Reanalysis of mechanically stabilized embankments using grid reinforcements at the second Bangkok Expressway System | |
| Author | Serate, Marilou Bayotas |
| Call Number | AIT Thesis no.GT-91-16 |
| Subject(s) | Embankments Bangkok Expressway |
| 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-91-16 |
| Abstract | This study investigated and compared the performance of a mechanically stabil ized sand embankment using both extensible {polymer geogrids ) and inextensibl e {steel bars and bamboo ) reinforce me nts . Using t he sand backfill from the Second Expressway System Site Sections NS 3 , 4 at t he Middle Ring Road Toll Plaza near Pr a c h a Chu e n Road, Banglrnl\ , Thailand. Thirty six set-ups were prepared , eighteen for pullout tests a nd eight een for direct s hear tests , and the inclus ions were s ubjected to overburden pressure ranges of 1 to 1 3 t s rn. Six types of reinforcements were used: SS! Tensar , Tenax LB 302AMP, 2 cm bamboo , 4 cm bamboo , 1/2 " diameter steel bar and 1/4 " diameter s t ee l bar. Soil was cured at 1296 plus or minus 2% mois ture contents and compacted at 95% dry of optimum densi t y. From the results of the p ullout te s ts, pullout capacities of the 1/2 " diameter stee l bars were t he h ighest while t h ose of the SS ! Te nsar were the lowest. The prediction equation of JEWELL e t a l (1 984) , incorporated by a normali zation factor, Nwd , closely estimated t he actual p ullout capacities of the flat grids {bamboo and geogrid) . On t h e other hand, t h e predi ction equation of PETERSON & ANDERSON (1 980 ) is more appl i cable to stee l grids where a ma j or p ortion of the total pullout resistance is mainl y contribut ed by the transverse members. It Has apparent that ideally extens ible reinforcements did not contribute significantly to t h e strength of the soi l but they provided ductility and s ma ller loss of post peak resistance as compared to the inextensible ones. The strength b e havior of t h e sand e mbankment rein forced with a n array of ext ensible a nd i n exten s ible reinforcements is best determined in direct s hear t es t s in whi ch t h e reinforceme nts bridge t h e shear plane. The i nte rf ace behavior between t h e sand and the six types of rei nforceme nts (1/2 " s t eel bar , .1./4 " steel bar, 2 cm b a mboo, 4 c m bamboo , SS! Te n sar and Tenax LB 302AMP) were compared and used to ana l yze the s t abili ty of t h e reinforced embankme nt. The factors of safety u sing Tenax, Tensar, bamboo and ste e l bars were calculated from PCSTABL5M and STABL6 Stabilit y Programs . |
| Year | 1991 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-91-16 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Bergado, Dennes T.; |
| Examination Committee(s) | Balasubramaniam, A.S.;Honjo, Yusu ke;Tian Ho Seah; |
| Scholarship Donor(s) | Spain; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1992 |