| Author | Chatchai Eurfur |
| Call Number | AIT Thesis no. GE-99-07 |
| Subject(s) | Vertical drains
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-99-07 |
| Abstract | The series of laboratory tests have been conducted to investigate the effects of
confining drain by clay and different thickness of rubber membrane on discharge capacity
of prefabricated vertical drain (PVD). There are two types of PVD were tested namely:
Mebra drain and CN drain. The test results indicate that confining the drain by thick
rubber membrane is higher discharge capacity than thin rubber membrane confinement.
Due to the tension stiffness of rubber membrane, the filter cannot be deform freely as that
in clay. When confining the PVD with clay, the discharge capacity yielded much lower
discharge capacity than rubber confinement. In addition, the clay particles can enter the
drainage channel and the filter jacket can squeeze into the flow channel and further
reduce the water flow. From the test results, Mebra drain consistently yielded the higher
discharge capacity than CN drain because filter jacket of Mebra drain has higher tensile
strength than CN drain. Thus, the tensile strength of filter jacket significantly affect the
discharge capacity of PVD. In addition, the field test was constructed in AIT campus
using the PVD to recharge and remove the negative piezometric drawdown. The PVD
was installed to 10 m below the original ground level in square pattern with 1mx1 m
spacing. The sand embankment which served as drainage blanket and construction
platform, was constructed to a height of 1.2 m. The piezometric level in PVD area
increased and removed the negative drawdown within 28 days after PVD installation.
The PVD has successfully removed the negative drawdown in the subsoil. The maximum
surface settlement 5.5 mm was observed at 130 days after installation. The settlement
prediction by agreed with the field settlement. |
| Year | 2000 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-99-07 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado Dennes T.;Guey. Lin Der; |
| Examination Committee(s) | BalasubramaniamA.S.;Kinya Miura; |
| Scholarship Donor(s) | Self-Support; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |