| Author | Abiera, Henry Orpeza |
| Call Number | AIT Thesis no. GT-90-21 |
| Subject(s) | Soils--Reinforcement
|
| 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. GT-90-21 |
| Abstract | The reinforcement of earth. which may be defined as the inclusion o:f
resistant elements into a soil mass to improve its mechanical properties. has
emerged over the last two decades as a technically attractive and
cost-effective technique for extending the use of soil as a construction
material. This study investigated the mechanisms involved in a mechan1cally
stab1lized earth with both extensible and inextensible reinforcements. Using
the weathered clay from Bangpain Industrial Estate, Bangkok, Thailand, the
behavior and the mechanism of a reinforced soil was studied utilizing the
modified direct shear and laboratory pullout apparatus. Thirty two test set
ups with six types of reinforcement (two types of tensar, two sizes of
bamboo and two sizes of steel) were tested under the pressure range of 1
to 13 tsm. Soil was cured at 16% moisture content and compacted at 95%
dry of optimum density. Comparisons had been made between their pullout.
capacities and it was found that grids made of 1/2" diameter steel bars have
generated the highest capacity while tensar SS2 had the least. It was
apparent that ideally extensible reinforcements did not contribute significantly
to the strength of the soil but they provided ductility and smaller Joss of
post peal< resistance as compared to the inextensible one. Likewise, prediction
equations on the pullout capacities of the grids were compared with the
actual test results. It was found out that the pullout capacities of steel
grids can be closely estimated by using JEWELL et. al. (1984) expression
with the incorporation of the normalization factor, Nwd. A more conservative
design can be attained by using the expression of NIELSEN &. ANDERSON
(l 984). On the other hand, the frictional resistances of the flat grids can
be closely simulated by using JEWELL et. al. (1984) general bond equat1on.
With the poor-quality and cohesive backfill, a reinforced earth can
be an economical solution to stability and differential settlement problems
during embankment constructions in places with thick soft clay deposits
because it is cheaper and readily available. |
| Year | 1991 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-90-21 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Bergado, Dennes T. |
| Examination Committee(s) | Indraratna, Buddhima ;Honjo, Yusuke
|
| Scholarship Donor(s) | Federal Republic of Germany; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |