桩柱式基础反射波法检测合理激振及拾振位置的分析

Analysis on Rational Location of Vibration Exciting and Picking up for Pile-column Foundation Test Using Low Strain Reflection Wave Method

通过分析桩柱式基础激振后应力波的传播特点,探讨了桩柱式基础反射波法检测激振及拾振的合理位置。通过讨论盖梁顶部竖向激振、桩柱结合部竖向激振、墩柱外壁竖向激振等激振方式在桩柱内形成的应力波特征,提出了合理的激振位置。通过行波分析,讨论了盖梁顶部竖向激振、桩柱结合部竖向激振时,桩柱式基础体系内的信号特点,并提出了合理的拾振位置和拾振方法。

Propagation characteristics of stress wave after vibration exciting in pile-column foundation in a bridge were analyzed and the rational locations of vibration excitation and pick up were discussed.The vibration excitation methods to arise stress wave in pile-eolumn foundations were classified as vertical excitation on the top of bent cap,vertical excitation at the combining section of pile-foundation and vertical excitation on pier column surface,the characteristics of stress wave in each method were analyzed to evaluate the rational location.The signal characteristics of pile-eolumn system were discussed by analyzing the reflection routes of stress wave when vertical excitation on the top of bent cap and vertical excitation at the combining section of pile-foundation,meanwhile the rational location and the method of vibration pick up were proposed.