隧道爬坡开挖与水平开挖掌子面稳定性对比分析
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摘要
地铁附属结构施工时受场地及工期影响往往采取爬坡开挖方式。为了确定其掌子面的安全状态,文章通过理论分析并结合数值模拟,对比分析了爬坡开挖与水平开挖下掌子面的稳定性。其中,采用极限分析上限法掌子面破坏区假定,对比分析了爬坡开挖与水平开挖的破坏区影响范围及位置;采用数值分析方法,研究了爬坡与水平开挖不同工况下等值应变区的位置和掌子面水平位移变化规律。分析结果表明:隧道爬坡开挖造成的影响区范围略大于水平开挖,影响区位置比水平开挖略低;掌子面0～1/3高度范围内爬坡开挖引起的水平位移比水平开挖略大,掌子面1/3高度以上范围内略小;爬坡与水平开挖下掌子面最大水平位移均位于掌子面1/3高度处,且爬坡开挖下掌子面变形并不大于水平开挖;在不考虑超前支护的情况下,爬坡与水平开挖的掌子面稳定性基本一致,而在选取适宜的超前支护措施前提下,能够保证掌子面的稳定性。
Restricted by site and construction period of ancillary structure of metro project, climbing excavation isoften adopted. In order to determine tunnel face′s stability, the stabilities of working face in the cases of climbing ex-cavation and horizontal excavation were analyzed by theoretical analysis and numerical simulation. With upper-bound limit analysis, the affected scope and positions of failure zone were compared; the position of equivalent strainzone and the law of horizontal displacement changes were studied by simulation analysis. The results show that thescope of failure zone caused by climbing excavation was slightly larger than that by horizontal excavation and the po-sition of affected zone is slightly lower than that by horizontal excavation; the horizontal displacement caused byclimbing excavation within a scope of 0-1/3 height of tunnel face is slightly larger than that by horizontal excavationwhile it is slightly smaller beyond the scope of 0-1/3 height of tunnel face; the maximum horizontal displacements inthe cases of climbing and horizontal excavation both occur at the place where is 1/3 height of work face and the de-formation of work face in the case of climbing excavation is not larger than that of horizontal excavation; the workface stabilities are mostly the same in the cases of climbing and horizontal excavation without regard to advancedsupport, and the work face stability is to be guaranteed with proper advanced support.
Restricted by site and construction period of ancillary structure of metro project, climbing excavation isoften adopted. In order to determine tunnel face′s stability, the stabilities of working face in the cases of climbing ex-cavation and horizontal excavation were analyzed by theoretical analysis and numerical simulation. With upper-bound limit analysis, the affected scope and positions of failure zone were compared; the position of equivalent strainzone and the law of horizontal displacement changes were studied by simulation analysis. The results show that thescope of failure zone caused by climbing excavation was slightly larger than that by horizontal excavation and the po-sition of affected zone is slightly lower than that by horizontal excavation; the horizontal displacement caused byclimbing excavation within a scope of 0-1/3 height of tunnel face is slightly larger than that by horizontal excavationwhile it is slightly smaller beyond the scope of 0-1/3 height of tunnel face; the maximum horizontal displacements inthe cases of climbing and horizontal excavation both occur at the place where is 1/3 height of work face and the de-formation of work face in the case of climbing excavation is not larger than that of horizontal excavation; the workface stabilities are mostly the same in the cases of climbing and horizontal excavation without regard to advancedsupport, and the work face stability is to be guaranteed with proper advanced support.
引文
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[13]黄俊,党发宁,周磊,党康宁,郭婵娟,覃源.关于土体隧道掌子面开挖稳定性的量化探讨[J].岩石力学与工程学报,2016,35(S1),3127-3137.HUANG Jun,DANG Faning,ZHOU Lei,DANG Kangning,GUO Chanjuan,QIN Yuan.The Quantitative Analysis of the Face Stability on Soil Tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3127-3137.
[14]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2003.GUAN Baoshu.Collection of the Key Points for Tunnel Engineering Construction[M].Beijing:China Communications Press,2003.
