- 摘 要
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(1 北京市軌道交通建設(shè)管理有限公司, 北京 100068; 2 城市軌道交通全自動運行系統(tǒng)與安全監(jiān)控北京市重點實驗室, 北京 100068)
摘要: 以北京地鐵 12 號線大薊區(qū)間下穿 13 號線高架區(qū)間為背景,在風(fēng)險保護(hù)設(shè)計的基礎(chǔ)上,完成了暗挖地鐵隧道下穿地鐵高架區(qū)間三維計算模型的建立,對比分析了不加固、僅洞外加固、洞外加固+橋樁底部加固三種工況下13 號線高架區(qū)間結(jié)構(gòu)豎向位移、水平位移、差異沉降變化特征,并將計算結(jié)果與實測結(jié)果進(jìn)行了對比分析. 研究表明:穿越施工顯著影響范圍約為 4 倍暗挖地鐵隧道跨度;雙線間既有結(jié)構(gòu)受疊加施工影響大于雙線外結(jié)構(gòu),是施工監(jiān)測的關(guān)鍵位置;后施工隧道兩側(cè)承臺差異沉降大于先施工隧道兩側(cè)承臺差異沉降;現(xiàn)場監(jiān)測結(jié)果反映了合理的暗挖隧道設(shè)計和洞內(nèi)外風(fēng)險控制措施是既有地鐵線路保護(hù)的基礎(chǔ).
關(guān)鍵詞: 暗挖地鐵隧道; 地鐵高架區(qū)間; 穿越施工; 加固處理; 位移控制
中圖分類號:TU318+. 1 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)09-0141-06
DOI:10. 19701 / j. jzjg. 20222652
Influence analysis on underground excavation of subway tunnels undercrossing elevated section of existing lines
TANG Xi1,2
(1 Beijing Railway Construction and Management Co. , Ltd. , Beijing 100068, China; 2 Beijing Key Laboratoryof Fully Automatic Operation and Safety Monitoring for Urban Rail Transit, Beijing 100068, China)
Abstract: Taking the background of the section from Dazhongsi Station to Jimenqiao Station of Beijing Metro Line 12undercrossing elevated section of Beijing Metro Line 13, a 3D calculation model was been built for the undergroundexcavation of subway tunnel undercrossing elevated section based on the risk protection design. The change characteristicsof vertical displacement, horizontal displacement and differential settlement of the elevated section structure of Beijing MetroLine 13 under three reinforcement working conditions were compared and analyzed, including non-reinforcement, outsidetunnel reinforcement and outside tunnel reinforcement with bridge pile bottom reinforcement. The calculated results werecompared with the measured results. The research shows that the significant impact range of the undercrossing constructionis about 4 times the span of the underground excavation subway tunnel; the existing structure between the double lines ismore affected by the superposition construction than the structure outside the double line, which is a key position forconstruction monitoring; the differential settlement of the caps on both sides of the tunnel after construction is greater thanthe differential settlement of the caps on both sides of the previously constructed tunnel; the on-site monitoring resultsreflect that reasonable underground excavation tunnel design and risk control measures inside and outside the tunnel are thebasis for the protection of existing subway lines.
Keywords: underground excavation of subway tunnel; elevated section of subway; undercrossing construction;reinforcement treatment; displacement control
作者簡介:唐汐,碩士,高級工程師,主要從事城市軌道交通、項目管理工作,Email:349438318@ qq. com.
[引用本文] 唐汐. 暗挖地鐵隧道下穿既有線高架區(qū)間影響分析[J]. 建筑結(jié)構(gòu),2023,53(9):141-146,152. TANGXi. Influence analysis on underground excavation of subway tunnels undercrossing elevated section of existing lines[ J].Building Structure,2023,53(9):141-146,152.
