Numerical simulation reinforcing subgrade by geogrid in fieled test

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HADDAD A.; Khakpour Moghaddam h.; KHODAKARAMI M.I.

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:1 Page(s): 79-89

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Title

Numerical simulation reinforcing subgrade by geogrid in fieled test

Author(s)

HADDAD A. | Khakpour Moghaddam h. | KHODAKARAMI M.I. | Issue Writer Certificate

Keywords

geogridQ2

Reinforced subgradeQ1

Finite element methodQ2

settlementQ2

Abstract

One of the appropriate methods to improve the roadway that is built on the weak subgrade is use of geosynthetic reinforcement that was already highly regarded. Nowadays, using new materials such as gesynthetic Polymer in the pavement layers, is highly regarded due to technical specifications and better distribution of traffic loads and prevents local settlement. Existence of the reinforcement layer at the base-subgrade interface results in lower vertical pressure on the underlying layer (subgrade) due to wider distribution of load from truck traffic. Many field and laboratory test conducted to investigate the behavior of Reinforced subgrade and achieve to the suitable design methodology has been implemented. However, due to limitations such as high cost of laboratory or field test, evaluate the performance of reinforced roads under traffic loads by numerical simulation methods have been developed. Numerical analysis are capable that with simulation of paved and unpaved road, develop the parametric studies for complex structures such as Reinforced subgrade. In this study, the Finite element method (FEM) is used to investigate the behavior of the geosynthetic reinforced roads. Finite element method is able to analyze stability, time-dependent problems and those problems with non-linear properties for the material. The simulation procedure is done in several steps. First the exact geometry and dimensions and other data of field test were extracted to produce the numerical model, then the Elastoplastic behavior is used to introduce materials behavior of pavement structure. Third, quasi static loading is also performing to acquire real simulation of experimental model. Therefore, the three-dimensional model in ABAQUS that has several advantages compared to the two-dimensional model conducted and the results of the 3d numerical study with field tests results in Montana university-Bazmn, is compared, then the effect of reinforcing mechanical properties, elastic module of base layer and Reinforced subgrade on settlement was evaluated. The results showed that the simulation by Finite element method, according to the assumptions used in three-dimensional modeling includes the quasi-static loading and frictional interaction parameters in terms of the contact surfaces, have a good agreement with the results of field test. FE analysis indicated that geogrid improves pavement life in terms of rutting. The numerical study results also show that the settlement of reinforced road strongly influenced by the mechanical properties of reinforcement. So with the existence of reinforcements, the section settlement will reduce up to 84 percent. FE analysis showed that benefits of reinforcement are more noticeable when stiffer geogrid are used. With reduce the elastic module of geogrid (about 50%) the surface settlement about 61% increased. If the base layer has a low stiffness, Existence of the reinforcement has more effect on reducing the settlement and the strain. Whereas increasing in the base layer stiffness, indicates the larger amounts of reduction on surface settlement with the existence of geogrid at the interface of base layers and subgrade and also effect the stiffness of subgrade and base layer in reinforced test section on the surface settlement compared to unreinforced test section about 50% reduced.

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APA: Copy

HADDAD, A., Khakpour Moghaddam, h., & KHODAKARAMI, M.I.. (2018). Numerical simulation reinforcing subgrade by geogrid in fieled test. MODARES CIVIL ENGINEERING JOURNAL, 18(1 ), 79-89. SID. https://sid.ir/paper/256660/en

Vancouver: Copy

HADDAD A., Khakpour Moghaddam h., KHODAKARAMI M.I.. Numerical simulation reinforcing subgrade by geogrid in fieled test. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(1 ):79-89. Available from: https://sid.ir/paper/256660/en

IEEE: Copy

A. HADDAD, h. Khakpour Moghaddam, and M.I. KHODAKARAMI, “Numerical simulation reinforcing subgrade by geogrid in fieled test,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 1 , pp. 79–89, 2018, [Online]. Available: https://sid.ir/paper/256660/en

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