直立方桩上涌潮压力动态测试及分析研究

Dynamic measurement and study of the bore pressure on a vertical square cylinder in Qian-tang River

本文首先介绍了钱塘江涌潮特性及涌潮压力的现场动态测试,通过对测试数据的分析,揭示了直立方桩上涌潮压力的部分规律。然后采用涌潮冲击力、Morison波浪力及迎流面与背流面静水压力差三者相互叠加的方法计算直立方桩上的涌潮压力。通过计算结果与实测结果对比,基本一致,说明用此半经验半理论公式预测涌潮压力是可行的。最后在实测数据的基础上用此方法反演出方桩的冲击系数Cs,对实际工程中涌潮压力的计算有一定的参考意义。

Following with an introduction to the characteristic of bore pressure in Qian-tang River, the dynamic measurement of the bore pressure on square cylinders was presented. The analysis of the measurement results showed rule of time history and space distribution of bore pressure, then the method predicting the bore pressure was given. Baaed on the method, the bore pressure could be defined as the sum of three forces： the integrated impact force, the force predicted by Morison formula and the force caused by the difference of water levels between the cross and lee sides of square cylinder. The results of numerical calculation compared well with test data, as illustrated that this semi-empirical and semi-theoretical formula for predicting the bore pressure is feasible. In the end, force coefficient C, was conversed from the formula based on the measurement data, which will provide valuable reference for the practice.