论文部分内容阅读
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。
The effective water-proof design of reinforced concrete structure is the key of the bright-cut section of large-scale shield tunnel. Taking the Zhuhai Three-Channel South Line Project as a background, the temperature effect of hydration heat in the equivalent age of concrete was analyzed and a three-dimensional model was established. By using the extended finite element method (XFEM), a new reactive butyl rubber The influence of steel plate water stop and traditional steel plate water stop on the crack propagation, and the working status of different waterproof systems are evaluated. The results show that the new type of reactive butyl rubber water stop has better control effect on the crack propagation than the traditional steel water stop. Considering the effect of temperature change, the crack width of the crack increases obviously. However, Tend to balance, crack expansion tends to be stable. In addition, according to the analysis of the crack propagation under the partial loss rate of different sections, the width of the crack development increases with the increase of the partial loss rate of the section. Therefore, on the basis of considering the waterproof effect, Caused by the section of the loss rate.