盾构近接楼顶加高塔式高层建筑物安全影响数值分析
|
摘要
盾构施工导致高层建筑及其周围地表的沉降的研究和控制是隧道工程领域遇到的重要课题之一,为研究盾构近接高层建筑时造成的影响,基于西安地铁2号线某盾构隧道侧穿高层建筑泛美大厦的工程实例,建立有限元模型对盾构推进过程中楼体应力应变、地表沉降及桩基础形变进行了分析,研究了地铁盾构对高楼顶加钢塔结构体系的影响。结果表明:楼体最大沉降为15.46mm,差异沉降值为7.32mm,倾斜率为0.001,各项指标均小于规范要求的允许值;塔荷载的存在,楼柱所受轴力和弯矩尤其是底部部分大幅增加,加剧了楼体不均匀沉降的程度和倾斜度。盾构施工过程中高层建筑自重导致建筑的地基沉降较大,对于地层的扰动,使楼柱底部和桩的上部产生较大的应力和应变,可见桩柱的连接处,也是盾构过程中高层建筑的一个易损点,影响结构整体的稳定性。桩基础沉降规律与楼体沉降规律不一致,易导致建筑物出现裂缝、倾斜等不利影响,盾构过程中,不仅仅可以通过减少盾构对于地层的扰动,同时也可以对楼柱和桩的连接部位进行人工加固,以此提高高层建筑的稳定性。
Study and control the settlement of high-rise buildings and the surrounding surface caused by shield construction is one of the important problems in the field of tunnel engineering.In order to study the effect of shield proximity caused by high-rise buildings,based on the Xi'an Subway Line No.2 tunnel side wear of high-rise building Pan Am Building project,the finite element model is established to analyze stress and strain,surface subsidence and deformation of the pile foundation during the tunneling advancement process,and the effect of subway shield on the top of a tall building with steel structure system is studied.The results show that the maximum settlement of building is 15.46 mm,the differential settlement value is 7.32 mm and the tilt rate is 0.001,and all indicators are lower than the allowable values stipulated in the specifications;with the tower load,the axial force and bending moment of building columns especially at the bottom part increase significantly,which exacerbates the uneven settlement of the building body and the degree of inclination.In the process of shielding,the self-weight of high building lead to larger settlement of building foundation,and ground disturbance produce greater stress and strain at the bottom of columns and upper of piles,which indicate that the junctions of pile and columns are vulnerable points of high-rise building in the process of shield and influence the stability of the whole structure.Inconsistent settlement rule of the pile foundation with that of buildings can easily lead to adverse effects such as cracks and inclination,during shield process,not only reduce the disturbance to ground during shielding but also artificial reinforcement to the connect parts of the building column and pile can improve the stability of high-rise buildings.
Study and control the settlement of high-rise buildings and the surrounding surface caused by shield construction is one of the important problems in the field of tunnel engineering.In order to study the effect of shield proximity caused by high-rise buildings,based on the Xi'an Subway Line No.2 tunnel side wear of high-rise building Pan Am Building project,the finite element model is established to analyze stress and strain,surface subsidence and deformation of the pile foundation during the tunneling advancement process,and the effect of subway shield on the top of a tall building with steel structure system is studied.The results show that the maximum settlement of building is 15.46 mm,the differential settlement value is 7.32 mm and the tilt rate is 0.001,and all indicators are lower than the allowable values stipulated in the specifications;with the tower load,the axial force and bending moment of building columns especially at the bottom part increase significantly,which exacerbates the uneven settlement of the building body and the degree of inclination.In the process of shielding,the self-weight of high building lead to larger settlement of building foundation,and ground disturbance produce greater stress and strain at the bottom of columns and upper of piles,which indicate that the junctions of pile and columns are vulnerable points of high-rise building in the process of shield and influence the stability of the whole structure.Inconsistent settlement rule of the pile foundation with that of buildings can easily lead to adverse effects such as cracks and inclination,during shield process,not only reduce the disturbance to ground during shielding but also artificial reinforcement to the connect parts of the building column and pile can improve the stability of high-rise buildings.
引文
[1]韩秋石.盾构隧道下穿施工对既有桥梁桩基础的影响及其控制技术研究[D].西安:长安大学,2015.
[2]黄飞.地铁盾构法施工对邻近桩基础的影响分析[D].广州:广州大学,2012.
[3]宋元彬.地铁盾构隧道施工与邻近桩基础的相互影响研究[D].沈阳:东北大学,2014.
