A three-dimensional algorithm for estimating water-tightness of cement-treated ground with geometric imperfections

Pan, Yutao; Yi, Jiang Tao; Goh, Siang-Huat; Hu, Jun; Wang, Wei; Liu, Yong

doi:10.1016/j.compgeo.2019.103176

Cited by 15 publications

(14 citation statements)

References 28 publications

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“…e fluidity test results show that the inclusion of PVA helps extend the pumpable period, in which contractors can have sufficient time to cast cutoff structures. is potentially helps improve workmanship and homogeneity of the slurry wall, which is crucial to the cutoff performance of the cutoff walls [14,34,35]. Table 8 shows that the permeability coefficients of slurry under different curing periods decrease with time.…”

Section: Fluidity and Pumpable Periodmentioning

confidence: 99%

Application of a Bentonite Slurry Modified by Polyvinyl Alcohol in the Cutoff of a Landfill

Dai

Sheng

Pan

et al. 2020

Advances in Civil Engineering

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Soil-bentonite cutoff walls are usually used to contain the contaminants of landfills. The pumpability, permeability, and adsorption capability of the slurry are all crucial to the performance of the cutoff wall. In this study, the effect of polyvinyl alcohol (PVA) was used to improve the performance of bentonite slurry. A series of lab tests were conducted to evaluate the pumpability, permeability, and adsorption capacity with different concentrations of PVA treatment. Results show that the addition of PVA can increase the fluidity and pumpable period of slurry, which facilitates the casting and grouting during construction. The addition of PVA also helps to reduce the permeability coefficient of slurry and improve the adsorption capability which enhances the cutoff performance of the walls.

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Section: Fluidity and Pumpable Periodmentioning

confidence: 99%

Application of a Bentonite Slurry Modified by Polyvinyl Alcohol in the Cutoff of a Landfill

Dai

Sheng

Pan

et al. 2020

Advances in Civil Engineering

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“…Pan et al 16,17,40 proposed a three-dimensional discretized algorithm (TDA) to evaluate the steady-state discharge rate of groundwater leakage through geometrically imperfect water barriers (eg, jet-grouted earth-plug, cutoff wall, and diaphragm wall). This algorithm was found to be reasonably accurate compared to RFEM (10-30% relative error), for calculation durations of only 1/10 3 -1/10 2 times those for RFEM.…”

Section: F I G U R Ementioning

confidence: 99%

“…Pan et al 16,17,40 derived a theoretical solution for steady-state groundwater discharge rate through a geometrically imperfect water barrier. The discharge rate was found to be proportional to the harmonic average of the cross-sectional areas of the untreated zone along the seepage passage, where q is the resultant discharge rate through the defective cutoff wall,̃(…”

Section: Estimation Of Discharge Rate Of Penetrated Cutoff Wallsmentioning

confidence: 99%

“…When the cutoff wall is not penetrated by untreated zones, the discharge rate is much lower than for the penetrated cases, as will be shown later. In unpenetrated cases, a representative thickness should be used to characterize the water-tightness, following Croce and Modoni 3 and Pan et al 40 The thickness of the wall can be evaluated by counting the number of treated nodes in the y-direction, as shown in Figure 7A. A typical realization of wall thickness distribution is plotted in Figure 7B.…”

Section: Estimation Of a Representative Thicknessmentioning

confidence: 99%

“…This eliminates the possibility of assigning permeability coefficient using the user-defined material interface provided by Plaxis or Abaqus. Hence, an in-house three-dimensional FEM program for transient flow problems was coded in Matlab (referred to as FEM3D), this being an upgraded version of the steady-state code in Pan et al 40 The pseudo code of FEM3D considering geometric imperfections is summarized in Figure 3B. A preliminary verification study for transient-state flow through a homogeneous unit block showed that the three-dimensional FEM code gives the same result as the commercial software Geostudio.…”

Section: Comparison With Femmentioning

confidence: 99%

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An efficient transient‐state algorithm for evaluation of leakage through defective cutoff walls

Pan

Hicks

Broere

2020

Num Anal Meth Geomechanics

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Artificial barriers are widely used to prevent leakages. However, due to construction errors during the wall installation, passages with small dimensions may occasionally penetrate through the barrier, undermining its tightness. A three-dimensional discretized algorithm (TDA) is proposed for quantitatively estimating the transient-state discharge rate through defective cutoff walls. By discretizing the wall into a three-dimensional refined mesh grid, the algorithm enables an examination of penetrating passages, an evaluation of defect dimensions, and an estimation of discharge rate through the penetrating passages. A rigorous realization-by-realization comparison between the TDA and the finite element method (FEM) was made, and it was found that the TDA results show strong correlations with the FEM results, but at a remarkably lower (1/10 3-1/10 4) computational cost. The TDA generally gives a discharge rate that is 0.1-1.0 times greater than its FEM counterpart, as the lengthened seepage distance due to random corrugations in the penetrating untreated zone cannot be replicated by the TDA.

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Modeling diameter of jet grouting columns using Bayesian framework

Zhao,

Chen,

Wang

2023

Num Anal Meth Geomechanics

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This study proposes a new model in explicit form to predict the diameter of the jet grouting column of three popular jet grouting systems (i.e., single, double, and triple). The proposed model can quantify the uncertainty associated with the prediction. Bayesian model selection was used to determine the optimal models and, the bootstrap sampling method was adopted to avoid bias in the collected database. The predictions agree well with the measured data, and the 95% credible intervals can cover almost all the measured data on the testing dataset, which indicates the robustness of the proposed model. A simple formula combined with a table was established to facilitate the engineers in applying the proposed model. The results reveal that soil type has a significant impact on diameter prediction. Uncertainty quantification can reveal possible fluctuations in column diameter and is vital to get a cost‐efficient design.

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A three-dimensional algorithm for estimating water-tightness of cement-treated ground with geometric imperfections

Cited by 15 publications

References 28 publications

Application of a Bentonite Slurry Modified by Polyvinyl Alcohol in the Cutoff of a Landfill

Application of a Bentonite Slurry Modified by Polyvinyl Alcohol in the Cutoff of a Landfill

An efficient transient‐state algorithm for evaluation of leakage through defective cutoff walls

Modeling diameter of jet grouting columns using Bayesian framework

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