Abstract：In order to study the effect of cyclic loading frequency on the liquefaction characteristics of saturated sand, cyclic torsional shear tests with vibration frequencies of 0.05Hz, 0.1Hz, 0.5Hz, 1Hz and 2Hz were carried out on Fujian standard sand with density of 35%, 50% and 70%, respectively. And the coral sand and fine sand with density of 50% were further tested with the vibration frequencies of 0.1Hz and 1Hz. The experimental results show that the shear dilatancy and shrinkage characteristics of both loose and dense sand are closely related to the loading frequency and the shear dilatancy characteristics of the soil is significant under the low-frequency load. The pore water pressure fluctuates after the initial liquefaction, and the sandy soil still has the ability to resist liquefaction, showing a “hardening” liquefaction mode. Under high frequency load, the soil showed significant shear shrinkage characteristics. The pore water pressure kept stable after the initial liquefaction, and cyclic liquefaction model exhibited “soften” characteristics. The pore water pressure characteristics and liquefaction model of coral sand and fine sand were also affected by the loading frequency. This shows that the loading frequency will influence in the shear dilatancy characteristics of saturated sandy soil and liquefaction model. The flow slip deformation generated in the liquefaction stage was closely related to the loading frequency, and the flow slip deformation under the low-frequency load was significantly larger than that under the high-frequency load.
许成顺 王冰 杜修力 岳冲 杨钰荣. 循环加载频率对砂土液化模式的影响试验研究[J]. 土木工程学报, 2021, 54(11): 109-118.
Xu Chengshun Wang Bing Du Xiuli Yue Chong Yang Yurong. Experimental study on effect of cyclic loading frequency on liquefaction mode of sand. 土木工程学报, 2021, 54(11): 109-118.
