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半敞开式隧道是一种节约、环保的新型隧道,但能否满足隧道火灾时的防排烟要求,需要通过试验来验证,模型试验是解决该问题的一种途径。为保证半敞开式隧道火灾模型试验结果能够有效地应用到原型,根据相似原理,对该模型试验的相似性进行了论证。以某实体隧道为原型,通过理论分析和计算,确定以弗诺德相似准则作为研究隧道火灾烟气的主要相似准则,得到模型率的取值范围为大于1∶15。同时从试验条件和可操作性等方面考虑,选取合适的模型率。最终确定半敞开式隧道火灾模型的缩比例为1∶10。
Semi-open tunnel is a new type of economical and environmentally friendly tunnel. However, whether it can meet the requirements of smoke control in tunnel fires needs to be verified through experiments. Model tests are a way to solve this problem. In order to ensure the semi-open tunnel fire model test results can be effectively applied to the prototype, according to the similarity principle, the similarity of the model test is demonstrated. Taking a solid tunnel as a prototype, the similarity criterion of fenofind was determined as the main similarity criterion of tunnel flue gas by theoretical analysis and calculation. The range of the model rate was obtained as 1:15. At the same time from the test conditions and operability considerations, select the appropriate model rate. Finally determine the semi-open tunnel fire model shrinkage ratio of 1:10.