城市轨道交通下穿高速铁路线站位方案研究

Study on Station Position Scheme of Urban Rail Transit Undercrossing High-speed Railway Line

城市轨道交通线路接入已运营高铁客运枢纽时,通常存在下穿高速铁路的情况,其研究过程复杂且技术要求高,合理选择轨道交通线站位是方案研究的基础和重点。以西安地铁1号线衔接秦都高铁站为例,结合衔接换乘功能、下穿高铁难度、客流效益、线路技术条件、建(构)筑物影响程度、高铁路基沉降等因素,总结城市轨道交通下穿高速铁路的线站位方案研究思路和方法。通过比较1号线分别沿彩虹二路、咸平路、咸通路衔接秦都高铁站的线站位特点,详细分析了衔接换乘、规划符合性、客流效益、运营条件、施工风险等条件后,推荐沿彩虹二路敷设。该段区间采用盾构法下穿高铁路基,下穿段两端的宝泉路站、秦都站采用地下三层车站;下穿段长672 m,与高铁平面交角约93°;1号线隧道拱顶距高铁CFG桩底约3.235 m;通过Midas GTS-NX三维有限元软件模拟,高铁道床竖向沉降最大值8.68 mm,道床纵向、横向位移分别为0.20,0.44 mm,满足沉降控制要求。

Where an urban rail transit line is connected to the passenger transport hub of a high-speed rail,it usually underpasses the high-speed railway,and the research process is complicated and the technical requirement is high.The reasonable selection of rail transit station is the basis and key point of the project research.Taking Xian Metro Line 1 connecting with Qindu High-speed Railway Station as an example,this paper summarizes the research concepts and methods of the route scheme of urban rail transit connecting with high-speed railway in view of such factors as connecting and transferring function,difficulty of passing under high-speed railway,passenger flow benefit,line technical conditions,influence degree of construction and settlement of high-speed railway subgrade.By comparing the location characteristics of Line 1 connecting with Qindu High-speed Railway station along Xianping Road,Caihong Second Road and Xiandao Road,and analyzing in detail the conditions of connection and transfer,planning compliance,passenger flow benefit,operation conditions and construction risks,laying tracks along Caihong Second Road is recommended.This section adopts shield tunneling method to underpass the high railway subgrade.Baoquan Road station and Qindu station at both ends of the section are underground stations with three floors.The length of the underpass section is 672 m,and the angle of intersection with the HSR plane is about 93°.The vault of line 1 tunnel is about 3.235 m away from the bottom of CFG pile of high-speed railway.Midas GTS-NX three-dimensional finite element software simulation shows that the maximum vertical settlement of high-speed railway bed is 8.68 mm,the longitudinal and transverse displacement of track bed is 0.20 mm and 0.44 mm respectively,meeting the requirements of settlement control.