基于广义开尔文模型圆形隧洞围岩衬砌分荷比研究

发布时间：2018-02-06 00:12

本文关键词： 隧洞衬砌分荷比流变　出处：《武汉大学学报(工学版)》2017年04期 　论文类型：期刊论文

【摘要】：基于围岩粘弹性流变模型,研究了围岩衬砌分荷比的确定问题.结合大岗山引水隧洞工程,通过有限元计算,针对围岩符合广义Kelvin模型的圆形隧洞,分析了不同衬砌时间下隧洞与围岩共同承担荷载的规律,提出了分荷比的计算方法;进而计算分析了分荷比随衬砌时间变化的规律;然后分析了分荷比对围岩物理力学参数(主要有弹性模量、粘弹性模量和粘滞系数)、埋深以及隧洞直径等因素变化的敏感性.发现分荷比与弹性模量、粘弹性模量和粘滞系数有着重要联系,而与埋深、隧洞直径大小无关.最后通过数值拟合了分荷比的经验表达式,将其应用到大岗山引水洞,探讨了大岗山引水洞设计计算中合理分荷比的取值问题,成果可为类似工程中衬砌荷载的确定提供参考.
[Abstract]:Based on the viscoelastic rheological model of surrounding rock, the problem of determining the loading ratio of surrounding rock lining is studied. In combination with the Dagangshan diversion tunnel project, the circular tunnel in accordance with the generalized Kelvin model is calculated by finite element method. The law of tunnel and surrounding rock bearing load under different lining time is analyzed, and the calculation method of load distribution ratio is put forward. Furthermore, the law of the distribution ratio with the lining time is calculated and analyzed. Then the sensitivity of the load partition ratio to the physical and mechanical parameters of surrounding rock (mainly elastic modulus, viscoelastic modulus and viscosity coefficient), buried depth and tunnel diameter is analyzed. The viscoelastic modulus and viscosity coefficient have important relation, but have nothing to do with the buried depth and the diameter of the tunnel. Finally, the empirical expression of the loading ratio is fitted numerically, and applied to the Dagangshan diversion tunnel. This paper discusses the value of reasonable load distribution ratio in the design and calculation of Dagangshan diversion tunnel. The results can be used as reference for the determination of lining load in similar projects.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;
【分类号】：TV223

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