越江盾构隧道纵向结构分析模型的改进及应用
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摘要
在盾构隧道等效刚度连续模型中考虑了环缝影响系数的影响,推导了改进模型的力学计算公式,建立了隧道纵向变形曲率及环缝变形与环缝等效刚度之间的关系.利用该模型对上海某越江隧道进行了工程应用分析.根据盾构隧道临界状态的变形界值,初步建立了越江盾构隧道纵向变形曲率半径与环缝张开量间的关系.计算表明:与地铁盾构隧道相比,越江隧道曲率半径的限值要求可适当放宽.越江隧道纵向变形曲率半径小于1.257km时,环缝张开量大于6mm,环缝密封止水措施失效,隧道会出现严重的渗水漏泥现象.越江隧道螺栓极限应力状态相应的环缝张开量为21.00mm,此时环缝连接破环,不能满足隧道的结构性安全要求.
The equivalent-continuous rigidity model was modified by the introduction of circular seam coefficients for a shield tunnel. The basic assumptions and the formula for the model are given. A relationship between circular-seam deformation and circular-seam equivalent rigidity is developed. Cross-river shield tunnels in Shanghai area were analyzed with the model. Critical deformation values of the shield tunnel were used to build a relationship between longitudinal deformation and circular-seam stretching of the shield tunnel. It is shown that critical curvature radius values of the cross-river shield are smaller than for metro-shield tunnels. A longitudinal deformation radius less than 1.257 kilometers in the cross-river tunnel results in circular-seam stretching of more than 6 mm. Water sealing of the tunnel is not effective and serious leakage may appear with this amount of stretching. If the bolt stresses of the tunnel are limited the circular-seam stretching is 21.00 mm and the connections may be destroyed. The safety requirements of the shield tunnel are not satisfied under these condition.
The equivalent-continuous rigidity model was modified by the introduction of circular seam coefficients for a shield tunnel. The basic assumptions and the formula for the model are given. A relationship between circular-seam deformation and circular-seam equivalent rigidity is developed. Cross-river shield tunnels in Shanghai area were analyzed with the model. Critical deformation values of the shield tunnel were used to build a relationship between longitudinal deformation and circular-seam stretching of the shield tunnel. It is shown that critical curvature radius values of the cross-river shield are smaller than for metro-shield tunnels. A longitudinal deformation radius less than 1.257 kilometers in the cross-river tunnel results in circular-seam stretching of more than 6 mm. Water sealing of the tunnel is not effective and serious leakage may appear with this amount of stretching. If the bolt stresses of the tunnel are limited the circular-seam stretching is 21.00 mm and the connections may be destroyed. The safety requirements of the shield tunnel are not satisfied under these condition.
引文
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[11]田敬学,张庆贺.盾构法隧道的纵向刚度计算方法[J].中国市政工程,2001,(3):35-37.TIAN Jing-xue,ZHANG Qing-he.Calculation of longitudinal rigidity of shield tunnels[J].China Mu-nicipal Engineering,2001,(3):35-37.
[2]林永国,廖少明,刘国彬.地铁隧道纵向变形影响因素的探讨[J].地下空间,2000,20(4):264-267.LIN Yong-guo,LIAO Shao-ming,LI U Guo-bin.A discussion of the factors effecting on longitudinal de-formation of subway tunnel[J].Underground Space,2000,20(4):264-267.
[3]志波由纪夫,川島一彦.シルドトソネルの耐震解析に用いる長手方向覆土剛性の評價法[C]//土木学会論文集.東京:[s.n].,1988:319-327.
[4]志波由纪夫,川島一彦.答変位法によるシルドトソネルの地震时断面力の算定法[C]//土木学会論文集.東京:[s.n].,1988:385-394.
[5]WANG Qi-sheng,LI Xi-bing,ZHAO Guo-yan,et al.Experi ment on mechanical properties of steel fi-ber reinforced concrete and applicationin deep under-ground engineering[J].Journal of China University of Mining&Technology,2008,18(1):64-66.
[6]朱合华,陶履彬.盾构隧道衬砌结构受力分析的梁-弹簧系统模型[J].岩土力学,1998,19(2):26-32.ZHU He-hua,TAO Lv-bin.Study on two beam-spring models for the numerical analysis of segments in shield tunnel[J].Rock and Soil Mechanics,1998,19(2):26-32.
[7]徐凌.软土盾构隧道纵向沉降研究[D].上海:同济大学土木工程学院,2005.
[8]林永国.地铁隧道纵向变形结构性能研究[D].上海:同济大学土木工程学院,2001.
[9]郑永来,韩文星,童琪华,等.软土地铁隧道纵向不均匀沉降导致的管片接头环缝开裂研究[J].岩石力学与工程学报,2005,24(24):4552-4558.ZHENG Yong-lai,HAN Wen-xing,TONG Qi-hua,et al.Study on longitudinal crack of shield tunnel segment joint due to asymmetric settlement in soft soil[J].Chinese Journal of Rock Mechanics and En-gineering,2005,24(24):4552-4558.
[10]温竹茵,周质炎.盾构法隧道的纵向受力分析[J].特种结构,2002,19(2):14-16.WEN Zhu-yin,ZHOUZhi-yan.Mechanical analysis of shield tunnel in longitudinal direction[J].Special Structures,2002,19(2):14-16.
[11]田敬学,张庆贺.盾构法隧道的纵向刚度计算方法[J].中国市政工程,2001,(3):35-37.TIAN Jing-xue,ZHANG Qing-he.Calculation of longitudinal rigidity of shield tunnels[J].China Mu-nicipal Engineering,2001,(3):35-37.
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