煤渣改良土路基的动弹性模量及临界动应力试验研究

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摘要 The dynamic elasticity modulus and critical dynamic stress of improved soil under different confining pressures and frequencies are investigated by using GDS dynamic triaxial test system to examine the dynamic characteristics of cinder-improved soil as subgrade under medium and low confining pressure. The attenuation model of the dynamic elastic modulus was established to analyze the influence of different confining pressures and loading frequencies on the dynamic modulus. A fuzzy linear regression model based on structural element method was used according to the uncertainty of critical dynamic stress. Results show that the dynamic elastic modulus of soil decreases exponentially with the increase of loading times. The attenuation model can reflect the influence of frequency and confining pressure on the dynamic modulus of elasticity. The critical dynamic stress of soil is negatively correlated with the frequency of loading and is positively correlated with the confining pressure. The fuzzy linear regression model based on the structural element method can reflect the relationship between the critical dynamic stress and the frequency and confining pressure.

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	张向东
	任昆

关键词 ： road engineering, dynamic characteristics, dynamic triaxial test, cinder improved soil, fuzzy structural element

Abstract：The dynamic elasticity modulus and critical dynamic stress of improved soil under different confining pressures and frequencies are investigated by using GDS dynamic triaxial test system to examine the dynamic characteristics of cinder-improved soil as subgrade under medium and low confining pressure. The attenuation model of the dynamic elastic modulus was established to analyze the influence of different confining pressures and loading frequencies on the dynamic modulus. A fuzzy linear regression model based on structural element method was used according to the uncertainty of critical dynamic stress. Results show that the dynamic elastic modulus of soil decreases exponentially with the increase of loading times. The attenuation model can reflect the influence of frequency and confining pressure on the dynamic modulus of elasticity. The critical dynamic stress of soil is negatively correlated with the frequency of loading and is positively correlated with the confining pressure. The fuzzy linear regression model based on the structural element method can reflect the relationship between the critical dynamic stress and the frequency and confining pressure.

Key words： road engineering dynamic characteristics dynamic triaxial test cinder improved soil fuzzy structural element

收稿日期: 2017-12-11

基金资助:Supported by the National Natural Science Foundation of China (No. 50978131), Joint Research Project of Special Research Fund for Doctoral Programs in Colleges and Universities (No. 20112121110004)

通讯作者: ZHANG Xiang-dong E-mail: jwd101@126.com

引用本文:

张向东, 任昆. 煤渣改良土路基的动弹性模量及临界动应力试验研究[J]. Journal of Highway and Transportation Research and Development, 2018, 12(4): 25-32.
ZHANG Xiang-dong, REN Kun. Experimental Study on Dynamic Elastic Modulus and Critical Dynamic Stress of Cinder-improved Soil Subgrade. Journal of Highway and Transportation Research and Development, 2018, 12(4): 25-32.

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