03780nas a2200433 a 4500 20260817163731.0 160129s2013 th uu|m rtt 0| a1eng d .b12160799 AIT Thesis no.GE-12-04 Tahir, Muhammad Usman Assessment on applicability of sequential tunnel excavation in Bangkok soft ground by means of numerical analysis Pathum Thani, Thailand : Asian Institute of Technology, 2013 1 online resource (122 p.) : ill. + 1 online resource Thesis ; no. GE-12-04 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geotechnical and Earth Resources Engineering, School of Engineering and Technology Thesis (M. Eng.) - Asian Institute of Technology, 2013 Mechanized tunneling is always feasible and justified with its boring length and in case of short length tunnels or cross cuts between two tunnels or a non circular tunnels required then the excavation method is to be changed from mechanized to the conventional excavation method. A numerical study is performed for assessment of applicability of sequential tunnel excavation in Bangkok subsoil condition. Three schemes of sequential excavation are investigated using the Mohr Coulomb and the Hardening soil model. Three water pressure conditions in the soil layers are defined to explore the effect on tunneling. The undrained effective stress analysis is performed using effective strength and stiffness parameters. The 2D plane strain model is implemented with consideration of the 3D face effect by stress reduction method. Shotcrete lining is considered with two different stiffness values to incorporate approximate effect of shotcrete aging. The results demonstrate that sequential tunnel excavation is not feasible in Bangkok subsoil. Two mechanisms of failure are found first is failure of soil cover above roof and second is the base heave. However, with improved ground it is possible to excavate the tunnel sequentially. Increase in dimension or strength of improved ground results in reduction in lining loads and surface settlement. Hardening soil model results in narrow and deeper surface settlement troughs if compared to the Mohr Coulomb model result. Water pressure variation results in higher bending moment in lining. Tunneling Simulation methods Thailand Bangkok Excavation Simulation methods Thailand Bangkok Noppadol Phien-Wej, Chairperson Bergado, Dennes T., Examination Committee Pham, Huy Giao, Examination Committee Asian Development Bank (ADB), Scholarship Donor Asian Institute of Technology. Thesis ; no. GE-12-04 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B03033 .b12160799 mnait z 240405 0 160129 m a z 0 000:001:PDF:b1216079:002391:0:0:0:0:0:0 Abstract--AIT Thesis no.GE-12-04 n mnait mnait mnarc 20 40 Barcode : 30050120813547 CREATED : 2016-01-29 RECORD # : i12875636 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120813539 CREATED : 2016-01-29 RECORD # : i12875648 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120401822 CREATED : 2017-09-14 RECORD # : i13100464 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 9567 9567 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.GE-12-04 30050120813547 2026-08-17 16:37:31 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.GE-12-04 30050120813539 2026-08-17 16:37:31 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.GE-12-04 30050120401822 2026-08-17 16:37:31 1 2026-08-17 40