岩溶区不同围岩加固方案下盾构隧道列车振动荷载响应研究
邹仁高1谢建斌1,2李明卓1魏胜斌1许坤1
Vibration Load Response of Shield Tunnel Trains under Different Surrounding Rock Reinforcement Schemes in Karst Area
ZOU RengaoXIE JianbinLI MingzhuoWEI ShengbinXU Kun
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作者信息:1.云南大学建筑与规划学院， 650500， 昆明
2.昆明军龙岩土工程有限公司， 650021， 昆明
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Affiliation:School of Architecture and Planning, Yunnan University, 650500, Kunming, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.09.028
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中图分类号/CLCN:U458.1
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栏目/Col:研究报告
摘要:
目的：研究岩溶区土岩复合地层中不同围岩加固方案下，地铁盾构隧道在列车运行荷载作用下的动力响应，以评估不同围岩加固的可靠性。方法：基于岩溶专项勘察成果和有限元分析方法，依托岩溶区昆明地铁4号线联大街站—吴家营站区间盾构隧道，建立相应岩溶区土岩复合地层地铁盾构隧道的有限元模型，分析隧道运营100年后的累计沉降。结果及结论：各围岩加固方案均可减少列车动力荷载作用下地铁盾构隧道的位移、应力和加速度，其中采用洞外围岩全断面注浆加固方案的效果最好；采用隧道两侧注浆加固围岩时，隧道运营100年后的沉降不满足不均匀沉降要求；为保证岩溶区土岩复合地层地铁盾构隧道的安全运营，应选择在地铁盾构隧道外侧全断面注浆加固隧道围岩。
Abstracts:
Objective: It is aimed to study the dynamics response of metro shield tunnel under train operation load when different surrounding rock reinforcement schemes are adopted for soilrock composite strata of Karst areas, and to evaluate the reliability of different surrounding rock reinforcement. Method: Based on the results of Karstspecific field investigations and finite element (FE) analysis, taking the Liandajie Sta.Wujiaying Sta. shield tunnel interval of Kunming Metro Line 4 built in Karst area, a FE model is established corresponding to metro shield tunnel in soilrock composite strata od Karst areas. The cumulative settlement of the tunnel after 100 years of operation is analyzed. Result & Conclusion: All the surrounding rock reinforcement schemes can reduce the displacement, stress and acceleration of the metro shield tunnel under train dynamic load, among which the external surrounding rock wholesection grouting reinforcement scheme performs the best. When the surrounding rock is reinforced by grouting on both sides of the tunnel, the tunnel settlement after 100 years of operation may not meet the requirements of uniform settlement. To ensure the safe operation of metro shield tunnels in soilrock composite strata of Karst areas, the reinforcement scheme of fullsection grouting on the outer side of metro shield tunnel is recommended.Key wordsmetro; shield tunnel; surrounding rock reinforcement; dynamics response; train load; longterm settlement
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