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Full-Text Articles in Civil Engineering
Dimensional Stability Of Geosynthetic Clay Liners In Landfill Applications, Gregory R. Olsen
Dimensional Stability Of Geosynthetic Clay Liners In Landfill Applications, Gregory R. Olsen
Master's Theses
An investigation was conducted related to the dimensional stability of geosynthetic clay liners (GCLs) in landfill applications. Multiple occurrences of panel separation of overlap seams in GCLs have been documented; however, explanation for the relative contribution of various mechanisms causing shrinkage has been limited. A systematic test program was conducted to determine the effects of a variety of conditions on GCL dimensional stability.
Effects of initial moisture content, permeant type, and overburden pressure were tested by subjecting various GCL products to wet-dry cycles and measuring the dimensional change with each cycle. Different GCL types were each tested under various combinations …
Development Of A High Strain-Rate Constitutive Model For Sands And Its Application In Finite Element Analysis Of Tunnels Subjected To Blast, William T. Higgins Iv
Development Of A High Strain-Rate Constitutive Model For Sands And Its Application In Finite Element Analysis Of Tunnels Subjected To Blast, William T. Higgins Iv
Master's Theses
This thesis describes the development of a constitutive model for simulating the high strain-rate behavior of sands and demonstrates the use of the model by analyzing underground tunnels subjected to blast. The constitutive model is based on the concepts of the critical state soil mechanics and bounding surface plasticity theory. The model captures the behavior of sand under multi-axial loading conditions and predicts both drained and undrained behavior at small and large strains. Perzyna’s overstress theory is incorporated in the model to simulate the viscoplastic behavior of sand under high strain rate. The model follows a nonassociated flow rule.
The …