摘要
研究目的:新方斗山隧道穿越川东隔挡式褶皱,受地层岩性组合、构造、地形地貌控制,形成独特的岩溶地貌景观和岩溶水循环模式,隧道施工涌突水风险高,对地表环境影响大。通过对方斗山岩溶发育特征研究,选择合理线路穿越位置,以期达到有效降低隧道施工风险和对环境影响的目的。研究结论:(1)方斗山背斜岩溶发育深度一般在150~200 m之间,但是在接触带岩溶发育深度较深;(2)方斗山断层属压性断裂,断层倾角陡,两盘强烈挤压,岩溶不发育;(3)北西翼地下水排泄量大,富水性好;南东翼岩溶发育程度相对较弱、发育深度浅,富水性相对较差;(4)方案选择宜靠近既有隧道,利用降落漏斗,一方面可以降低岩溶水风险,另一方面可以减小地表水疏干范围,降低对环境影响;(5)方斗山背斜属川东平行岭谷区典型隔挡式褶皱,本研究成果对川东隔挡式背斜岩溶区隧道勘察及地质选线具有指导意义。
Research purposes:The New Fangdoushan Tunnel passes through the east Sichuan separated block-type fold,which is influenced and controlled by the combination of stratigraphic lithology,tectonics,topography and geomorphology,and forms a unique karst geomorphological landscape and karst water circulation pattern.The risk of water inrush in tunnel construction is high,which has a great impact on the surface environment.In this paper,through the study of the karst development characteristics of Fangdoushan,this paper adopts a reasonable line crossing location to effectively reduce the risk of tunnel construction and the impact on the environment.Research conclusions:(1)The depth of karst development in the backslope of Fangdoushan is generally in the range of 150~200 m,but the depth of karst development in the contact zone is deeper.(2)The Fangdoushan fault is a compressive fault with steep dip and strong extrusion of the two disks,and karst is not developed.(3)The northwest wing has a large amount of groundwater discharge and is well water-rich.The degree of karst development of the southeast wing is relatively weak,the development depth is shallow,and the water-rich nature is relatively poor.(4)The project should choose to locate close to the existing tunnel and utilize the cone of depression,which can reduce the risk of karst water on one hand,and reduce the scope of surface water draining and the impact on the environment on the other hand.(5)Fangdoushan backslope is a typical separated block-type fold in the parallel ridge and valley area of east Sichuan,and the research results can be a guide for tunnel investigation and geological routing in the block-type backslope karst area of east Sichuan.
作者
徐学渊
高楠
魏昌辛
XU Xueyuan;GAO Nan;Wei Changxin(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)
出处
《铁道工程学报》
EI
CSCD
北大核心
2023年第10期40-44,共5页
Journal of Railway Engineering Society
关键词
岩溶水
铁路选线
发育
碳酸盐岩
非可溶岩
降落漏斗
karst water
railway route selection
development
carbonate rocks
non-soluble rock
cone of depression
