Foundation stability on sandy soil due to excessive pore water pressure: laboratory observations

Hakam, Abdul; Yuliet, Rina; Risayanti,; Putra, Hendri Gusti; Sunaryo, Sony

doi:10.1088/1755-1315/361/1/012011

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…Ketika beban siklik diberikan pada tanah pasir, maka akan terjadi peningkatan tegangan antar elemen tanah yang diikuti dengan peningkatan tekanan air pori pada tanah tersebut. Peningkatan tekanan air pori pada tanah pasir dapat menyebabkan partikel-partikel tanah bergerak dengan mudah, pergerakan partikel tanah ini menyebabkan hilangnya kekuatan tanah sehingga akan sangat berpengaruh pada daya dukung tanah [17]. Pada tanah pasir lepas dimana permeabilitasnya sangat besar, peningkatan tekanan air pori dapat langsung terjadi sesaat beban siklik diberikan yang menyebabkan tegangan efektif mengalami penurunan secara drastis karena adanya perubahan teganganregangan pada tanah [18].…”

Section: Likuifaksiunclassified

Potensi Likuifaksi Pasir Seragam Berdasarkan Tegangan Air Pori Dan Ukuran Butiran (Laboratory Model)

Risayanti

Hakam²

2022

jcivil

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Analisis untuk mengetahui potensi likuifaksi pada suatu deposit tanah dapat dilakukan melalui parameter tanah seperti ukuran butiran dan tekanan air pori. Penelitian ini bertujuan untuk mengetahui perilaku tanah pasir seragam terhadap kenaikan tekanan air pori akibat beban siklik serta potensinya terhadap likuifaksi akibat dari perubahan tekanan air pori tersebut. Sample yang diujikan adalah pasir seragam yang tertahan pada saringan #20, #40, #60, #100 dan #200 yang diambil dari uji ayakan, kemudian masing-masing sampel yang dalam kondisi jenuh dimasukkan dalam alat pengujian. Dari pengujian yang dilakukan pada pasir seragam dengan beberapa variasi ukuran butiran tanah diketahui bahwa saat beban siklik diberikan kenaikan tekanan air pori berbeda pada masing-masing ukuran butiran tanah. Perubahan tekanan air pori terbesar terjadi pada sampel pasir seragam berbutir halus yaitu tertahan pada saringan #100 dan #200 dengan perubahan sebesar 0,28 kg/cm2 dan 0,27 kg/cm2. Meningkatnya tekanan air pori tentu disertai dengan penurunan tegangan efektif tanah. Maka dapat diketahui bahwa sampel pasir seragam berbutir halus lebih berpotensi terjadinya likuifaksi yaitu sampel yang tertahan pada saringan #100 dengan pengurangan tegangan efektif 91,19% dan #200 dengan pengurangan tegangan efektif 89,66%. Sampel pasir seragam yang tertahan pada saringan #60 memiliki potensi likuifaksi yang lebih rendah dibandingkan dengan sampel yang berukuran lebih halus karena mengalami pengurangan tegangan efektif 58,47%, namun memiliki kecenderungan perubahan tekanan air pori yang cukup besar. Sampel pasir seragam yang tertahan pada saringan #20 dan #40, tidak memiliki potensi terhadap likuifaksi selama pengujian dilakukan. Tegangan efektif pada sampel ini berkurang sebesar 18,46% dan 32,31%.

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Section: Likuifaksiunclassified

Potensi Likuifaksi Pasir Seragam Berdasarkan Tegangan Air Pori Dan Ukuran Butiran (Laboratory Model)

Risayanti

Hakam²

2022

jcivil

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“…However, the vibration of the mining vehicle will cause the displacement of soil particles, resulting in the sharp rise of pore water pressure and the decrease of effective stress in a short period of time, thus causing soil liquefaction. Soil liquefaction will cause the mining machine to sink and slip, which will have an adverse effect on the efficiency and safety of mining [15][16] . Therefore, it is of great significance to study the influence of the vibration of the mining machine on the deep-sea sediments.…”

Section: Introductionmentioning

confidence: 99%

Research on coupled thermo-hydro-mechanical dynamic response characteristics of saturated porous deep-sea sediments under vibration of mining vehicle

Wang

Shi

Huang

et al. 2021

Appl. Math. Mech.-Engl. Ed.

