飽和砂土振動液化特性受振動頻率影響試驗研究*
秦朝輝1，鄧檢良1，彭加強2，劉世明2，陳龍珠1
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（1 上海交通大學船舶海洋與建筑工程學院， 上海 200240；2 中國電建華東勘測設計研究院有限公司， 杭州 310014）
［摘要］為研究振動頻率對飽和砂土振動液化特性的影響，采用高頻振動三軸儀對飽和砂土進行不同振動頻率下的振動液化試驗。根據(jù)飽和砂土達到液化所需的振動時間、振動次數(shù)和振動頻率三者間已有關系式，從試驗數(shù)據(jù)出發(fā)，在雙對數(shù)坐標系中擬合出液化時間對數(shù)與振動頻率對數(shù)的線性遞減關系式，避免了曲線擬合中參數(shù)確定的困難。由液化時間振動頻率關系式進一步推導出液化振次振動頻率關系式，在雙對數(shù)坐標系中液化振次對數(shù)與振動頻率對數(shù)表現(xiàn)為線性遞增關系。利用已有文獻試驗數(shù)據(jù)對擬合算式進行了驗證，并對擬合算式中參數(shù)的物理意義進行了闡述，此參數(shù)反映了試樣初始狀態(tài)、試驗條件對飽和砂土的液化時間和液化振次的影響。［關鍵詞］飽和砂土; 振動頻率; 動三軸試驗; 液化時間; 液化振次中圖分類號：TU411.8 文獻標識碼：A 文章編號：1002-848X(2015)19-0076-04
Experimental study on vibration liquefaction properties of saturated sands influenced by vibration frequencyQin Zhaohui1, Deng Jianliang1, Peng Jiaqiang2, Liu Shiming2, Chen Longzhu1(1 School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University，Shanghai 200240, China; 2 Power China Huadong Engineering Corporation Limited, Hangzhou 310014, China)Abstract: In order to study the influence of vibration frequency on the liquefaction properties of saturated sands, using the high-frequency vibration triaxial instruments, vibration liquefaction experiments on saturated sands with different vibration frequencies were carried out. According to the relationship among the vibration time and vibration numbers required for saturated sands to reach the liquefaction and the vibratory frequency, the linear decreasing relationship formula of the logarithm of the liquefied time and the vibratory frequency was obtained in the double logarithmic coordinate system by adopting the experiment data, which avoided the difficulty of the parameter choice in curve fitting. The relationship formula between the liquefied vibration numbers and the vibration frequency was further concluded based on the relationship formula between the liquefied time and the vibration frequency, the logarithm of the liquefied vibration numbers and the vibratory frequency is linear increasing in the double logarithmic coordinate system. The fitting formula was verified by existing experimental data in the literature, the physical meanings of the parameters in fitting formula were expounded, which reflected the influence of the initial state of samples and the test conditions on the time and vibration numbers required for saturated sands to reach the liquefaction.Keywords:saturated sand; vibration frequency; dynamic triaxial test; liquefied time; liquefied vibration number
*國家自然科學基金資助項目（51428901，50779034）。作者簡介：秦朝輝，博士研究生，Email:qinzhaohui@sjtu.edu.cn。
