卵砾石层浅埋公路隧道支护方案的优化研究 Optimization design of support scheme for a shallow tunnel in gravel deposits.pdfVIP
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卵砾石层浅埋公路隧道支护方案的优化研究 Optimization design of support scheme for a shallow tunnel in gravel deposits
第41卷第7期 土木工程学报 V01.41No.7
200 CHINACIⅥLENGINEER【NG
8年7月 JOURNAL Jul. 2008
卵砾石层浅埋公路隧道支护方案的优化研究
沈才华1,2 童立元1 刘松玉1
(1.东南大学,江苏南京210096;2.河海大学,江苏南京210098)
摘要:某公路隧道位于特殊残坡积卵砾石层斜坡之中,是一典型的大跨浅埋扁平公路隧道,其支护结构和施工方
案的设计直接影响到隧道的安全性和经济性。采用弹塑性非线性有限元模拟分析了该隧道的开挖和支护全过程。
引入释放系数模拟开挖围岩应力释放时空效应,以最能直观反映开挖围岩松动变形情况的拱顶下沉量为主要控制
目标,对初期支护的施作时机进行优化研究,利用得到的最优施作时机进行初支厚度的优化分析,并对二衬设计
的合理性进行评价。提出卵砾石层斜坡中浅埋大跨扁平公路隧道支护设计和施工的优化方案。采用的考虑开挖过
程的系统优化方法和研究成果可以为类似地质条件下隧道工程的设计与施工提供参考意见。
关键词:卵砾石层;大跨;浅埋;优化
中图分类号:7IfU455.7 文献标识码:A
文章编号:1000.131x(2008)07.0071.05
of schemeforashallowtunnelin
optimizationdesignsupport graVeldeposits
SknC面^m12
乃增£i”娜L1£i址勘呦u1
(1.Southeast 210096,China;2.Hohai 210098,China)
University,Nanjing UniVersity,Nanjing
Abstract:One tunnellocatedin is ofa andanat
8hallow—buried,and
expressway graveldepositsslope large—span
ofthe stlllctureandtheconstlllctionschemeexerts innuencesonthe and
shape.Designsupport important stability
ofthe FEMis tosimulatethe and ofthetunnel.
economy applied excaVatingsupportingprocess
tunnel.E1asto—plastic
The and efI’ectsoftheexcavationonthe rocksaresimulatedwithstressrelease
temporalspatial 8urrounding
coe佑cient.Withthecrown most e虢ctivefactorforexcavationinducedfailure
settlement,thevisually zone,鼬the
main of onthe of the isca玎ied
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