Abstract
To research the unconsolidated undrained shear strength and deformation properties of saturated cotton fiber reinforced soil, the shear strength of saturated fiber reinforced soil is studied through a series of unconsolidated undrained shear tests. The test results show that the stress–strain relationship of the fiber reinforced soil is strain hardening, and the failure mode of the samples is bulging failure. Tensile properties of fibers require a certain strain to be “mobilized”. When the strain is less, the fiber content and the fiber length have less influence on the principal stress difference, and the reinforcement effect is weak. The reinforcement effect enhances with the increasing of axial strain. The unconsolidated undrained shear strength of saturated fiber reinforced soil increases first and then decreases with the increasing of fiber content and fiber length. The strength is the best under the condition of 1.0% fiber content and 3.09 cm fiber length, and the strength of fiber reinforced soil increases by 63.5% compared with that of unreinforced soil. Fiber reinforcement can weaken the end effect of the samples, and effectively constrain the radial deformation of the soil. By analyzing the interaction modes between the fibers and the soil particles, it is found that the interaction modes are contact, bending and interweaving. These three actions provide the interfacial shear stress between the fibers and the soil particles, and the tensile stress of fibers to restrict the movement of soil particles, and the interactions improve the shear strength of soil.
Similar content being viewed by others
References
Ang EC, Loehr JE (2003) Specimen size effects for fiber-reinforced silty clay in unconfined compression. Geotech Test J 26(2):191–200
Chaduvul U, Viswanadham BVS, Kodikara J (2017) A study on desiccation cracking behavior of polyester fiber-reinforced expansive clay. Appl Clay Sci 142(2):163–172
Chai S, Shi Q (2012) Strength and deformation of saline soil reinforced with rice straw. J PLA Univ Sci Technol (Nat Sci Ed) 13(6):646–650
Chen Y, Zhang Q (1995) Research and application of fiber reinforced soil pavement base. China Communications Press, Beijing
Diab AA, Sadek S, Najjar S, Daya MHA (2016) Undrained shear strength characteristics of compacted clay reinforced with natural hemp fibers. Int J Geotech Eng 10(3):263–270
Diambra A, Ibraim E (2015) Fibre-reinforced sand: interaction at the fibre and grain scale. Géotechnique 65(4):296–308
Gong X (2011) Some problems concerning shear strength of soil in soft clay ground. Chin J Geotech Eng 33(10):1596–1600
Hou T (2012) Influence of expanded polystyrene size on deformation characteristics of light weight soil. J Cent South Univ 19(11):3320–3328
Hou T (2014) Model for compaction density and engineering properties of light weight soil. Chin J Geotech Eng 36(11):2127–2135
Hou T, Xu G (2009) Experiment on triaxial pore water pressure–stress–strain characteristics of foamed particle light weight soil. China J Highw Transp 22(6):10–17
Hou T, Xu G (2010) Experimental study on the shear strength characteristics of foamed particle light weight soil. J China Univ Min Technol 39(4):534–540
Hou T, Xu G (2011) Optimum water content models and tests of light weight soil. Chin J Geotech Eng 33(7):1129–1134
Krishna Rao SV, Nasr Ahmed MA (2012) Laboratory study on the relative performance of silty-sand soils reinforced with linen fiber. Geotech Geol Eng 30(1):63–74
Li G, Chen L, Zheng J, Jie X (1995) Experimental study on fiber reinforced cohesive soil. J Hydraul Eng 6:31–36
Liu J, Hou T, Luo Y (2018) Unconfined compressive strength of synthetic cotton fiber reinforced soil. J Hydroelectr Eng 37(2):12–21
Pamukcu S, Akbulut S (2006) Thermoelastic enhancement of damping of sand using granular synthetic rubber. J Geotech Geoenviron Eng 132(4):501–510
Qu J, Sun Z (2016) Strength behavior of Shanghai clayey soil reinforced with wheat straw fibers. Geotech Geol Eng 34:515–527
Soltani A, Deng A, Taheri A (2018) Swell-compression characteristics of a fiber-reinforced expansive soil. Geotext Geomembr 46(2):183–189
Tang C, Shi B, Gao W, Liu J (2009) Single fiber pull-out test and the determination of critical fiber reinforcement length for fiber reinforced soil. Rock Soil Mech 30(8):2225–2230
Tang C, Li J, Wang D, Wang D, Shi B (2016a) Investigation on the interfacial mechanical behavior of wave-shaped fiber reinforced soil by pullout test. Geotext Geomembr 44(6):872–883
Tang C, Wang D, Cui Y, An L, Li P, Zhao Y (2016b) Tensile strength of fiber-reinforced soil. J Mater Civ Eng 28(7):1–13
Wang D, Tang C, Li J, Liu B, Tang W, Zhu K (2013) Shear strength characteristics of fiber-reinforced unsaturated cohesive soils. Chin J Geotech Eng 35(10):1933–1940
Funding
Project (51509211) supported by National Natural Science Foundation of China; Project (2016M602863) supported by China Postdoctoral Science Foundation; Project (2018031) supported by Excellent Science and Technology Activities Foundation for Returned Overseas Teachers of Shaanxi Province; Project (2015SF260) supported by Social Development Foundation of Shaanxi Province; Project (2017BSHYDZZ50) supported by Postdoctoral Science Foundation of Shaanxi Province; Project (2016GY-01) supported by Yangling District Foundation; Project (Z102021848, Z109021807) supported by the Fundamental Research Funds for the Central Universities; Project (A213021602) supported by International Cooperation Foundation of Northwest A&F University; Project (A213021803) supported by Foreign Cultural and Educational Experts Foundation of Northwest A&F University.
Author information
Authors and Affiliations
Corresponding authors
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Liu, Jl., Hou, Ts., Luo, Ys. et al. Experimental Study on Unconsolidated Undrained Shear Strength Characteristics of Synthetic Cotton Fiber Reinforced Soil. Geotech Geol Eng 38, 1773–1783 (2020). https://doi.org/10.1007/s10706-019-01129-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10706-019-01129-z