Behavior of MSE wall/embankment with geogrid and metallic reinforcements on hard foundation | |
| Author | Mongkhol Nualkliang |
| Call Number | AIT Thesis no.GE-10-05 |
| Subject(s) | Soil-cement construction Embankments Soils--Reinforcement |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geotechnical and Geoenvironmental Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-10-05 |
| Abstract | Mechanically stabilized earth wall/embankment is reinforced soil with artificial materials which enhancement of the compressive strength in reinforced soil is added by tensile strength from the reinforcements. The mechanism of reinforced earth involves the generation of frictional and bearing resistances between the soil and the reinforcement. These forces are manifested in the soil in a form analogous to increased confining pressure and/or anisotropic cohesion that enhances the strength of the composite material. This study presents results of laboratory investigations on the interactions between soil and the reinforcements consisted of three types of geogrids (PET, PP and HDPE), steel wire grids and metallic strip, respectively. Thus, a field full scale mechanically stabilized earth wall (MSEW) with metallic strips (MS) and steel wire grids (SWG) and a reinforced soil slope (RSS) with polypropylene (PP), high density polyethylene (HDPE) and polyester (PET) were constructed and monitoring. Subsequently, 2D finite element simulations were done. Finally, the observed results were confirmed to the K-stiffness working stress method. From laboratory large-scale direct shear test, the R interface value of metallic materials is in general higher than polymeric reinforcement materials because of its geometrical and frictional characteristics. The investigated steel wire grids-to-soil interaction is on the one hand better than the polymer reinforcement because of bigger and stiffer transverse members while the metallic strips have ribbed surface which generated additional bearing resistances. The behavior of a mechanically stabilized earth wall (MSEW) and a reinforced soil slope (RSS) on hard foundation were observed. The lateral displacements and settlements were very small referring to the metallic reinforced MSEW using steel wire grids and metallic strips. The RSS deform much more because of their lower reinforcement stiffness. The comparisons of the reinforcing materials in terms of stiffness from highest to lowest are metallic strip (MS), steel wire grids (SWG), polypropylene (PP), high density polyethylene (HDPE) and polyester (PET). The results of 2D finite element simulation on the results full scale MSEW and the RSS walls by using input parameters obtained from laboratory test have good agreement with the field measurements. While, the results out of the K-stiffness method for internal design of the reinforcing materials of MSEW and RSS agreed well the field-monitoring data and, therefore, can be recommended for revisions of current conservative design method. |
| Year | 2011 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-10-05 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado, Dennes T. |
| Examination Committee(s) | Noppadol Phien-wej;Park, Kyung-Ho;Montri Dechasakulsom |
| Scholarship Donor(s) | Department of Highways Scholarship, Thailand;AIT Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2011 |