CHARACTERIZATION OF CLAYSTONE DESIGN PARAMETERS IN IBU KOTA NUSANTARA (IKN) WITH A CASE STUDY ON SLOPE STABILITY USING HARDENING SOIL AND HOEK BROWN MODEL
Construction development in the Indonesian Capital City (IKN) is faced with the challenge that there have not been many research studies and further analysis conducted by various experts in their fields. In the Phase I Development process of IKN, especially in the initial geotechnical investigation,...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/87648 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Construction development in the Indonesian Capital City (IKN) is faced with the challenge that there have not been many research studies and further analysis conducted by various experts in their fields. In the Phase I Development process of IKN, especially in the initial geotechnical investigation, it was discovered that the construction built passed through the Pamaluan Formation claystone. This study aims to determine the characteristics and classification of claystone in IKN, especially for determining shear strength parameters so that it can be a design reference for construction implementation in the IKN Area, especially for slope stability analysis involving claystone layers for the short and long term. Determination of claystone design parameters is carried out by correlating field and laboratory data and back analysis calculations. Slope stability analysis is carried out using a soil mechanics and rock mechanics approach through the Hardening Soil and Hoek Brown models. From the study, it was found that IKN claystone consists of weathered claystone and fresh claystone. Weathered claystone has a moderately weathered weathering level, low-medium durability index, and low-medium plasticity level (2.70-9.80%) while fresh claystone has a slightly wethered-unweathered weathering level, medium-high durability index, and low plasticity level (1.10-7.30%). The weathered claystone layer has a range of design parameter values c' = 18-36 kPa ?????peak= 25 - 32?, and ?????residu= 22 – 32.5 while the fresh claystone layer has a range of design parameter values c' = 25-50 kPa ?????peak= 28 – 35?, and ?????residu= 22 – 32.5?. The safety factor value produced by the slope stability analysis using the Hoek Brown model is relatively more critical compared to the Hardening Soil model. The Hoek Brown model is able to describe the behavior of rock mass where the failure mechanism is controlled by intensive defects (discontinuities) represented by the GSI value, but this model cannot show changes in claystone parameters in long-term and short-term conditions. The Hardening Soil model is able to describe changes in long-term and short-term parameters, but this model cannot accommodate the influence of the existence of discontinuities in claystone. |
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