The strength law of coir fiber-reinforced soil based on modified Duncan-Chang model

被引:5
|
作者
Yang, Hui [1 ,2 ]
Li, Penghui [2 ]
Yang, E. [1 ]
Jiang, Xueliang [1 ,2 ]
Chen, Jiayu [2 ]
机构
[1] Guangzhou Maritime Univ, Sch Civil Engn & Engn Management, Guangzhou, Peoples R China
[2] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha, Peoples R China
基金
中国国家自然科学基金;
关键词
coir fiber-reinforced soil; strength law; elastic modulus; modified Duncan-Chang model; triaxial test; axial strain; COMPRESSIVE STRENGTH; SAND;
D O I
10.3389/feart.2022.1078624
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A large diameter triaxial sample of 61.9 mm was made by adding coir fiber into red clay. The range of confining pressure was 50-200 kPa; fiber content was 0.1%-0.4%; and fiber length was 10-40 mm. By varying the confining pressure, fiber content and fiber length, the unconsolidated and undrained triaxial tests were used to study the shear strength variation law of coir fiber-reinforced soil. The experimental data were processed to establish a linear model of the segmental elastic modulus, and linear analysis was used to determine the model fitting parameters and to improve the Duncan-Chang model by combining the concept of damage ratio. The modified Duncan-Chang model fits the stress-strain relationship of coir-reinforced soil. The results show a clear dividing line for the effect of fiber length and fiber content on the strength of the samples, which is about 30 mm and 0.3%, respectively. At the same time, the modified model can fit the stress-strain relationship of coir fiber-reinforced soil and reflect the stress-strain curve characteristics of coir fiber-reinforced soil.
引用
收藏
页数:10
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