兰州轨道交通2号线下穿黄河的大直径 盾构隧道方案比选
向亮
Comparative Selection of Large-diameter Shield Tunnel Schemes of Lanzhou Rail Transit Line 2 under-crossing the Yellow River
XIANG Liang
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作者信息:中铁第一勘察设计院集团有限公司，710043，西安
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Affiliation:China Railway First Survey and Design Institute Group Co., Ltd., 710043, Xi’an, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.05.007
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
为了降低地铁盾构隧道多次下穿黄河的风险，以兰州轨道交通2号线火星街站—黄河市场站区间盾构下穿黄河的隧道工程为例，提出公轨分建和公轨合建两种大直径盾构隧道方案，以空间限界设计要点为依据，对两种方案的排水、疏散通道和通风排烟等附属结构进行设计，提出了两种大直径盾构隧道方案的内径尺寸和内部附属结构的空间布置方案，并分析了两种方案中衬砌管片的设计方案与施工力学特性。随后，从工期、工程造价、施工风险及使用效应等角度对比分析了公轨分建与公轨合建两种方案，采用层次分析法选出优选方案。研究结果表明：公轨分建方案盾构衬砌管片建议采用内径为10.2 m、厚度为0.50 m、环宽为2.0 m的衬砌管片，施工时千斤顶采用顺序卸载方式；公轨合建方案盾构衬砌管片建议采用内径为13.9 m、厚度为0.65 m、环宽为2.0 m的衬砌管片，施工时千斤顶采用顺序卸载方式；公轨分建方案优于公轨合建方案。
Abstracts:
To reduce the risk in metro shield tunnel frequently crossing under the Yellow River, based on the engineering example of Lanzhou Rail Transit Line 2 shield tunnel under-crossing the Yellow River from Huoxing Street Station to Huanghe Market Station interval, two large-diameter shield schemes of road/rail separate construction and road\|rail joint construction are put forward. Based on the key points of space clearance design, the auxiliary structures of the two schemes are designed, such as drainage, evacuation channel, ventilation and smoke exhaust. The inner diameter and interior auxiliary structure spatial layout of the two large\|diameter shield schemes are given, the design scheme and construction mechanical characteristics of the lining segments in the two schemes are analyzed respectively. After comparing and analyzing the perspectives of construction period, project cost, construction risk and use effect for the two schemes, the optimal one is selected using AHP (analytic hierarchy process). Research results show that: the lining segment with inner diameter of 10.2 m, thickness of 0.50 m and ring width of 2.0 m for the road/rail separate construction scheme is recommended, and the jack is unloaded sequentially during construction; the lining segment with inner diameter of 13.9 m, thickness of 0.65 m and ring width of 2.0 m for the road-rail joint construction scheme is recommended, and the jack is unloaded sequentially during construction. The road/rail separate construction scheme is better than the road\|rail joint construction one.
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