穿越城区连拱隧道合理施工工法研究
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摘要
以重庆市沙坪坝区的站西站东路下穿道工程为依托,深入研究穿越城区连拱隧道的合理施工工法,从沉降、结构、施工、经济性等方面对比台阶法和CD法,并优化CD法的施工工序,确定对沉降变形起控制作用的施工关键工序。结果表明:修建穿越城区的连拱隧道,采用CD法引起的拱顶及地表沉降量、支护结构承受的最大拉压应力及围岩坍塌范围较台阶法大幅减少;优化后的CD法在控制沉降、结构受力、施工组织方面具有综合优势,其在施工中对地表及拱顶沉降起控制作用的关键工序对相应部位的拱顶及地表累计沉降的影响比重均达到10%以上。
Based on the underpass project of the west to east road in Shapingba District of Chongqing City,the paper studies intensively the reasonable construction method of double-arch tunnel through the city.The Beach method and CD method are compared in terms of settlement,structure,construction,economical efficiency and so on,and the later method is optimized and key construction processes for controlling settlement are determined.The results of this study show that:for the construction of doublearch tunnel through the city,the vault settlement and surface subsidence,the maximum tensile stress of the supporting structure and the surrounding rock damage range caused by the CD method are reduced substantially compared with those caused by Beach method;the optimized CD method is superior in terms of settlement control,structure bearing capacity and construction organization,and the effect of key construction processes for controlling vault settlement and surface subsidence is more than 10% on the accumulated settlement of corresponding parts.
Based on the underpass project of the west to east road in Shapingba District of Chongqing City,the paper studies intensively the reasonable construction method of double-arch tunnel through the city.The Beach method and CD method are compared in terms of settlement,structure,construction,economical efficiency and so on,and the later method is optimized and key construction processes for controlling settlement are determined.The results of this study show that:for the construction of doublearch tunnel through the city,the vault settlement and surface subsidence,the maximum tensile stress of the supporting structure and the surrounding rock damage range caused by the CD method are reduced substantially compared with those caused by Beach method;the optimized CD method is superior in terms of settlement control,structure bearing capacity and construction organization,and the effect of key construction processes for controlling vault settlement and surface subsidence is more than 10% on the accumulated settlement of corresponding parts.
引文
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[12]张万斌,李海军,王明年.喷筑隐式异型中墙复合式连拱隧道的设计分析[J].现代隧道技术,2013(12):147-151.
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[14]李海军,张万斌,王明年.隐式中墙连拱隧道平行中隔壁工法设计与分析[J].铁道标准设计,2015(9):118-120.
[15]李海军.隐式中墙连拱隧道对称中隔壁工法设计与分析[J].重庆建筑,2015(6):40-42.
[2]杨建民.谈高速铁路黄土隧道CRD法施工中的几个问题[J].铁道标准设计,2015(10):134-139.
[3]原郭兵,王庆林,孟飞彪,等.砂质黄土大断面隧CRD法施工技术[J].铁道标准设计,2007(S1):102-105.
[4]王晓州,丁维利,王庆林,等.浅埋大断面黄土隧道下穿既有铁路施工技术[J].铁道标准设计,2007(S1):67-70.
[5]孟庆明,杨林浩.函谷关隧道下穿连霍高速公路施工技术[J].铁道标准设计,2007(S1):126-129.
[6]李金华.双连拱隧道施工过程分析及变形监测研究[D].西安:西安科技大学,2007.
[7]雷金山,阳军生,杨峰,等.大跨度偏压连拱隧道现场监测与受力分析[J].铁道科学与工程学报,2010,7(4):31-36.
[8]苏江川.罗汉山双向八车道连拱隧道结构设计研究[J].现代隧道技术,2009(2):22-28.
[9]邬泽,朱恺.双连拱浅埋暗挖隧道下穿高速公路沉降影响分析[J].铁道标准设计,2012(12):74-77.
[10]王亚琼,张国庆,王万平.连拱隧道结构设计与施工技术演变[J].公路,2010(10):254-259.
[11]丁文其,王晓形,李志刚,等.龙山浅埋大跨度连拱隧道施工方案优化分析[J].岩石力学与工程学报,2005(11):4042-4046.
[12]张万斌,李海军,王明年.喷筑隐式异型中墙复合式连拱隧道的设计分析[J].现代隧道技术,2013(12):147-151.
[13]李海军,王明年,张万斌.隐式中墙连拱隧道工法探讨[J].隧道建设,2015(12):1271-1274.
[14]李海军,张万斌,王明年.隐式中墙连拱隧道平行中隔壁工法设计与分析[J].铁道标准设计,2015(9):118-120.
[15]李海军.隐式中墙连拱隧道对称中隔壁工法设计与分析[J].重庆建筑,2015(6):40-42.