[2]DIMITRIOS KOLYMBAS.Tunneling and Tunnel Mechanics[M].Germany:Springer-Verlag,2005.
[3]VERMEER.P.A,RUSE.N.Die Stabilit?t der Tunnelortsbrust im Homogenen Baugrund[J].Geotechnik,2001,24(3):186-193.
[4]LECA.E,DOMIEUX.L.Upper and Lower Bound Solutions for the Face Stability of Shallow Circular Tunnels in Frictional Material[J].Giotechnique,1990,40(4):581-606.
[5]李君.盾构开挖面稳定性理论分析与试验研究[D].杭州:浙江大学,2010.LI Jun.Test and Analysis on Stability Theory of Shield Excavation Face[D].Hangzhou:Zhejiang University,2010.
[6]吕玺琳,王浩然,黄茂松.盾构隧道开挖面稳定极限理论研究[J].岩土工程学报,2011,33(1):57-62.LV Xilin,WANG Haoran,HUANG Maosong.Limit Theoretical Study on Face Stability of Shield Tunnels[J].Chinese Journal of Geotechnical Engineering,2011,33(1):57-62.
[7]吕玺琳,王浩然.软土盾构隧道开挖面支护压力极限上限解[J].土木建筑与环境工程,2011,33(2),65-69.LV Xilin,WANG Haoran.Upper Bound Solution of the Limit Support Pressure during Shield Tunneling in Soft Clay[J].Journal of Civil,Architectural&Environmental Engineering,2011,33(2):65-69.
[8]王浩然,黄茂松,吕玺琳,周维祥.考虑渗流影响的盾构隧道开挖面稳定上限分析[J].岩土工程学报,2013,35(9):1696-1704.WANG Haoran,HUANG Maosong,LV Xilin,ZHOU Weixiang.Upper-bound Limit Analysis of Stability of Shield Tunnel Face Considering Seepage[J].Chinese Journal of Geotechnical Engineering,2013,35(9):1696-1704.
[9]赵炼恒,黄阜,孙秋红,项志敏,罗伟.浅埋偏压矩形单洞隧道围岩压力极限上限分析方法[J].中南大学学报(自然科学版),2014,45(9):3093-3103.ZHAO Lianheng,HUANG Fu,SUN Qiuhong,XIANG Zhimin,LUO Wei.Rock Pressure of Unsymmetrical Shallow Rectangular Tunnel Based on Upper Bound Limit Analysis Method[J].Journal of Central South University(Science and Technology),2014,45(9):3093-3103.
[10]梁桥,孙志彬,潘秋景,杨小礼.基于极限平衡与上限法的隧道循环进尺分析[J].中国公路学报,2016,29(4):96-106.LIANG Qiao,SUN Zhibin,PAN Qiujing,YANG Xiaoli.Analysis of Round Length Based on Upper Bound Method and Limit Equilibrium in Tunnel Excavation[J].China Journal of Highway and Transport,2016,29(4):96-106.
[11]ANAGNOSTOU G,KOVARI K.Face Stability Conditions with Earth-Pressure-Balanced Shields[J].Tunnels and Deep Space,1996,11(2):165-172.
[12]雷明锋,彭立敏,施成华,赵丹.迎坡条件下盾构隧道开挖面极限支护力计算与分析[J].岩土工程学报,2012,32(3):488-492.LEI Mingfeng,PENG Limin,SHI Chenghua,ZHAO Dan.Calculation and Analysis of Limit Support Force of Shied Tunnel Excavation Face under Facing-slop Conditions[J].Chinese Journal of Geotechnical Engineering,2012,32(3):488-492.
[13]黄俊,党发宁,周磊,党康宁,郭婵娟,覃源.关于土体隧道掌子面开挖稳定性的量化探讨[J].岩石力学与工程学报,2016,35(S1),3127-3137.HUANG Jun,DANG Faning,ZHOU Lei,DANG Kangning,GUO Chanjuan,QIN Yuan.The Quantitative Analysis of the Face Stability on Soil Tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3127-3137.
[14]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2003.GUAN Baoshu.Collection of the Key Points for Tunnel Engineering Construction[M].Beijing:China Communications Press,2003.