暗挖地铁隧道下穿既有建筑物沉降变化规律研究
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摘要
依托西安地铁4号线某浅埋暗挖地铁区间隧道下穿既有建筑物工程,采用数值模拟与现场监测相结合的方法进行研究。研究结果表明:在下穿既有建筑物时,CRD(交叉中隔)工法产生的地表及建筑物沉降最小,上下台阶预留核心土法诱发的变形最大,CD(中隔墙)工法位于两者之间,区间隧道下穿既有建筑物宜采用CRD工法进行施工;隧道正穿既有建筑物施工对建筑物竖向沉降影响较大,对差异沉降影响较小,而旁穿时引起的差异沉降较大;采取保护措施后,利用CRD工法进行施工引起的地表以及建筑物沉降均在可控范围内,保证了建筑物的安全。
Based on a tunnel project on Xi ′ an metro Line 4 that crosses under the existing buildings,numerical simulation and the site monitoring are combined for this study. The re-search shows that when metro tunnel crosses under existing buildings,the surface and building settlement caused by the cross diaphragm(CRD) method is the smallest,the deforma-tion caused by the reserved core soil method with upper-lower steps is the largest,while the center diaphragm(CD)method is in the middle of the two methods. Therefore,the interval tunnel crossing under existing buildings should adopt CRD method. The shielding tunnel crossing under existing buildings has the greater impact on the vertical settlement of buildings and the less impact on the differential settlement,while the side crossing project will cause larger differential settlement.After taking protective measures,the surface and building set-tlement caused by CRD method construction is within the con-trollable range,thus the safety of buildings is ensured.
Based on a tunnel project on Xi ′ an metro Line 4 that crosses under the existing buildings,numerical simulation and the site monitoring are combined for this study. The re-search shows that when metro tunnel crosses under existing buildings,the surface and building settlement caused by the cross diaphragm(CRD) method is the smallest,the deforma-tion caused by the reserved core soil method with upper-lower steps is the largest,while the center diaphragm(CD)method is in the middle of the two methods. Therefore,the interval tunnel crossing under existing buildings should adopt CRD method. The shielding tunnel crossing under existing buildings has the greater impact on the vertical settlement of buildings and the less impact on the differential settlement,while the side crossing project will cause larger differential settlement.After taking protective measures,the surface and building set-tlement caused by CRD method construction is within the con-trollable range,thus the safety of buildings is ensured.
引文
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[4]朱才辉,李宁.地铁施工诱发地表最大沉降量估算及规律分析[J].岩石力学与工程学报,2017,36(增刊1):3543.
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[8]刘天宇.超前小导管在隧道工程中的应用及数值模拟[J].土工基础,2013,27(2):67.
[2]周锋.大断面浅埋暗挖隧道施工方法及其稳定性研究[D].西安:西安建筑科技大学,2013.
[3]李金奎,王飞飞,白会人.浅埋暗挖地铁隧道施工地表沉降规律分析[J].武汉工程大学学报,2012,34(10):58.
[4]朱才辉,李宁.地铁施工诱发地表最大沉降量估算及规律分析[J].岩石力学与工程学报,2017,36(增刊1):3543.
[5]陈智慧.大跨隧道下穿建筑物施工方案对比分析及施工技术[J].石家庄铁道大学学报,2015,28(2):50.
[6]覃卫民,赵荣生,王浩,等.浅埋大跨隧道下穿建筑物的安全影响研究[J].岩石力学与工程学报,2010,29(增刊2):3762.
[7]姚海波.大断面隧道浅埋暗挖法下穿既有地铁构筑物施工技术研究[D].北京,北京交通大学,2005.
[8]刘天宇.超前小导管在隧道工程中的应用及数值模拟[J].土工基础,2013,27(2):67.