Prediksi Penurunan Tanah Menggunakan Prosedur Observasi Asaoka Studi Kasus: Timbunan di Bontang, Kalimantan Timur

Nawir, Hasbullah; Apoji, Dayu; Fatimatuzahro, Rahmatyar; Pamudji, M. Dwi

doi:10.5614/jts.2012.19.2.5

Cited by 5 publications

(9 citation statements)

References 1 publication

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“…This result indicates that the Asaoka method shows a reasonable prediction of the final settlement, but the method cannot provide the settlement behavior at the early time of construction. Furthermore, Nawir et al [6] recommended that a carefully recorded observational data is essential to estimate the final settlement accurately. However, the problem of Asaoka method can be compensated by numerical method.…”

Section: Final Settlement Predicted By Asaoka Methodsmentioning

confidence: 99%

“…In the Asaoka Method, the magnitude of actual ground settlement can be predicted without the parameters used in the consolidation analysis, such as pore water pressure data, drainage length, maximum soil strain and consolidation coefficient. However, the method needs a complete field measurement [5,6]. The field data are deriving and analyzed by curve fitting (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Ground settlement prediction of embankment treated with prefabricated vertical drains in soft soil

2018

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Excessive settlement due to consolidation can cause damage to the structure’s rest on soft soil. The settlement takes place in relatively longer. The preloading and prefabricated vertical drain (PVD) is often applied to accelerate the primary settlement. The issue in this research is the estimation of the settlement. The Asaoka method and the finite element method using PLAXIS-2D are used to estimate the final settlement of a PVD treated embankment. For the former, a complete record of the settlement was required; for the latter, some ground parameters are needed for the PLAXIS-2D analysis, such as the permeability of the soil. Because the installation process of PVD tends to influence the permeability of the in-situ soil around the PVD, the soil permeability after the installation of PVD needs to be adjusted. The numerical results were compared with actual settlement data to find out the best-fit input parameters (i.e. soil permeability) of the actual data. It was found that the best-fit soil permeability (k) used in the numerical study was about one-half of the k value determined from the laboratory test. The Root Mean Square Deviation shows that the settlement predicted by the numerical analysis has approximately 30% of the actual settlement.

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Section: Final Settlement Predicted By Asaoka Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ground settlement prediction of embankment treated with prefabricated vertical drains in soft soil

2018

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“…The existing formula has to be slightly modified if the embankment placed step by step. If load placed each step is Δp, the effective overburden stress is p o ', and the pre consolidation stress is p c ' (as shown in Figure 1) the consolidation formula [4 (3) where: C c = compression index C s = swelling index If PVD is installed to accelerate the consolidation period, the formula to calculate the degree of consolidation caused by excess pore water flows into the PVD (U h ) [5] is:…”

Section: A Terzaghi Methodsmentioning

confidence: 99%

“…In this paper, the C h value will be determined from settlement field data taken from the trial embankment at the reclamation area for container yard at Kuala Tanjung, Medan, North Sumatera. The methods adopted to determine the C h value were Terzaghi [1], Asaoka [2], and Finite Element [3] methods. From this study, it will be known the exact value of C h and the best method to determine it.…”

Section: Introductionmentioning

confidence: 99%

Consolidation Coefficient in Horizontal Direction (Ch) Determined from Field Settlement Data By Using Terzaghi, Asaoka, and Finite Element Methods

Lastiasih

Mochtar

Nasya

2017

IJPS

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In order to predict the consolidation period in the field, consolidation coefficient in vertical direction (C v) parameter is needed. When vertical drains installed in the compressible layer in order to shortened the consolidation period, it needs consolidation coefficient in horizontal direction (C h). This C h parameter has to be determined from the field settlement that usually obtained from the trial embankment. However, it is very expensive to carry out the trial embankment; therefore, it is usually assumed to be 2 till 5xC v. In this paper, the assumption of the C h value will be proven by using field settlement data taken from the trial embankment at the reclamation area for container yard at Kuala Tanjung, Medan, By choosing the C h value, the compression vs time curves were predicted by adopting the Terzaghi, Asaoka, and Finite Element methods. Afterwards, these predicted settlement curves were plotted with the field settlement curves; from this plotting, it could be figured out the predicted curves which has C h value the same with the field C h value. The results show that from three methods adopted in this study, only the Terzaghi and the Asaoka methods give satisfactory results in settlement prediction. Consequently, only the Terzaghi and Asaoka methods are adopted to determine the C h value. The C h value obtained is about the same, that is 3C v until 5C v. When that C h value used back to predict the settlement, the Asaoka method gives better result than the Terzaghi method.

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“…This is because the Asaoka method is overrated to represent the actual conditions in the field. In addition, Asaoka's method predicts final settlement based on available field data [20].…”

Section: Back Calculation Of Consolidation Coefficientmentioning

confidence: 99%

Prediction Analysis on Coefficient of Consolidation Values in Improved Soft Clays

Fitriani,

Aspar,

Arthono

et al. 2023

Majalah Ilmiah Pengkajian Industri

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Consolidation is a phenomenon in soil mechanics that often causes geotechnical problems. One solution to overcome consolidation phenomena is by speeding up process of pore water pressure dissipation. The type of soil improvement to upgrade the performance of soft clay is by applying pre-fabricated vertical drain (PVD) and pre-compression simultaneously. Geotechnical instrumentations such as settlement plates, piezometers, and inclinometers were installed at the field of study to monitor magnitude of settlement during consolidation process. After the final settlement was achieved, the consolidation parameters such as coefficient of consolidation, and rate of settlement, were back calculated. Prediction analysis of consolidations parameters was performed by means of Asaoka method. The results of this study is very interesting and provide useful engineering information. It is interesting to note that this case study may be beneficial use to practicing engineers and researchers. Keywords: settlement; Asaoka method; degree of consolidation; geotechnical instrumentations; soft clay

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Prediksi Penurunan Tanah Menggunakan Prosedur Observasi Asaoka Studi Kasus: Timbunan di Bontang, Kalimantan Timur

Cited by 5 publications

References 1 publication

Ground settlement prediction of embankment treated with prefabricated vertical drains in soft soil

Ground settlement prediction of embankment treated with prefabricated vertical drains in soft soil

Consolidation Coefficient in Horizontal Direction (Ch) Determined from Field Settlement Data By Using Terzaghi, Asaoka, and Finite Element Methods

Prediction Analysis on Coefficient of Consolidation Values in Improved Soft Clays

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