HUBUNGAN ANTARA KOMPOSISI MINERAL, SIFAT FISIK, REGANGANMENGEMBANG DAN KUAT GESER PADA BATULEMPUNG, FORMASI SUBANG:STUDI KASUS DI DAERAH CISAMPIH, KEC. DAWUAN, KAB. SUBANG,JAWA BARAT
The objective of this study is to conduct detail assessment of swelling behavior of Subang Formation claystones at the Cisampih area of Dawuan, Subang Regency, West Java. Field observations were conducted to have a better understanding on swelling behavior of the claystones and its impacts. Me...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/77078 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The objective of this study is to conduct detail assessment of swelling behavior of
Subang Formation claystones at the Cisampih area of Dawuan, Subang Regency,
West Java. Field observations were conducted to have a better understanding on
swelling behavior of the claystones and its impacts. Meanwhile, laboratory tests
were carried out to analyze mineralogical composition, physical properties,
swelling strains, and shear strength of claystones.
The results from XRD and SEM analyses have shown the composition of
plagioclase, quartz, montmorillonite, Illite and kaolinite, in claystones with
different percentage. Porosity and water content were tend to increase in
weathered claystones than in fresh claystones, however unit weight was tend to
decrease. Atterberg limits analyses showed that all claystones can be categorized
as CH (clay high plasticity).
Owing to the surface (< 3 m) and more weathered condition of claystones; volume
change due to swelling process tend to decrease. The swelling strains were
significantly influenced by the ratio of (montmorillonite + Illite)/kaolinite, and the
ratio of clay minerals/non-clay, also the number of montmorillonite + Illite.
Swelling strains in the vertical direction were most likely to be higher than in the
horizontal direction, therefore it can be inferred that swelling strains of the
claystones are anisotropy. The highest volumetic can be identified on sample 6
(15.28 %), followed by 5 (8.23 %), 4 (7.54 %), 3 (3.5 %), 2 (2.49 %) and sample
1 (1.52 %). Result of direct shear tests clearly showed that shear strength were
decrease due to swelling strain, with the decrease values of shear strength were
ranging from 45 % to 57 %. |
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