The vibration force and amplitude are the two most important parameters in the analysis of the drivability of compacted sand pile vibration driving.The working amplitude is related to the mechanical equipment capacity and soil properties,while the necessary amplitude is mainly related to soil properties.There are significant differences in the understanding of necessary amplitudes among the existing theories for analyzing the drivability of vibration driven piles.In order to better solve the problem of predicting the necessary amplitude for vibration pile driving,based on the analysis of the drivability of compacted sand piles in the artificial island project of the Hongkong-Zhuhai-Macao Bridge and Tunnel,an acceleration sensor is installed on the sand pile pipe to monitor the entire process of compaction sand pile driving.The amplitude time curve is obtained through quadratic integration.The measured amplitude under various soil conditions is compared and analyzed with commonly used methods such as the Jiandiao Kobe Corporation Law of Japan,the ICE pile driving theory in the United States,and the PTC pile driving theory in France.Based on the measured results,the applicability and advantages and disadvantages of the above vibration pile driving theory are compared and analyzed,and suggestions for the necessary amplitude value method are given.The research results indicate that under the condition of using an electric vibration hammer for pile driving,the necessary amplitude of the Jiandiao Kobe Corporation Law of Japan is larger,the necessary amplitude of the French PTC method is smaller,and the regularity of the necessary amplitude of the American ICE method is in good agreement with the measured results,but the value method is not specific enough.It is recommended to further refine and improve the necessary amplitude values for vibration pile driving based on the ICE law in the United States and engineering experience.
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