Innovative use of geosynthetics for repair of slope failures along irrigation/drainage canals on soft ground | |
| Author | Phaibun Ngouchaurieng |
| Call Number | AIT Thesis no. GE-00-17 |
| Subject(s) | Geosynthetics Slopes (Soil mechanics) Soil consolidation test |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-00-17 |
| Abstract | The use of geotextile is widespread for applications in construction of embankment over soft foundation in recent years. The innovative used of geotextile reinforce in the repair of slope failures along the irrigation canals to increase stability of the canals. There are currently some uncertain assumptions in design method available for selection of geotextile as reinforcement or in evaluating the effect of this reinforcement upon the embankment behavior. Regarding the interface behavior between the backfill soil and the geotextile in geotextile reinforcement embankment, laboratory experiments were carried out using large shear-box direct shear test apparatus. Reconstituted soft Bangkok and weathered Bangkok clay were selected as subgrade and backfill soil, respectively. The type of high strength geotextile, namely: PEC200, were used in this research. A total number of twenty-four large shear-box direct shear tests were performed with different normal stresses and various the initial inclination angles of geotextiles. With the initial inclination angles (8) of 45, 60 and 90 degrees of geotextile to the shear plane, the maximum increase of shear force occurred at 60 degrees for reconstitute soft clay and 45 degrees for weathered clay. The orientation of geotextile as reflected by the inclination factor, Ir, varied from 0. 73 to 0. 78 for reconstitute soft clay and from 0. 51 to 0. 67 for weathered clay, corresponding to initial inclination angle, e, of 45° to 90°. The maximum orientation of reconstitute soft clay with geotextile are greater than the bisection direction (Ir= 0.5) but not reached to tangential direction (Ir = 1.0). For weathered clay, the maximum reorientations with geotextile are nearest to the bisectional direction (Ir = 0.5). The stability analysis of excavated slopes with combined geotextile reinforcement along the irrigation canals on soft ground will increased with increasing the layers of geotextile reinforcement. Considering the factor of safety (F.S.) about 2.0, the comparison in the aspect of cost-benefit between the geotextile reinforced slope method and the cement piles method can be made. The cost of construction using the geotextile reinforcement for repairing embankment slope failure has been found to be lower than the cement piles. Nevertheless, in the aspect to deformation, the deformation required in the cement piles stabilization to achieve the desired factor of safety for the design of construction at significantly smaller values than in the geotextile reinforcement method. |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-00-17 |
| 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, D.T.; |
| Examination Committee(s) | Miura, K.;N. Phien-Wej; |
| Scholarship Donor(s) | Royal Thai Government/Human Resource Development Program (Phase Il) ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |