单边扩帮特大跨公路隧道开挖稳定性分析
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摘要
通过现场试验、理论分析及数值模拟计算,对深圳横龙山北隧道右线喇叭口扩帮段的围岩力学参数和动态施工力学进行研究,对扩挖修帮段进行深部位移监测得到反挖修帮造成的拱顶下沉和洞周水平收敛的实测数据,并基于神经网络BP模型反演隧道围岩力学参数。采用有限元软件对横龙山北隧道右线喇叭口扩帮段建立三维有限元模型,分析隧道各开挖阶段对地表沉降的影响以及研究隧道各开挖阶段对隧道拱顶、拱脚和竖墙脚各点应力的影响。
The mechanical parameter of the tunnel's surrounding rocks and dynamic construction mechanics were studied by theories analysis,numerical simulation and field measurement in the broadened segment of the right-way bell-mouth of Henglongshan north tunnel in Shenzhen.The deep displacement of surrounding rocks at broadened segment was monitored so as to acquire the numerical value for the settlement of vault and the horizontal convergence of the tunnel due to one-sided excavation.Based on the BP model of artificial neural network,the mechanical parameter of the tunnel's surrounding rocks was back-analyzed.The finite element software was used to establish a 3-D model of the broadened segment of the right-way bell-mouth of Henglongshan North Tunnel,the effect of each step on the settlement of the earth's surface was analyzed,and the influence of each step on stresses of the tunnel's vault,arch foot and basement were studied.
The mechanical parameter of the tunnel's surrounding rocks and dynamic construction mechanics were studied by theories analysis,numerical simulation and field measurement in the broadened segment of the right-way bell-mouth of Henglongshan north tunnel in Shenzhen.The deep displacement of surrounding rocks at broadened segment was monitored so as to acquire the numerical value for the settlement of vault and the horizontal convergence of the tunnel due to one-sided excavation.Based on the BP model of artificial neural network,the mechanical parameter of the tunnel's surrounding rocks was back-analyzed.The finite element software was used to establish a 3-D model of the broadened segment of the right-way bell-mouth of Henglongshan North Tunnel,the effect of each step on the settlement of the earth's surface was analyzed,and the influence of each step on stresses of the tunnel's vault,arch foot and basement were studied.
引文
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[2]Haack A.Political and social aspects of present and fu-ture tunneling[C]//Tunnels and Underground Struc-tures,Zhao,Shirlaw&Krishnan,ed.Balkema,3-14.
[3]Tuneyoshi Hunasaki Mechanizing and construction resultof world largest diameter tunnel for Trans-Tokyo BayHighway[C]//Proceeding of the world tunnel congressChallenges for the 21st Century.Norway AA Balkema,1999:543-554.
[4]谭光宗.市区浅埋大跨度公路隧道施工技术[J].西部探矿工程,2002,14(5):87-88.TAN Guang-zong.The construction techniques of shal-low-buried and long-span highway tunnel in urban dis-tricts[J].West China Exploration Engineering,2002,14(5):87-88.
[5]高军.曾家坪一号隧道大跨段开挖方法研究[J].现代隧道技术,2002,39(2):38-42.GAO Jun.Study on excavation method of large span tunnel[J].Modern Tunnelling Technology,2002,39(2):38-42.
[6]李立新,石程云.岩土工程位移反分析方法综述[J].沈阳建筑工程学院院报,1996,12(3):354-358.LI Li-xin,SHI Cheng-yun.A reviewof displacementsback analysis methods in geotechnical engineering[J].The Proceedings of Shenyan Architecture Engineering Col-lege,1996,12(3):354-358.
[7]杨志法,王思敬.岩土工程反分析原理及应用[M].北京:地震出版社,2002.YANG Zhi-fa,WANG Si-jing.et.The principles and ap-plication of geotechnical back analysis[M].Beijing:Seismic Press,2002.
[8]吉林,赵启林,冯兆祥,等.岩土工程反分析的研究进展[J].水利水运工程学报,2002(4):57-63.JI Lin,ZHAO Qi-lin,FENG Zhao-xiang.et.Theprogress of fetuin of geotechnical back analysis[J].Hydro-Science and Engineering,2002(4):57-63.
[9]李晓红.隧道新奥法及其量测技术[M].北京:科学出版社,2002.LI Xiao-hong.New Austrian tunnelling method and itsmeasuring techniques[M].Beijing:Science Press,2002.
[10]Karanagh K T,Clough R W.Finite element applicationin the characterization of elastic solids[J].Solids struc-ture Journal,1972,(7):11-23.
[11]Kirsten HA D.Determination of rock mass elastic mod-uli deformation measurement[C]//Proceedings Sympo-sium on by back analysis of Expliration for Rock Engi-neering.Johan-Nesburg,1976:1154-1160.
[12]Maiar G,Jurina,Podolak K.On model identificationproblems in rock mechanics[C]//Proc Symp on theGeotechnics of Structurally Complex Formations.Capri,1977:257-261.
[13]Kovari K et al.Integrated measuring technique for rockoresure determination.In:Proc Int Conf on Field Meas-urements in Rock Mechnics[J].Zurich,1977,(1):533-538.
[14]Sakurai S,Abe S.A design approach to dimensioningunderground opening[C]//Proc 3rd Int Conf NumericalMethods in Geomechanics.Aachen,1979:649-661.
[15]Sakurai,and K.Takcuchi.Back analysis of measureddisplacement of tunnel.Rock Mechanics and Rock engi-neerings[J].1983,16(3):173-180.
[16]Sakurai,N.Dees Wasmongkol,M.Shinji.Back analysisfor determining material characteristics in cut slopes[C]//Proceedings of International Symposium onECRF.Beijing,1986:770-776.
[17]Sakurai S.Interpretation of the results of displacementmeasurements in cut slopes[C]//Proceedings of the2nd International Symposium on Field Measurements inGeomechanics.Kobe,1987:1155-1166.
[18]Maier G,Gioda G.Optimization methods for parametricidentification of geotechnical system[C]//Maitins JBed Numerical Methods in Geomechanics.Boston,1980:431-436.
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