水下振动压实块石抛填层技术初探
Preliminary Analysis of Underwater Vibrating Compaction Technology for Scattering-Filling Rubble Stone Layer

传统的水下强夯工艺法实现短时间内死角地夯实块石抛填层,采用水下振动压实的方法对港珠澳大桥工程中水下块石基床进行压实整平,在国内尚属首例。由于工程实例较少,在现场实施前需进行理论分析。本文将块石抛填层和振动压实系统的模型进行简化,并建立振动方程,通过数学推导给出水下振动压实系统对块石抛填层的做功公式。研究结果表明水对振动压实方法做功的削弱作用很小。
At the site of the Hong Kong-Zhuhai-Macao bridge project, the underwater stone bed needed compaction. However, conventional underwater dynamic compaction could not be used to tamp the scattering-filling rubble stone layer with no dead angle over a short period of time. Thus, vibrating compaction technology was used underwater for the first time in China. Owing to the scarcity of engineering examples, theoretical analysis was needed prior to field application. In this study, rubble stone layers and vibration systems were simplified to a mechanical model. The vibration equation was established, and through strict mathematical deduction, the vibration system's work on the rubble stone was obtained. The results show that the weakening effect of water on vibration compaction is very poor.