Influence of freeze-thaw cycles on dynamic characteristics of subgrade soils with different plasticity indices
WANG Jing1, LIU Han-bing2, WU Chun-li2, QU Xiao-long3
1. School of Communication Science & Engineering, Jilin Jianzhu University, Changchun 130118, China; 2. College of Transportation, Jilin University, Changchun 130022, China; 3. Jilin Communications Planning and Design Institute, Changchun 130021, China
Abstract：The specimens with the maximum degree of compaction are prepared. Dynamic triaxial tests are carried out on the specimens under different confining pressures after 0 to 7-time complete freeze-thaw cycles. The test results show that at the initial stage, the dynamic moduli of the soils (including dynamic elastic modulus and dynamic shear modulus) exhibit a downward trend with the increase of the loading cycles. As the number of dynamic loads continues to increase, the dynamic modulus is stable. By taking the average dynamic moduli of 5000 to 6000 loading cycles as the soil dynamic properties in this state, the laws are summarized as follows: the dynamic moduli of the compacted soils in seasonally frozen region increase with the increase of the confining pressure, decrease with the increase of the number of the freeze-thaw cycles, and increase with the increase of the plasticity index. The damping ratio has no obvious rules to follow with the freeze-thaw cycles, confining pressure and plasticity index. The relationship among the dynamic moduli, confining pressure, plasticity index and number of freeze-thaw cycles is obtained though data analysis. It may provide a reference for the embankment design and construction in the seasonally frozen region.
王静, 刘寒冰, 吴春利, 曲肖龙. 冻融循环对不同塑性指数路基土动力特性影响[J]. 岩土工程学报, 2014, 36(4): 633-639.
WANG Jing, LIU Han-bing, WU Chun-li, QU Xiao-long. Influence of freeze-thaw cycles on dynamic characteristics of subgrade soils with different plasticity indices. Chinese J. Geot. Eng., 2014, 36(4): 633-639.
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