| Author | Park, Chi Myeon |
| Call Number | AIT Thesis no. GT-90-25 |
| Subject(s) | Soil stabilization
|
| 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-90-25 |
| Abstract | Because of the increase in the construction speed due to the rapid development
of new construction equipment and new measuring devices for density control ,
the conventional compaction control technique need to be reviewed and revised
if necessary. It is often found, in fact, that not all measurements satisfy the
quality control specifications.
In order to find a new sampling scheme and control procedure, two different
sampling schemes were carried out; namely, the extensive local sampling scheme
(ELSS) and the sparse global sampling scheme (SGSS). For the analysis of ELSS,
extensive local density measurements from four locations at Mae-Kuang Main
Dam construction site near the Chiang Mai, in Thailand were carried out, while
for the SGSS, five Dam construction records and a highway embankment construction
record were collected from different countries.
In the ELSS, the measured values fluctuated almost at the same magnitudes
that of the sparse global sampling scheme (SGSS). Furthermore, very little
correlations were observed between the adjacent measurement points. This implies
that the compaction characteristics of soil fluctuates from point to point almost
the same magnitude as that of whole construction. In the SGSS, the separation
of microscale fluctuation and macroscale fluctuation was observed by estimating
autocorrelation functions. The microscale fluctuation component was relatively
higher magnitude compared to the macroscale fluctuation component. This results
coincides with the results obtained from the ELSS.
The moving average process are introduced as the local estimation procedure
based on Kriging. The property of the autocorrelation function has been
emphasized to define the moving average process. By moving average process,
the fluctuation was much reduced because the microscale fluctuation of the soil
properties is white noise like fluctuation, and thus, the microscale fluctuation
was smoothed in the estimated moving average process.
It is concluded that a soil compaction control procedure which is more firmly
based on the concept proposed in this study should be established. In other
words, a procedure which take into account the microscale and the macro scale
fluctuations and the moving average concept should be formulated on the statistical
bases.
In ELSS at Mae-Kuang Main Dam site, two different methods (i.e., sand
replacement method and radio isotope method) to measure the dry density and
water content were employed to compare the results. The two methods generally
resulted in the satisfactory agreement each other. |
| Year | 1991 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-90-25 |
| 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) | Honjo, Yusuke; |
| Examination Committee(s) | Bergado, Dennes T. ;Indraratna, Buddhima
|
| Scholarship Donor(s) | Federal Republic of Germany; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |