碩士 / 國立海洋大學 / 河海工程學系 / 84 / ABSTRACT
Hydraulic sand fills is one of the most important reclamation
method for near shore area. The structure and fines
content of the reclaimed soil are related with the
consolidation and mechanism. The reclaimed soil is formed by
precipitation. The aggregates of the reclaimed soil have soft
and loose structure. In the hydraulic fill
process, the loss of fine content is due to the
operation of machines and transportation of soil. Thus, the
properties of filled soil will change according
to the fine content. Therefore, to simulate the
accumulate of soil in the laboratory, and to evaluate the effect
of fine content on properties of reclaimed soil, is
important research topic. In this study, the
filled material in Yun-Ling near shore area was used as test
samples and sea water were adopted as the pore media. Using
hydraulic sand fill simulation method in the
laboratory to prepare the specimen, to discuss the
accumulate properties of the soil aggregates. Using traditional
moist tamping method, the specimens were prepared
with different relative density (Dr=35%,55%,75%)
and fine content (0%,10 %,20%,30%).One dimensional
consolidation test and Rowe type consolidation test were
conducted. The parameters Cv , Cc and mv are
obtained to evaluate the consolidation
properties of the reclaimed soil. The influence factors such as
packing properties, fines content, relative
density, pore media, load boundary and size effect are
discussed. By using the Rowe type consolidation system, seepage
test is conducted to evaluate the seepage parameter k, and to
prove the reliability of the seepage parameter
adopted by consolidation test. In this
study, to evaluate the influence of earthquake or cyclic load on
the reclaimed soil, Rowe type consolidation cell is
adopted for dynamic load test. By using the
traditional consolidation results of Lin(1995), the test result
obtained from Rowe consolidation test are compared. The
influence of different test method on the
consolidation prerties of reclaimed soil are
discussed.
As shown in the test results, fines content has great influence
on the consolidation properties of reclaimed
soil. The parameters Cc , av and mv increases as
the fines content increases. This show that the soil with higher
fines content has greater shrinkage properties. For the
reclaimed soil with higher fines content, the
seepage parameter k adopted from the consolidation
test are close to the k adopted from seepage test.
To simulate the hydraulic sand fill process, the hydraulic sand
fill simulation system developed by Chien(1993) are
adopted to prepare the specimen. The specimens
prepared by hydraulic sand fill method are fill with 2%.
The specimens prepared by moist tamping method and hydraulic
sand fill method have different results. As
shown in the test results, the consolidation
parameters (Cc , mv and k) adopted from the specimen prepared by
moist tamping method have larger value
compared to the specimen prepared by
hydraulic sand fill method.
In this study, different pore media (sea water and tap water)
are adopted. As shown in the test results, the
consolidation properties of the reclaimed soil are
influence by the pore media. For the specimen using sea water as
pore media, the reclaimed soil would have larger
settlement value. Both rigid and soft
loading boundaries are adopted for the consolidation test.
As shown in the test results, the specimens conducted by soft
loading boundary, the irregular stress are
transmitted in the soil. The specimens conducted
by rigid loading boundary, the regular stress are transmitted in
the soil. The consolidation parameters Cc, av, mv and
k) adopted from the specimens conducted by
rigid loading boundary have larger value compared
to the specimens conducted by soft loading boundary (about 20%).
In this study, three different specimen size (3inch, 6inch and
10 inch) are discussed. As shown in the test
results, the size would not have great
influence on the results adopted from the specimens conducted by
rigid loading boundary. As for the specimens
conducted by soft loading boundary, the results
show greater variation(average of 20% greater). This shows that
size effect would influence the consolidation properties of the
reclaimed soil. As shown in the test results, the
seepage parameter k adopted from the seepage
experiment are about 3.
As shown in the test results, the load applied system for the
traditional consolidation test can be influenced
by human manual and frictions. The specimen
would not be saturated. Thus, the tests adopted from traditional
consolidation test and Rowe consolidation test would show
different results. For the influence of the cyclic
loading on the consolidation properties, the
settlement caused by cyclic loading are 1~5 times greater than
static loading. This show that earthquake has great
inflence on the consolidation properties of the
reclaimed soil. For the cyclic loading less than 60, the cyclic
load settlement are 2 times grater than the static
load settlement. Concluding the
results and figures, the results can be a reference for the
fonudation stability analysis. The consolidation properties of
the reclamation area can be estimated, for the design,
stability analysis and related research. Keyword:
hydraulics sand fill, Rowe type consolidation test, soil
aggregate, fines content, load boundary,
size effect, cyclic dynamic load.
| Identifer | oai:union.ndltd.org:TW/084NTOU0192012 |
| Date | January 1996 |
| Creators | Cheng, Chich-Ching, 鄭志清 |
| Contributors | Lien-Kwei Chien, 簡連貴 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 438 |
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