A new compressibility model and finite element simulation on deep mixing method (DMM) application | |
| Author | Lorenzo, Glen A. |
| Call Number | AIT Thesis no. GE-00-13 |
| Subject(s) | Soil consolidation test Finite element method |
| 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. GE-00-13 |
| Abstract | The current approach in designing DMM piles with cement still involves trial laboratory mixtures of cement and soil. Compressibility analysis currently used in DMM pile with cement is based from the method used in lime treated soil but not in cement treated soil. This study develops a new compressibility model which is used to predict the vertical yield stress of cement treated clay. The vertical yield stress is correlated with the undrained shear strength of the cement pile. A new consolidation equation, which models the combined behavior of pile and soil in a DMM unit cell, has been developed. Results from the analysis of settlement with time of Bangna-Bangpakong Highway embankment, which was improved by DMM cement piles, using the new method have been compared with that from finite element method and with that from actual monitored data, and good agreements were obtained. Finite element simulation of the actual monitored settlement data of BangnaBangpakong highway has been done under axisymrnetric analysis of the unit cell of the pile and plane strain analysis of the entire embankment. Consequently, the values of the permeability ratio, kpi1clksoi1 = 30, and the correlation of the compression modulus of the pile, Mpile = 70Cu,pile, where Cu.pile is the 28 days undrained shear strength of the cement pile from UC test, are obtained. Design charts generated from the new closed-form method that can be used to calculate the average degree of consolidation of ground improvement with DMM has been presented. Finally, the procedure for preliminary design of ground improved with DMM with cement, which does not require trial laboratory mixtures of cement and soil, is also ยท presented. |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-00-13 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado, Dennes T.; |
| Examination Committee(s) | Balasubramaniam, A.S.;Miura, Kinya ; |
| Scholarship Donor(s) | The Government of Japan ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |