诱导缝防水体系在水化热作用下的数值模拟研究
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摘要
钢筋混凝土结构有效的防水设计是大型盾构隧道明挖段的重点。以珠海三通道南线工程为背景,分析混凝土等效龄期水化热的温度作用,建立三维模型,应用扩展有限单元法(XFEM)对比分析在考虑热力耦合条件下的新型反应性丁基橡胶钢板止水带和传统钢板止水带对于裂缝扩展的影响,评估不同防水体系的工作状态。结果表明:新型反应性丁基橡胶钢板止水带对于裂缝扩展的控制效果优于传统钢板止水带,考虑温度变化的作用后,结构裂缝开展宽度有明显增大,但随着结构受力逐渐趋于平衡,裂缝扩展也趋于稳定。此外,针对不同截面部分损失率下的裂缝扩展情况进行分析,裂缝开展的宽度均随着截面部分损失率的增大而增大,因此在考虑防水效果的基础上,需控制因埋设防水部材而造成的截面部分损失率。
In the open part of a large shield tunnel,it is a key problem to design an effective waterproof system for the reinforced concrete structures. In the background of the south line of the Third Passage of Zhuhai,the temperature effect of concrete based on equivalent age-hydration degree is analysed. The extended finite element method( XFEM) was employed to investigate the effect of traditional water-stop steel sheets and that of the new type of butyl rubber with water-stop steel sheet on the crack growth of concrete structures under the thermal-mechanical coupled condition. The simulation results show that the new type of butyl rubber is more effective in controlling crack growth than the traditional water-stop steel sheets. Changes of temperature considered, the width of cracks significantly increases and becomes stable as the stress of structures tends to equilibrium. Furthermore,the influence of the partial reduction of area on crack growth is investigated. The width of cracks extends with the increases of partial reduction of area. Therefore,the partial reduction of area induced by embedding waterproof materials must be controlled on the basis of waterproof effectiveness.
In the open part of a large shield tunnel,it is a key problem to design an effective waterproof system for the reinforced concrete structures. In the background of the south line of the Third Passage of Zhuhai,the temperature effect of concrete based on equivalent age-hydration degree is analysed. The extended finite element method( XFEM) was employed to investigate the effect of traditional water-stop steel sheets and that of the new type of butyl rubber with water-stop steel sheet on the crack growth of concrete structures under the thermal-mechanical coupled condition. The simulation results show that the new type of butyl rubber is more effective in controlling crack growth than the traditional water-stop steel sheets. Changes of temperature considered, the width of cracks significantly increases and becomes stable as the stress of structures tends to equilibrium. Furthermore,the influence of the partial reduction of area on crack growth is investigated. The width of cracks extends with the increases of partial reduction of area. Therefore,the partial reduction of area induced by embedding waterproof materials must be controlled on the basis of waterproof effectiveness.
引文
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[2]刘玉莲,王安成.成都某地铁车站防水设计及渗漏治理[J].中国建筑防水,2011(24):25-27,42.
[3]王兵.地下工程钢筋砼侧壁的裂缝成因及抗裂设计[J].江苏建筑,2002(1):49-51.
[4]王文斌,张德思.地下工程混凝土裂缝产生的原因及预防措施[J].西部探矿工程,2005,17(7):191-193.
[5]胡骏,洪晓苗,邵林.地下工程混凝土裂缝预控与防水优化设计[J].中国建筑防水,2013(16):1-6.
[6]王荔平,王宝来,邹存伟.中埋反应性丁基橡胶腻子(钢片式)止水带的技术性能分析[J].地下工程与隧道,2010(1):9-11.
[7]胡骏.日本横滨环线地铁某地下隧道段防水设计[J].中国建筑防水,2006(8):47-49.
[8]李东,潘育耕.混凝土水化热瞬态温度场数值计算过程中的水化放热规律及水化速率问题[J].西安建筑科技大学学报(自然科学版),1999,31(3):75-77.
[9]许文忠.大体积混凝土基础温度裂缝控制施工技术研究[D].上海:同济大学,2007.
[10]周志学.大体积混凝土浇筑温度场的仿真分析[D].长沙:中南大学,2011.
[11]潘席伟.大体积混凝土水化热的温度场和应力场的分析方法研究[D].重庆:重庆交通大学,2014.
[12]吕杨,张社荣,于茂,等.基于XFEM的寒潮作用下水闸开裂性状分析[J].水利水运工程学报,2015(3):95-100.
[13]马跃峰.基于水化度的混凝土温度与应力研究[D].南京:河海大学,2006.
[14]钱宏亮,覃锋,范峰,等.台山核电站反应堆外壳温度场模拟分析[J].建筑结构学报,2014,35(7):115-122.
[15]王培铭,丰曙霞,刘贤萍.水泥水化程度研究方法及其进展[J].建筑材料学报,2005,8(6):646-652.
[16]Bazant Z P,Panula L.Practical prediction of time-dependent deformation of concrete:Part I shrinkage[J].Matériaux Et Construction,1978,11(6):415-424.
[17]Belytschko T,Black T.Elastic crack growth in finite elements with minimal remeshing[J].International Journal for Numerical Methods in Engineering,1999,45(5):601-620.
[18]杨涛,邹道勤.基于XFEM的钢筋混凝土梁开裂数值模拟[J].浙江大学学报(工学版),2013,47(3):495-501.
[19]冯德成,田林,曹鹏.基于扩展有限元方法的路基不均匀沉降纵向裂缝分析[J].工程力学,2011,28(5):149-154.
[20]霍中艳,郑东健.基于扩展有限元法的黏聚性裂缝模型的混凝土梁断裂过程模拟[J].计算机辅助工程,2010,19(4):29-33.
[21]阮滨,陈国兴,王志华.基于扩展有限元法的均质土坝裂纹模拟[J].岩土工程学报,2013,35(增2):49-54.
[22]ComitéEuro-International du Béton.CEB-FIP model code1990:Design code[S].American Society of Civil Engineers,1993.
[23]Liu C,Zhang Z,Regueiro R A.Pile and pile group response to tunnelling using a large diameter slurry shield-Case study in Shanghai[J].Computers and Geotechnics,2014,59:21-43.
[24]杨勇.型钢混凝土粘结滑移基本理论及应用研究[D].西安:西安建筑科技大学,2003.
[25]朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国电力出版社,1999.
[26]胡向东,程烨尔.盾构尾刷冻结法更换的温度场数值分析[J].岩石力学与工程学报,2009,28(增2):3516-3525.