黄土地层地铁长大区间初步设计阶段增设车站线站位及施工方法比选
周丁恒1朱振烈1高生苗1侯春山1刘健1邹永祥2
Track Alignment and Construction Method Comparison for Adding Stations to Long Metro Intervals in Loess Strata during Preliminary Design Stage
ZHOU Dingheng1ZHU Zhenlie1GAO Shengmiao1HOU Chunshan1LIU Jian1ZOU Yongxiang2
-
作者信息:1.中铁第五勘察设计院集团有限公司， 102600， 北京
2.北京市市政工程设计研究总院有限公司， 100082， 北京
-
Affiliation:1.China Railway Fifth Survey and Design Institute Group Co., Ltd., 102600, Beijing, China
2.Beijing General Municipal Engineering Design & Research Institute Co., Ltd., 100082, Beijing, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.20230575
-
中图分类号/CLCN:U231.4
-
栏目/Col:土建工程
摘要:
［目的］为优化黄土地层地铁长大区间增设车站的线站位与施工工法，需开展经济性、安全性比选研究。［方法］以西安地铁15号线航天城站—东长安街站区间为背景，分析了地铁长大区间增设车站的影响因素，对增设车站的平面位置、纵断面进行了优化比选；在对比明挖法、暗挖法，以及明挖法+暗挖法等8种施工方法的基础上，从车站规模、使用功能、工程造价、施工风险等方面对比了地下三层全PBA (洞桩逆作) 法和地下一、二层明挖法+地下三层CRD（交叉中隔壁）法方案，确定了最优施工方法；对新增车站进行了E3地震作用下的三维时程分析。［结果及结论］地铁长大区间增设车站需综合考虑两端车站、道路规划、风险源等因素，以确定线站位；采用PBA法施工深埋车站时地基承载力难以满足要求，推荐采用地下一、二层明挖法+地下三层CRD（交叉中隔壁）法结合的施工方法；深埋站厅与站台分离车站在E3地震作用下，结构变形率在规定范围内，但局部区域安全度较低，需采取加强构造措施。
Abstracts:
［Objective］ To optimize the track-station alignment and construction methods for adding metro stations to long metro intervals in loess strata, a comparative study on economic efficiency and safety is required. ［Method］ An interval between Hangtiancheng Station and Dongchang’anjie Station on Xi’an Metro Line 15 is taken as the research background, influencing factors related to the additional station in a long metro interval are analyzed, and the horizontal and vertical alignments of the newly added station are optimized and compared. Based on a comparison of eight construction methods including open excavation, mined tunneling, and combinations of open excavation with mined tunneling and so on,two schemes: a three-level underground station using the full PBA (pile-beam-arch) method and a combined method of open excavation for the first and second underground levels with CRD (cross diaphragm method) for the third level are further evaluated. A 3D time-history analysis under E3 seismic loading is conducted for the newly added station. ［Result & Conclusion］ The additional station in a long metro interval requires comprehensive consideration of adjacent stations, road planning, and risk sources to determine the optimal track-station alignment. When constructing the PBA method deep-buried stations, the foundation bearing capacity is often insufficient. Therefore, the combination of open excavation for the first and second underground levels and CRD for the third underground level construction method is recommended. For deep-buried stations with separate concourse and platform structures under E3 seismic loading, the structural deformation rate remains within the allowable range; however, certain local areas exhibit low safety margins, necessitating the adoption of structural reinforcement measures.
过刊浏览
资料下载
友情链接