公路隧道衬砌厚度不足对衬砌安全性影响
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摘要
针对Ⅲ级和Ⅳ级围岩两种不同的支护形式,建立衬砌厚度不足计算模型。在有无病害条件下,比较隧道衬砌各位置的内力和安全系数,并根据衬砌厚度不足病害程度和宽度,采用数值计算的方法,分析公路隧道衬砌厚度不足对衬砌安全性的影响。分析结果表明:隧道衬砌边墙、拱腰和拱顶的弯矩、剪力和轴力都比较大,属于病害发生的敏感部位;隧道衬砌出现厚度不足病害时,安全系数显著减小;衬砌安全系数随着病害程度的加剧,左边墙呈线性减小,而拱腰和拱顶呈曲线形减小;衬砌安全系数随着病害宽度的增加,先是显著减小,最后又有小幅增长,但整体呈减小趋势;随着病害区域从边墙向拱顶转移,衬砌受影响的范围逐渐增大。
The calculation models of lining thickness lack were set up for surrounding rock Ⅲ and rock Ⅳ. The internal forces and safety factors of tunnel lining at various locations were compared under the conditions of tunnel linings with disease and without disease. Using numerical methods, the effect of lining thickness lack caused by disease extent and range on lining safety were analyzed. Analysis result shows that the values of the bending moments, shears and axial forces at the wall, haunch and vault of lining are large, so these sections are belonging to the sensitive parts to disease. When thickness lack disease appears, the safety factor of tunnel lining significantly reduces. With the increase of disease degree, the safety factor of left wall linearly decreases, but the safety factors of haunch and vault curvily reduce. With the increase of disease width, the safety factor firstly decreases obviously and then increases in small range, but the overall trend is decrescent. With the transfer of disease region from wall to vault, the influenced region of lining increases gradually. 17 figs, 14 refs.
The calculation models of lining thickness lack were set up for surrounding rock Ⅲ and rock Ⅳ. The internal forces and safety factors of tunnel lining at various locations were compared under the conditions of tunnel linings with disease and without disease. Using numerical methods, the effect of lining thickness lack caused by disease extent and range on lining safety were analyzed. Analysis result shows that the values of the bending moments, shears and axial forces at the wall, haunch and vault of lining are large, so these sections are belonging to the sensitive parts to disease. When thickness lack disease appears, the safety factor of tunnel lining significantly reduces. With the increase of disease degree, the safety factor of left wall linearly decreases, but the safety factors of haunch and vault curvily reduce. With the increase of disease width, the safety factor firstly decreases obviously and then increases in small range, but the overall trend is decrescent. With the transfer of disease region from wall to vault, the influenced region of lining increases gradually. 17 figs, 14 refs.
引文
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[2]胡庆安,夏永旭,王文正,等.双连拱隧道施工过程的三维数值模拟[J].长安大学学报:自然科学版,2005,25(1):48-50.HU Qing-an,XI A Yong-xu,WANG Wen-zheng,et al.3-D numerical si mulation on double-arch tunnel s construction process[J].Journal of Chang an University:Natural Science Edition,2005,25(1):48-50.(in Chinese)
[3]赵占厂,谢永利,杨晓华,等.黄土公路隧道衬砌受力特性测试研究[J].中国公路学报,2004,17(1):66-69.ZHAO Zhan-chang,XIE Yong-li,YANG Xiao-hua,et al.Observation research on the mechanical characteristic of highway tunnel lininginloess[J].China Journa1of Highway and Transport,2004,17(1):66-69.(in Chinese)
[4]刘庭金,朱合华,夏才初,等.云南省连拱隧道衬砌开裂和渗漏水调查结果及分析[J].中国公路学报,2004,17(2):64-67.LI U Ting-jin,ZHU He-hua,XI A Cai-chu,et al.Analysis of site investigation of cracking and leakage on arcade tunnel lining of Yunnan Province[J].China Journal of Highway and Transport,2004,17(2):64-67.(in Chinese)
[5]刘庭金,朱合华.偏压连拱隧道病害分析及治理措施[J].中国公路学报,2005,18(4):72-77.LIU Ting-jin,ZHU He-hua.Research on defects of arcadetunnel with partial pressure and its treating measurements[J].China Journal of Highway and Transport,2005,18(4):72-77.(in Chinese)
[6]丁浩,何林生,郑学贵.隧道结构病害处治数值仿真模拟[J].地质与勘探,2003,39(z2):154-157.DI NG Hao,HE Lin-sheng,ZHENG Xue-gui.Numerical si mulation for cure methods of tunnel structure diseases[J].Geology and Prospecting,2003,39(z2):154-157.(in Chinese)
[7]佘健,何川.隧道病害处治解析设计研究[J].西部探矿工程,2004,16(7):100-103.SHE Jian,HE Chuan.Analytical design research on the disease of the tunnel treat ment[J].West-China Exploration Engineering,2004,16(7):100-103.(in Chinese)
[8]李杰.混凝土随机损伤本构关系研究新进展[J].东南大学学报:自然科学版,2002,32(5):750-755.LI Jie.Recent research progress onthe stochastic damage consti-tutional law of concrete[J].Journal of Southeast University:Natural Science Edition,2002,32(5):750-755.(in Chinese)
[9]RICHARDS J A.Inspection maintenance and repair of tunnels:international lessons and practice[J].Tunneling and Underground Space Technology,1998,13(4):369-375.
[10]杨林德,高占学.公路隧道混凝土衬砌结构耐久性设计的研究[J].公路隧道,2002(3):1-7.YANG Lin-de,GAO Zhan-xue.The durability for concrete lining structure of highway tunnel[J].Highway Tunnel,2002(3):1-7.(in Chinese)
[11]BOCK H.European practice in geotechnical instrumentation for tunnel construction control[J].Tunnels and Tunneling International,2001,33(4):51-53.
[12]陈建勋,李建安.公路隧道二次衬砌厚度的优化[J].交通运输工程学报,2006,6(3):68-72.CHENJian-xun,LI Jian-an.Secondary lining thickness opti mi-zation of road tunnel[J].Journal of Traffic and Transpor-tation Engineering,2006,6(3):68-72.(in Chinese)
[13]胡仁东,赵志伟.公路裂缝探测方法[J].长安大学学报:自然科学版,2007,27(1):31-34.HU Ren-dong,ZHAOZhi-wei.Detecting method of highway fractures[J].Journal of Chang an University:Natural Science Edition,2007,27(1):31-34.(in Chinese)
[14]陈建勋,欧阳院平,王明年.公路隧道复合式衬砌结构数值计算及分析[J]中国公路学报,2006,19(2):74-79.CHENJian-xun,OUYANG Yuan-ping,WANG Ming-nian.Numerical computing and analysis of highway tunnel composite lining structure[J].China Journal of Highway and Transoprt,2006,19(2):74-79.(in Chinese)
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