Interaction of laterite backfill and steel grid reinforcements at high vertical stress using pullout tests | |
| Author | Macatol, Kenneth Carmelita B. |
| Call Number | AIT Thesis no. GT-89-12 |
| Subject(s) | Shear strength of soils--Testing Laterite |
| 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-89-12 |
| Abstract | A total of 189 laboratory pullout tests were carried out on welded wire mats embedded in compacted lateritic soil under high nor mal pressures of 1 tsm to · 13 tsm. Three bar sizes, 1/4" !'6, 3/8 " 9} a nd 1/2 " 9} each having grid sizes of 6 "x6 " and 6 " x9 " were used f o r the welded mats under three soil conditions namely : dry of optimum , optimum, and wet of optimum. The magnitude of the pullout resistance was found to be influenced by t he bar size , mesh size, compaction condition of the backfill , and overburden pressures. Pullout tests conducted on longitudinal members only yielded frictional resistance in the order of 8 to 1 5% of the total pullout capacity . Thus ; the major contribution t o the total pullout resistance of the welded . wire mesh grids is the passive resistance mobilized in front of the transverse or bearing members which is consistent with the results previously r e ported on the soil-grid reinforcement interaction. Comparison made with previous investigation s made by Amin (1989 ) . u sing lower normal pressures indicated that the pullout resistance can a l so be modeled by a bilinear curve which displayed similarity with the results of direct s h ear tests on the same backfill. This result seems to supplement previous observations regarding particle breakage phenomena· inherent to lateritic residual soils at the range of high . normal pressures. Very good correlations were obtained when actual data of the passive resistance were compared to t h e theoretical predictions of Peterson and Anderson (1980 ) , Jewell et al (1984 ) , Rowe and Davis (1982 ) and Bergadoetal (1989 ) . Consequently empirical equations are proposed for approximating the total pullout resistance of steel grids of a definite geometry u sing similar backfill as that used in t his study . |
| Year | 1990 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-89-12 |
| 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) | The Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |