盾构隧道下穿对高铁桥梁稳定性影响分析
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摘要
以深圳地铁某区间盾构隧道下穿广深港高铁桥梁为例,采用三维有限元数值方法模拟了地铁先掘进左线和先掘进右线两种工况,对比分析两种工况下高铁桥墩顶位移。结果表明:受高铁桥下净空限制,在无法施工隔断桩防护的情况下,由于左线隧道覆土厚度较大且距高铁桥梁略远,地铁盾构先掘进左线时高铁桥梁产生的变形值较小,对桥梁稳定性影响较小,且变形满足高铁桥梁变形相关规定,不影响高铁运营安全。该结论对类似工程有一定的借鉴意义。
Taking a shield tunnel in Shenzhen Metro which is under the Guangzhou Shenzhen Hong Kong high-speed railway bridge as an example,the three-dimensional finite element numerical method is used to simulate the two conditions,namely left line heading first and right line heading first,and the comparative analysis is made for the top displacement of the high-speed bridge pier. The results show: owing to the limit of the space of the high-speed rail bridge,the protection of the partition pile can not be constructed,and due to the larger covering thickness and the far distance to bridge,the deformation of high-speed railway bridge is smaller and has less impact on the bridge stability when the first left line of the shield tunnelling which meets the requirements of high-speed railway bridge,and does not affect the operation safety of high-speed railway. The conclusion has some reference significance for similar projects.
Taking a shield tunnel in Shenzhen Metro which is under the Guangzhou Shenzhen Hong Kong high-speed railway bridge as an example,the three-dimensional finite element numerical method is used to simulate the two conditions,namely left line heading first and right line heading first,and the comparative analysis is made for the top displacement of the high-speed bridge pier. The results show: owing to the limit of the space of the high-speed rail bridge,the protection of the partition pile can not be constructed,and due to the larger covering thickness and the far distance to bridge,the deformation of high-speed railway bridge is smaller and has less impact on the bridge stability when the first left line of the shield tunnelling which meets the requirements of high-speed railway bridge,and does not affect the operation safety of high-speed railway. The conclusion has some reference significance for similar projects.
引文
[1]国家发展改革委.关于深圳市城市轨道交通第四期建设规划(2017-2022年)的批复[EB/OL].(2017-07-07)[2018-03-02]. www. ndrc. gov. cn/zcfb/zcfbghwb/201707/t20170712_854375. html.
[2]深圳市发展改革委.深圳市轨道交通第四期建设规划(2017~2022年)[EB/OL].(2017-07-07)[2018-03-02]. www. ndrc. gov. cn/gzdt/201707/t20170712_854377. html.
[3]徐干成,李成学,等.地铁盾构隧道下穿京津城际高速铁路影响分析[J].岩土力学,2009(S2):269-272.
[4]蔡小培,蔡向辉,谭诗宇,等.盾构下穿施工对高速铁路轨道结构的影响研究[J].铁道工程学报,2016(7):11-17.
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[6]彭坤,陶连金,高玉春,等.盾构隧道下穿桥梁引起桩基变位的数值分析[J].地下空间与工程学报,2012(3):485-489.
[7]胡德华,段景川.盾构掘进对邻近桩基的变形特征研究[J].隧道建设,2015(5):413-418.
[8]李雪,周顺华,王培鑫,等.隔离柱及盾构近接施工对高铁桩基的影响分析[J].岩土力学,2015,36(S1):235-239.
[9]柴江明.盾构下穿既有铁路时安全技术措施研究[J].铁道建筑技术,2015(7):46-49.
[10]王成,徐浩,郑颖人.隧道近接桩基的安全系数研究[J].岩土力学,2012(S2):260-264.
[11]李冀伟.地铁隧道盾构下穿对既有隧道的影响研究[D].西安:西安科技大学,2012:62-63.
[12]房明,刘镇,周翠英,等.新建隧道盾构下穿施工对既有隧道影响的三维数值模拟[J].铁道科学与工程学报,2011(1):67-72.
[2]深圳市发展改革委.深圳市轨道交通第四期建设规划(2017~2022年)[EB/OL].(2017-07-07)[2018-03-02]. www. ndrc. gov. cn/gzdt/201707/t20170712_854377. html.
[3]徐干成,李成学,等.地铁盾构隧道下穿京津城际高速铁路影响分析[J].岩土力学,2009(S2):269-272.
[4]蔡小培,蔡向辉,谭诗宇,等.盾构下穿施工对高速铁路轨道结构的影响研究[J].铁道工程学报,2016(7):11-17.
[5]杨林.地铁盾构隧道下穿既有铁路加固方案数值分析[J].铁道建筑技术,2017(3):78-82.
[6]彭坤,陶连金,高玉春,等.盾构隧道下穿桥梁引起桩基变位的数值分析[J].地下空间与工程学报,2012(3):485-489.
[7]胡德华,段景川.盾构掘进对邻近桩基的变形特征研究[J].隧道建设,2015(5):413-418.
[8]李雪,周顺华,王培鑫,等.隔离柱及盾构近接施工对高铁桩基的影响分析[J].岩土力学,2015,36(S1):235-239.
[9]柴江明.盾构下穿既有铁路时安全技术措施研究[J].铁道建筑技术,2015(7):46-49.
[10]王成,徐浩,郑颖人.隧道近接桩基的安全系数研究[J].岩土力学,2012(S2):260-264.
[11]李冀伟.地铁隧道盾构下穿对既有隧道的影响研究[D].西安:西安科技大学,2012:62-63.
[12]房明,刘镇,周翠英,等.新建隧道盾构下穿施工对既有隧道影响的三维数值模拟[J].铁道科学与工程学报,2011(1):67-72.