根据不同流型讨论了等面积圆环法确定断面平均流速时所产生的误差。
The error caused by the ring method of equivalent area to measure the mean velocity of the circular pipe is studied by the different now pattern.
自由变形圆环法作为盾构隧道管片衬砌设计的传统方法，其计算结果虽安全但偏于保守。
As a traditional method of shield tunnel segment designing, the free displacement ring method is safe but conservative.
分别用平板法及圆环法测试研究了不同代砂率的橡胶砂浆在塑性阶段及硬化早期阶段的收缩开裂性能。
Properties of anti-cracking of rubberized mortar were studied at plastic stage and hard stage by the method of board and ring devices respectively.
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