04623nam a2200457 4500 20260817162348.0 040998 th eng .b11723634 AIT Thesis no.GE-97-05 Chishti, Irfan Ahmad Analysis of ground improvement using prefabricated vertical drains with surcharge preloading : a study of the Second Bangkok Chonburi Highway Project Bangkok : Asian Institute of Technology, 1998 220 leaves Thesis ; no. GE-97-05 A thesis submitted in partial fulfillment of the requirements for the degree of the Master of Engineering, School of Civil Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1998 The soft Bangkok clay foundation at the Second Bangkok Chonburi Highway Project (SBCH) was improved using prefabricated vertical drains (PVD). Monitoring instrumP-nts such as surface settlement plates, deep settlement plates, inclinometers, piezomuters etc. were installed in the subsoil, in order to observe the deformation behavior under loading. The highway embankment functioned as a test embankment. The Department of Highways, Thailand, arranged for monitoring and documentation of the deformation behavior of subsoil. Using different methods, this monitored record, supplemented with the laboratory test results, was processed in order to predict the in-situ horizontal coefficient of consolidation of soil as well as rate and amount of settlement. The in-situ horizontal coefficient of consolidation was back-calculated by Asaoka's method. The maximum surface settlement was calculated using one-dimensional consolidation theory, Skempton-Bjerrum method as well as Asaoka's method. The degree of consolidation was predicted by Hansbo's theory for radial drainage and one dimensional consolidation theory for vertical drainage. Finally, the perfo1mance of PVD at-site was evaluated. The back-calculated horizontal coefficient of consolidation ranged from 2 m2 /yr to 44 m2 /yr. The rate of settlement predicted by Asaoka's method was in excellent agreement with the observed one, whereas the one-dimensional consolidation method as well as Skempton-Bjerrum method showed some overprediction. In addition, a FEM based computer software, capable of calculating the consolidation of multi-layered soil, named PVD-SD was also used to predict the rate and amount of settlement. It slightly overpredicted the results. Finally, the monitored deformation behavior was compared with the one predicted during the design stage of SBCH. The actual embank.:1ent height was found to be lower than the designed one, resulting in some delay in gaining the required degree of consolidation and, consequently, a delay in project completion. Due to lower embankment height, the elevation of actual embankment after completion of 90% degree of consolidation can be lower than the highest flood level in the region, endangering the highway in case of flooding. Neve1theless, the PVD at SBCH proved to be an effective means of ground improvement. Vertical drains Embankments Second Bangkok-Chon Buri Highway Project Bergado, Dennes T., Chairperson Guey, Lin Der, Co-Chairperson Balasubramaniam, A.S., Examination Committee Government of Japan, Scholarship donor Asian Institute of Technology. Thesis ; no. GE-97-05 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B12763 .b11723634 mnait x 250610 0 980904 m a x 0 mnait mnait mnarc mnarc 20 40 Barcode : 30050120717755 CREATED : 1997-07-04 RECORD # : i12091194 LPATRON : 1015850 LCHKIN : 2002-09-30 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 3 TOT RENEW : 0 Barcode : 30050120717722 CREATED : 1997-07-04 RECORD # : i12091200 LPATRON : 1018025 LCHKIN : 2004-04-10 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 2 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050160081039 CREATED : 2016-05-17 RECORD # : i12980365 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120933881 CREATED : 2019-04-12 RECORD # : i13237111 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 4797 4797 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no.GE-97-05 30050120717755 2026-08-17 16:23:48 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no.GE-97-05 30050120717722 2026-08-17 16:23:48 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.GE-97-05 30050160081039 2026-08-17 16:23:48 1 2026-08-17 40 0 0 0 0 MAIN MAIN mnarc 2026-08-17 50.00 0 AIT Thesis no.GE-97-05 30050120933881 2026-08-17 16:23:48 3 2026-08-17 20