Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Resilient Interface Shear Modulus from Short-Strip, Cyclic Pullout Tests
The national movement to develop a mechanistic-empirical design guide for pavements requires that the fundamental material properties for all components of the design be quantified. When geosynthetics are used to reinforce the base course layers of flexible pavements, one of the two main design parameters is the interaction between the geosynthetic and the surrounding aggregates. Interaction at this interface can be quantified in terms of a stiffness parameter, Gi, the resilient interface shear modulus. The most relevant interaction tests use cyclic loads like those experienced in transportation applications. Currently, however, there is no standard test to quantify soil/geosynthetic interaction using cyclic loads. This research effort modified the standard pullout test protocol to resemble the resilient modulus tests for unbound aggregates which utilizes cyclic loads at various levels of normal confinement. The resilient modulus for unbound aggregates (MR) closely resembles Gi, since they are both simultaneously dependent on shear load and confinement. Overall, the results from the cyclic pullout tests conducted on six geosynthetics showed that cyclic pullout testing has great potential for describing a stress dependent interface shear modulus. A three-parameter, log-log equation developed in the NCHRP Project 1-28a (NCHRP, 2000) was used to predict Gi. Correlations between predicted and measured values were somewhat erratic. Additional research is planned to improve the test equipment and establish specific test protocols.
Resilient Interface Shear Modulus from Short-Strip, Cyclic Pullout Tests
The national movement to develop a mechanistic-empirical design guide for pavements requires that the fundamental material properties for all components of the design be quantified. When geosynthetics are used to reinforce the base course layers of flexible pavements, one of the two main design parameters is the interaction between the geosynthetic and the surrounding aggregates. Interaction at this interface can be quantified in terms of a stiffness parameter, Gi, the resilient interface shear modulus. The most relevant interaction tests use cyclic loads like those experienced in transportation applications. Currently, however, there is no standard test to quantify soil/geosynthetic interaction using cyclic loads. This research effort modified the standard pullout test protocol to resemble the resilient modulus tests for unbound aggregates which utilizes cyclic loads at various levels of normal confinement. The resilient modulus for unbound aggregates (MR) closely resembles Gi, since they are both simultaneously dependent on shear load and confinement. Overall, the results from the cyclic pullout tests conducted on six geosynthetics showed that cyclic pullout testing has great potential for describing a stress dependent interface shear modulus. A three-parameter, log-log equation developed in the NCHRP Project 1-28a (NCHRP, 2000) was used to predict Gi. Correlations between predicted and measured values were somewhat erratic. Additional research is planned to improve the test equipment and establish specific test protocols.
Resilient Interface Shear Modulus from Short-Strip, Cyclic Pullout Tests
Cuelho, E. V. (Autor:in) / Perkins, S. W. (Autor:in)
Geo-Frontiers Congress 2005 ; 2005 ; Austin, Texas, United States
09.10.2005
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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