Fundamental study of conservative contaminant transport mechanism in clay and application of Bangkok clay for clayey barrier | |
| Author | Amatya, Binod Lal |
| Call Number | AIT Thesis no. GE-01-08 |
| Subject(s) | Clay--Thailand--Bangkok Soil permeability--Thailand--Bangkok Soil pollution--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-01-08 |
| Abstract | A fundamental study of non-reactive contaminant transport mechanism in clay is presented. Hydraulic conductivity (K) and void ratio ( e) relationships of Bangkok Soft Clay are established. Falling Head Hydraulic Conductivity test was performed to find out the prescribed relationship. Hydraulic conductivity derived according to Consolidation Theory is higher than that from Falling Head Test. A modification factor (r') is recommended to adjust the result from Consolidation Theory. Test results show that 'K' is uniquely dependent upon 'e' and independent on Over Consolidation Ratio. Numerical simulation of the 1-D, 2-D and 3-D contaminant migration of various non-reactive solutes is presented. The effect of various factors influencing contaminant migration is illustrated by parametric study. Numerical simulation was performed using MODFLOW and MT3D packages of GMS software based on Finite Difference Method. It was observed that the appropriate choice of boundary condition is very essential for modeling contaminant transport. Simulation with zero concentration boundaries at the base of liner gives higher contaminant leakage through the liner than the other boundary conditions, but this may be the actual site condition and the real solution. A criterion of specified leachate chemical flux passing thorough the barrier is better than the specified leachate concentration of flux to judge the efficiency of liner. To analyze the actual leakage behavior due to Geomembrane pinhole defect, 3-D simulation is essential. Simulation of contamination in clay deposits can be done by taking the average porosity and equivalent K of various layers of clay. A study of a hypothetical 12.0m Bangkok Clay deposit with aquifer system at the base indicated prospects for using a natural Bangkok Clay deposit as part of a lining system in waste containment structures. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-01-08 |
| 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) | Takemura, Jiro; |
| Examination Committee(s) | Noppadol Phien-wej;Glawe, U.; |
| Scholarship Donor(s) | King's Scholarship for Education of Asia, Thailand; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology |