砂土路用动态特性试验研究

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Abstract To investigate the dynamic characteristics of sand for highway subgrade under repeated loads，a series of dynamic triaxial tests were carried out. According to the changing rule of accumulative plastic strain with loading cycles，the critical dynamic stress of sand under different compaction degrees and water contents were obtained. The experimental results demonstrate that dynamic resilient modulus values of sand increase with the increase of confining pressure and compaction degree，but decrease with deviatonic stress and water content. The dynamic resilient modulus constitutive model，which reflects the effects of bulk stress and deviatonic stress，was utilized for regression analysis of experimental data. A large coefficient of determination shows that the model is accurate and credible. The prediction model can provide parameters for pavement design based on dynamic method. In order to evaluate subgrade filling according to the above mentioned dynamic characteristics，the design principles for highway subgrade were put forward based on the dynamic characteristics of sand.

Key words： soil mechanics sand dynamic triaxial tests critical dynamic stress dynamic resilient modulus prediction model

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	Articles by authors
	DONG Cheng1
	2
	LI Zhiyong2
	YUE Zhiping2
	LENG Wuming1

Cite this article:

DONG Cheng1,2,LI Zhiyong2, et al. EXPERIMENTAL STUDY OF DYNAMIC CHARACTERISTICS OF SAND FOR HIGHWAY SUBGRADE[J]. , 2012, 31(S1): 3407-3412.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/3407

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