avoiding geological risks from the source,and achieving precise survey goals.(4)The research results have guidance and promotion prospects for the subsequent survey and design of high-speed railways in the Sichuan Basin.