Numerical Modeling of Single Pile Behaviors Due to Groundwater Level Rising

Phoban, Harutus; Seeboonruang, Uma; Lueprasert, Prateep

doi:10.3390/app11135782

Cited by 12 publications

(14 citation statements)

References 21 publications

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“…Figure 8 shows the relationship between the total displacement and time of the surface displacement predictions of all the boreholes in Zone D. There is a tendency for rebound displacement due to groundwater recovery. As shown in Figure 9, in the same study area, Our results show soil surface behavior similar to other results, such as the results of the PLAXIS2D evaluation, which showed that soil displacement rates are equal to 0.35 cm/year from 1997 to 2037 [18]. The results of ABAQUS software produced rebound rates equal to 0.26 to 0.32 cm/year from 1997 to 2016 [19].…”

Section: Soil Surface Displacementsupporting

confidence: 86%

“…As such, in this study, we focused on calculating and predicting the soil surface displacement during groundwater level recovery by hand calculation. Finally, the soil displacement result from theoretical calculation was compared with the findings of previous research from Phoban et al [18] and Saowiang and Giao [19].…”

Section: Introductionmentioning

confidence: 97%

“…Soil surface displacement was calculated by using a numerical model. Phoban et al [18] used a series of two-dimensional finite element analyses with fully coupled flow-deformation analysis in PLAXIS2D to predict soil surface displacement. The model referred to a previous centrifuge test.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Land Subsidence during Groundwater Recovery

2022

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The Chao Phraya River basin is located in the central area of Thailand, which experiences many land subsidence issues due to groundwater pumping. The Department of Groundwater Resources (DGR) has been recording data on the changes in the groundwater level due to water pumping since 1960 until the present time. In 1997, the DGR issued a law regulating the use of groundwater due to its effect on the changes in the groundwater level. The changing of the groundwater level was separated into two periods. The first period is the high groundwater pumping ratio that led to a rapid decrease in the groundwater level of about 27 m from the ground surface. After the DGR issued the new law in the second period, the pumping ratio decreased and the groundwater level increased. The groundwater level tends to reach the ground surface. In the past, the groundwater level decrease was affected by the land subsidence. Therefore, this study focused on calculating and learning the behavior of the soil surface displacement during groundwater level recovery to the ground surface in Bangkok, Thailand. We obtained the 3D soil profiles adopted from eight boreholes from the Department of Public Works and Town & Country Planning. The soil profile data were verified by monitoring the data from the Department of Groundwater Resources (DGR) in the same area. The soil layers of the 3D soil profile were analyzed to calculate the soil surface displacement based on the consolidation theory of Terzaghi. We also examined the displacement behavior of the clay layers during the groundwater level recovery to the ground surface by assuming that the soil layers below the groundwater level do not settle or rebound. The surface displacement results showed that the surface ends to move upward or rebound, which is a similar trend to that reported in previous research. All the considered locations showed similar soil surface displacement trends. The soil displacement ratio is 0.21 to 0.53 cm/year during the groundwater recovery.

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Section: Soil Surface Displacementsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 97%

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Evaluation of Land Subsidence during Groundwater Recovery

2022

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“…The horizontal pile load test in damped sandy loam soil was followed by numerical experiments in PLAXIS 2D (PLAXIS official website) and pile performance modelling by using the finite element method [12]. The soil performance is shown in Table 1.…”

Section: Numerical Experimentsmentioning

confidence: 99%

The horizontal load test on pressure-injected piles in damped subsiding Soils

Setev¹,

Buyankhishig

Dashjamts

et al. 2023

E3S Web Conf.

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In connection with the needs of the present, the question of the optimal design of building foundations, taking into account the regional characteristics of loess-like silty clay soils, common in Mongolia, becomes relevant. In recent years, in the Orkhon-Selenginsky region and especially in the Darkhan region, industrial and civil buildings and engineering structures are being actively built up and planned to regulate the problems of overpopulation and smoke in the city of Ulaanbaatar, Mongolia. The regularity of the process of changing the stress-strain state of loess-like subsidence soils of the base due to technogenic moistening is subject to the general theory of subsidence soil mechanics, but each region of the world has its own distinctive feature depending on territorial and climatic conditions. Settling clayey soils of Mongolia in their natural state have a relatively high content of water-soluble and slightly soluble carbonate and other salt compounds and, due to their cemented and crystallized structural bonds, they have relatively high mechanical properties, but the mechanical properties, due to the weakening of structural bonds during soaking, sharply decrease to a value of c =7.0…10.2 kPa, φ=16….÷20°, E=3.5…4.5 MPa and subsidence begins depending on the type of soil at pressure Р=0,15 MPA and W= ( 6.7…8.6)% or W_sat, while the relative subsidence index is ε_sl>0.01. At pressure Р=0,2MPa and W=(6.1…7.6)%, subsidence begins, and at pressure Р=0.25MPa and W=(5.2…6.9)% drawdown begins. These moisture values are calculated respectively at the given pressures as the initial settling moisture W_sl. This article discusses the results of field tests of bored piles for a horizontal load, taking into account the moistening of the subsidence soil of the foundation of buildings and structures.

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“…Previous researcher predicted that the ground displacement has rebound approximately 0.26 to 0.32 cm/yr by using ABAQUS software. [4] studied ground displacement during groundwater recovery from 1997 to 2037 also, the ground displacement has rebound around 35 percent of the maximum ground displacement of groundwater decreasing period.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Displacement on Unsaturated Soils in Bangkok Plain

Intui¹

2022

GEOMATE

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Chao Phraya River basin is located in the central area of Thailand which has a lot of ground displacement issues due to groundwater pumping. Following the Department of Groundwater Resources (DGR) in Thailand recording data, the groundwater level changed due to water pumping from 1960 until now. In 1997, DGR issued a law regulating the use of groundwater effect to the characteristic of changing groundwater levels. Therefore, the characteristic of groundwater level change was separated into two periods. In the first period, the high groundwater pumping rate led to a rapid decrease in groundwater level at about 27 meters from the ground surface. After DGR issued the law, the pumping ratio decreased and the groundwater level was increased or recovered close to the ground surface. The groundwater level recovery still affected ground displacement. This study focuses on evaluating and predicting ground displacement during groundwater level recovery in the future based on Terzaghi's theory. The study area considers only zone D (10 to 14 m of soft clay thickness) in the Bangkok clay area. The soil profile and the soil boring log were gathered from the Department of Public Works and Town & Country Planning in Thailand. This study research the ground displacement behavior of the clay layer during groundwater recovery. All data will be used to make a 3D soil profile and calculate to predict ground displacement in the future of the soil layer. The results found that the ground displacement has rebound to the ground surface of every bored hole during the groundwater recovery.

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Numerical Modeling of Single Pile Behaviors Due to Groundwater Level Rising

Cited by 12 publications

References 21 publications

Evaluation of Land Subsidence during Groundwater Recovery

Evaluation of Land Subsidence during Groundwater Recovery

The horizontal load test on pressure-injected piles in damped subsiding Soils

Evaluation of Displacement on Unsaturated Soils in Bangkok Plain

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