[4]郑刚,路平,曹剑然.基于盾构机掘进参数对地表沉降影响敏感度的风险分析[J].岩石力学与工程学报,2015,34(S1):3604-3612.
[5]魏纲,庞思远.双线平行盾构隧道施工引起的三维土体变形研究[J].岩土力学,2014,35(9):2562-2568.
[6]魏纲,裘新谷,魏新江,丁智.邻近建筑物的暗挖隧道施工数值模拟[J].岩土力学,2009,30(2):547-552.
[7]陈敏.隧道施工扰动下邻近管线的位移及其周围土体变形的研究[D].北京:北京交通大学,2008.
[8]汪珂,周慧,侯城,冯志华,赖金星.西安地铁盾构下穿古城墙沉降分析及加固效果[J].解放军理工大学学报:自然科学版,2017,18(3):255-262.
[9]赖金星,秦海洋,樊浩博,宋文鸽,刘厚全.地铁盾构施工对大雁塔影响的数值分析[J].公路,2017,(6):338-344.
[10]刘厚全,赖金星,汪珂,冯志华,向阳.盾构下穿既有群桩基础受力特性数值分析[J].公路,2017,(8):298-304.
[11]张学富,刘佳祥,丁燕平,陈俊涛,余元全.下穿高层建筑特大跨度超大断面偏压隧道施工方法研究[J].铁道学报,2012,34(5):107-113.
[12]杨学嘉.北京典型地铁隧道侧穿建筑物安全性评估方法研究[D].北京:北京工业大学,2012.
[13]陶龙光,刘波,丁城刚,卓发成,赵德刚,李志南.盾构过地铁站施工对地表沉降影响的数值模拟[J].中国矿业大学学报,2003,(3):27-31.
[14]贺美德,刘军,乐贵平,王梦恕,张顶立.盾构隧道近距离侧穿高层建筑的影响研究[J].岩石力学与工程学报,2010,29(3):603-608.
[15]刘波,陶龙光,李希平,唐孟雄.地铁盾构隧道下穿建筑基础诱发地层变形研究[J].地下空间与工程学报,2006,(4):621-626.
[16] GB 50009-2012建筑结构荷载规范[S].
[2]黄飞.地铁盾构法施工对邻近桩基础的影响分析[D].广州:广州大学,2012.
[3]宋元彬.地铁盾构隧道施工与邻近桩基础的相互影响研究[D].沈阳:东北大学,2014.
[4]郑刚,路平,曹剑然.基于盾构机掘进参数对地表沉降影响敏感度的风险分析[J].岩石力学与工程学报,2015,34(S1):3604-3612.
[5]魏纲,庞思远.双线平行盾构隧道施工引起的三维土体变形研究[J].岩土力学,2014,35(9):2562-2568.
[6]魏纲,裘新谷,魏新江,丁智.邻近建筑物的暗挖隧道施工数值模拟[J].岩土力学,2009,30(2):547-552.
[7]陈敏.隧道施工扰动下邻近管线的位移及其周围土体变形的研究[D].北京:北京交通大学,2008.
[8]汪珂,周慧,侯城,冯志华,赖金星.西安地铁盾构下穿古城墙沉降分析及加固效果[J].解放军理工大学学报:自然科学版,2017,18(3):255-262.
[9]赖金星,秦海洋,樊浩博,宋文鸽,刘厚全.地铁盾构施工对大雁塔影响的数值分析[J].公路,2017,(6):338-344.
[10]刘厚全,赖金星,汪珂,冯志华,向阳.盾构下穿既有群桩基础受力特性数值分析[J].公路,2017,(8):298-304.
[11]张学富,刘佳祥,丁燕平,陈俊涛,余元全.下穿高层建筑特大跨度超大断面偏压隧道施工方法研究[J].铁道学报,2012,34(5):107-113.
[12]杨学嘉.北京典型地铁隧道侧穿建筑物安全性评估方法研究[D].北京:北京工业大学,2012.
[13]陶龙光,刘波,丁城刚,卓发成,赵德刚,李志南.盾构过地铁站施工对地表沉降影响的数值模拟[J].中国矿业大学学报,2003,(3):27-31.
[14]贺美德,刘军,乐贵平,王梦恕,张顶立.盾构隧道近距离侧穿高层建筑的影响研究[J].岩石力学与工程学报,2010,29(3):603-608.
[15]刘波,陶龙光,李希平,唐孟雄.地铁盾构隧道下穿建筑基础诱发地层变形研究[J].地下空间与工程学报,2006,(4):621-626.
[16] GB 50009-2012建筑结构荷载规范[S].