广深港高铁深港隧道下穿地铁1号线PBCRD工法数值计算研究
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摘要
依据某大断面隧道工程在富水软弱地层中下穿地铁及地下商业街,通过Midas-GTS数值模拟,研究分析先墙后拱交叉中隔壁法(即PBCRD工法)进行近接工程施工的安全性。研究结果表明:该工法能够有效控制位移,保证运营地铁及地下商业街安全,且大断面隧道初期支护、临时支撑与二次衬砌内力在安全范围内。根据分析结果提出施工对策:应采用高压水平旋喷桩改良地层;及时封闭掌子面,并及时施作初期支护;针对桩基侵入新建隧道的情况制定详细的处理方案。采用PBCRD法施工的结构整体性较强,受力转换过程较少,施工空间较大,导洞空间大,二次衬砌工序减少。同时在保证隧道施工安全快速的前提下,也能够保证近接建筑物的安全。
According to a large-section tunnel construction under a metro and underground business street in weak stratum,Midas-GTS numerical simulation is conducted to analyze the safety of the construction with PBCRD method. Research results show that PBCRD method could control displacement and ensure safety of the metro and underground business street, and preliminary support, temporary support and secondary lining of large-sectiontunnel are also safe guarded. Based on simulating results,construction strategies are provided as the followings. High pressure horizontal shot pile should be used to improve the stratum; advance geology forecast and non-blasting excavation should be employed; tunnel face should be closed and preliminary lining constructed in time; detailed scheme should be given in advance for piles penetrating the newly built tunnel. The structure constructed with PBCRD method has good integrity,less stress transformation,sufficient space for construction and pilot tunnel,and less secondary lining procedures. Meanwhile,it ensures the safety of quick tunnel construction and that of the adjacent buildings.
According to a large-section tunnel construction under a metro and underground business street in weak stratum,Midas-GTS numerical simulation is conducted to analyze the safety of the construction with PBCRD method. Research results show that PBCRD method could control displacement and ensure safety of the metro and underground business street, and preliminary support, temporary support and secondary lining of large-sectiontunnel are also safe guarded. Based on simulating results,construction strategies are provided as the followings. High pressure horizontal shot pile should be used to improve the stratum; advance geology forecast and non-blasting excavation should be employed; tunnel face should be closed and preliminary lining constructed in time; detailed scheme should be given in advance for piles penetrating the newly built tunnel. The structure constructed with PBCRD method has good integrity,less stress transformation,sufficient space for construction and pilot tunnel,and less secondary lining procedures. Meanwhile,it ensures the safety of quick tunnel construction and that of the adjacent buildings.
引文
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[2]胡少斌,张立平,边宁宁,等.大跨地铁风道导洞开挖的地表沉降分布规律研究[J].铁道标准设计,2017,61(2):105-109.
[3]黄海斌,周平,陈鹏,等.双线公路隧道下穿铁路隧道不同施工工法理论研究[J].铁道标准设计,2016,60(11):104-109.
[4]王树才,黄治平,安玉波.北京地铁十号线呼家楼车站主体施工方案比选[J].铁道建筑,2006(3):44-46.
[5]雷宏亮.北京地下直径线大断面暗挖隧道衬砌施工技术[J].隧道建设,2013,33(8):684-689.
[6]刘文军.深港隧道下穿运营地铁和商业街地层沉降控制技术[J].铁道标准设计,2016,60(1):98-102.
[7]贺彦卫.苏州街站后停车线区间横通道施工工法[J].铁道建筑,2016(5):112-115.
[8]瞿万波,刘新荣,黄瑞金,等.浅埋暗挖地铁车站施工方案模糊优选[J].铁道建筑,2012(9):54-57.
[9]李丰果.重庆轨道交通暗挖大跨及重叠隧道施工技术[J].隧道建设,2010,30(5):554-560.
[10]徐向东.广州市轨道交通区庄站南站厅双层三跨联拱隧道设计[J].铁道标准设计,2009(6):99-101.
[11]黄炜.浅埋暗挖法在广州地铁五号线工程中的应用[D].广州:广州大学,2011.
[12]张玉军,刘谊平.上下行隧道立交处围岩稳定性的有限元计算[J].岩土力学,2002,23(4):511-515.
[13]郑余朝,仇文革.重叠隧道结构内力演变的三维弹塑性数值模拟[J].西南交通大学学报,2006,41(3):376-380.
[14]龚伦,仇文革.既有铁路隧道受下穿引水隧洞近接施工影响预测[J].中国铁道科学,2007,28(4):29-33.
[15]Zhao H B,Long Y,Li X H,et al.Experimental and numerical investigation of the effect of blast-induced vibration from adjacent tunnel on existing tunnel[J].KSCE Journal of Civil Engineering,2016,20(1):431-439.
[16]Yoo C.Three dimensional numerical investigation on the effect of bridge construction on existing tunnel[J].KSCE Journal of Civil Engineering,2014,18(3):794-802.