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Polymers 2018, 10(6), 621; https://doi.org/10.3390/polym10060621

Model Studies on Load-Settlement Characteristics of Coarse-Grained Soil Treated with Geofiber and Cement

1
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
2
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
*
Author to whom correspondence should be addressed.
Received: 4 May 2018 / Revised: 31 May 2018 / Accepted: 4 June 2018 / Published: 5 June 2018
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Abstract

This study aims to verify the effectiveness of fiber reinforcing with and without cement on settlement controlling of subgrade models, and to investigate the effect of fiber reinforcement on the load-settlement behavior of subgrade models. To this end, laboratory subgrade model tests were conducted under different static vertical loads. Three subgrade models composed of different fillers were constructed in a rigid concrete tank, and the internal earth pressures and settlements at different depths were measured through an earth pressure cell and settlement plate. Results show that the fiber-reinforced model keeps a slight difference to the unreinforced model in terms of earth pressure distribution under lower applied surface pressure. However, the earth pressure at various locations under each surface pressure was obviously lower than that of the other two models due to the combined effect of fiber and cement. In addition, for the unreinforced subgrade model, the 60 cm settlement domain was restricted within 40 cm depth through fiber-cement and fiber reinforcing, and the total settlement under 100 kPa was decreased by 48.5% and 30.8%, respectively. Moreover, reinforced models present with different settlement deformation features. The inflection points, after which the rate of settlement decreased with increasing applied surface pressure, were observed in the pressure-settlement curves. Under 200 kPa, the fiber-cement and fiber reinforcement decreased the total settlement of the unreinforced model by 61.4% and 34.7%, respectively. The greater applied surface pressure, the more efficient was fiber-cement reinforcing in settlement controlling. View Full-Text
Keywords: fiber reinforcement; fiber-cement reinforcement; laboratory subgrade model test; load-settlement characteristics fiber reinforcement; fiber-cement reinforcement; laboratory subgrade model test; load-settlement characteristics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, Y.; Su, L.; Ling, X.; Wang, J.; Yang, Y. Model Studies on Load-Settlement Characteristics of Coarse-Grained Soil Treated with Geofiber and Cement. Polymers 2018, 10, 621.

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