STUDI PENGARUH KANDUNGAN PUPUK KIMIA DALAM TANAH TERHADAP KEKUATAN GESER TANAH LEMPUNG INDRAMAYU
Green revolutions which were started on 1960 and came into Indonesia on 1972, have earned to overcome threat lacking of global food, but side effects of these revolutions however, can still be felt at this time in terms of balance of natural ecosystem. Using uncontrolled chemical fertilizer continuo...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/3152 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Green revolutions which were started on 1960 and came into Indonesia on 1972, have earned to overcome threat lacking of global food, but side effects of these revolutions however, can still be felt at this time in terms of balance of natural ecosystem. Using uncontrolled chemical fertilizer continuously has changed soil composition resulting in change of the soil behavior. More precisely, this research is focused on the effects of chemical fertilizer content in the soil to the soil shear strength of soil, Soil samples, called Indramayu's clay, were taken from one of the gristle slide area in West Java. This soil is clay with rate 25,34% montmorillonite, specific gravity 2,58, liquid limit ( LL) 74,26% and Plasticity Index 46,39%. Each sample was made as follows: first the Indramayu's clay was compacted into its optimum water content and then was mixed with a certain rate of chemical fertilizer. Four types of chemical fertilizer were used in this research: Urea, KCL, TSP, and NPK with rate of 0.01%, 0.1%, 0.5%, and 1%. Before conducting the shearing test, the samples were cured for 0, 1, 3, 7, and 14 day curing period. Unconfined Compression Test (UCS) was the main test used to study the shear strength of the samples, while Triaxial Unconsolidated Undrained test was used as a control. Results of this research show that the presence of chemical fertilizer in the soil changed the plasticity and reduced the strength of the soil. The strength reduction increased with higher chemical fertilizer content, which is more chemical fertilizer content resulting in more strength reduction. The results also show that the strength reduction increased with curing time. The highest reduction of unconfined compressive strength (q„) was on samples with TSP followed by samples with Urea and NPK, while samples mixed with KCL showed the lowest reduction of q |
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