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The excessive deformation of deep-sea sediments caused by the vibration of the mining machine will adversely affect the efficiency and safety of mining. Combined with the deep-sea environment, the coupled thermo-hydro-mechanical problem for saturated porous deep-sea sediments subject to the vibration of the mining vehicle is investigated. Based on the Green-Lindsay (G-L) generalized thermoelastic theory and Darcy’s law, the model of thermo-hydro-mechanical dynamic responses for saturated porous deep-sea sediments under the vibration of the mining vehicle is established. We obtain the analytical solutions of non-dimensional vertical displacement, excess pore water pressure, vertical stress, temperature, and change in the volume fraction field with the normal mode analysis method, and depict them graphically. The normal mode analysis method uses the canonical coordinate transformation to solve the equation, which can quickly decouple the equation by ignoring the modal coupling effect on the basis of the canonical mode. The results indicate that the vibration frequency has obvious influence on the vertical displacement, excess pore water pressure, vertical stress, and change in volume fraction field. The loading amplitude has a great effect on the physical quantities in the foundation, and the changes of the physical quantities increase with the increase in loading amplitude.

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“…On the other hand, boiling does not occur in coarse sand-fraction above medium sand-fraction, so that the foundation might not collapse [13]. The upward flow of water can reduce the bearing capacity of the foundation and cause the building to fall and slope [2,13,14]. The results of observation from the model test conducted by Ueng et al show that upward flow and vibrations that occur in the saturated fine sand-fraction increase the excess pore water pressure (EPWP) and reduce the effective stress [6].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Water-Saturated Sand-Fractions on the Sand-Boiling Phenomenon

Yuliet¹

2021

GEOMATE

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Understanding the stress distribution behaviors along a soil cross-section have been the challenging topics in geotechnical engineering for the last two decades. Stress analysis by considering saturated sand without upward flow of water has been well studied. However, stress analysis in saturated sand-fraction with upward flow of water, which causes the sand-boiling phenomenon still needs a better understanding. In this paper, the relative density is used to indicate the denseness and looseness of sand fraction. The sand-boiling behaviors are then investigated through two scenarios. The first scenario uses a fine sand-fraction, called the FS scenario. The second scenario uses a mixture of coarse and medium sandfractions, called the CS-MS scenario. For the FS scenario, the fine sand-fraction only consists of one layer, while for the CS-MS scenario, it consists of two layers where the coarse sand-fraction is above the medium one. The use of the relative density values of the fine sand, medium sand, and coarse sand in both scenarios are 7.6%, 12.4%, and 5%, respectively. As a result, all sand fractions used are categorized as very loose sand because their relative densities are less than 15%. The FS scenario shows that the effective stress is equal to zero obtained within 10 seconds at a depth of 0.12 m under the ground surface. This indicates that the sand boiling has occurred in the FS scenario. Whereas in the CS-MS scenario, the variation of effective stress with depth for a soil layer with upward seepage has a value greater than zero. This indicates that the sand boiling never occurred in the CS-MS scenario. Furthermore, both scenarios also show that the addition of coarse sand-fraction above medium sand-fraction could prevent the sand-boiling phenomenon.

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Foundation stability on sandy soil due to excessive pore water pressure: laboratory observations

Cited by 3 publications

References 2 publications

Potensi Likuifaksi Pasir Seragam Berdasarkan Tegangan Air Pori Dan Ukuran Butiran (Laboratory Model)

Potensi Likuifaksi Pasir Seragam Berdasarkan Tegangan Air Pori Dan Ukuran Butiran (Laboratory Model)

Research on coupled thermo-hydro-mechanical dynamic response characteristics of saturated porous deep-sea sediments under vibration of mining vehicle

The Effects of Water-Saturated Sand-Fractions on the Sand-Boiling Phenomenon

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