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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 7    July 2020

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Experimental study of dynamic resilient modulus of subgrade soils under coupling of freeze–thaw cycles and dynamic load
ZHAO Yang(赵阳)1, 2, LU Zheng(卢正)1, 3, YAO Hai-lin(姚海林)1, GU Fan(顾凡)4, 5, DUAN Ya-hui(段亚辉)6

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Hubei Key Laboratory of Geo-Environmental Engineering, Wuhan 430071, China;
4. National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China;
5. National Center for Asphalt Technology, Auburn University, Auburn 36830, USA;
6. School of Urban Construction, Wuchang University of Technology, Wuhan 430023, China

Abstract:Although the dynamic properties of subgrade soils in seasonally frozen areas have already been studied, few researchers have considered the influence of shallow groundwater during the freeze–thaw (F–T) cycles. So a multifunctional F–T cycle system was developed to imitate the groundwater recharge in the subgrade during the freezing process and a large number of dynamic triaxial experiments were conducted after the F–T cycles. Some significant factors including the F–T cycle number, compaction degree, confining pressure, cyclic deviator stress, loading frequency, and water content were investigated for the resilient modulus of soils. The experimental results indicated that the dynamic resilient modulus of the subgrade was negatively correlated with the cyclic deviator stress, F–T cycle number, and initial water content, whereas the degree of compaction, confining pressure, and loading frequency could enhance the resilient modulus. Furthermore, a modified model considering the F–T cycle number and stress state was established to predict the dynamic resilient modulus. The calculated results of this modified model were very close to the experimental results. Consequently, calculation of the resilient modulus for F–T cycles considering the dynamic load was appropriate. This study provides reference for research focusing on F–T cycles with groundwater supply and the dynamic resilient moduli of subgrade soils in seasonally frozen areas.

 

Key words: dynamic resilient modulus; freeze–thaw cycles; dynamic load; dynamic triaxial test; prediction model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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