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| EXPERIMENTAL INVESTIGATIONS ON INFLUENCE OF VIBRATION FREQUENCY TO DYNAMIC PROPERTIES OF SATURATED DENSE SAND UNDER HIGH-FREQUENCY VIBRATION |
| QIN Zhaohui1，DENG Jianliang1，PENG Jiaqiang2，SONG Chunyu1，LIU Shiming2，CHEN Longzhu1 |
(1. School of Naval Architecture，Ocean and Civil Engineering，Shanghai Jiaotong University，Shanghai 200240，China；
2. PowerChina Huadong Engineering Corporation Limited，Hangzhou，Zhejiang 310014，China) |
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Abstract In order to study the dynamic characteristics of high frequency vibratory driving in sand foundations，liquefaction experiments with different vibration frequencies on saturated dense sands were conducted by using the high-frequency cyclic triaxial instrument. The mathematical equations describing the relationship among time (t)，number(NL) and frequency(f ) were derived according to the experimental results. The influence of the frequency on dynamic pore water pressure changed with the time and the number of vibrating cycles was studied. The relationship between the ratio of pore water pressure and the ratio of cycles was obtained in this study and was compared with the model proposed by Seed. The shapes of the curves were found to be affected by the frequency. The vibration frequency had the significant influence on the development of axial strain in the dense sands during the high-frequency cyclic triaxial tests. Before the sands achieved liquefaction，the axial strain was slightly changed with the variation of the frequency under the same number of cycles and at the same time. The change of the frequency had great effect on the relationship between the ratio of axial strain and the ratio of cycles.
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2015, Vol. 34 
