Investigation of critical hydraulic gradient and its application to the design and construction of bentonite-grout curtain

Chegbeleh, Larry Pax; Akabzaa, Thomas; Akudago, John Apambilla; Yidana, Sandow Mark

doi:10.1007/s12665-019-8367-0

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Within the first 30% of the diffusion radius, the slurry pressure decreases sharply by approximately 70%; within the last 70% of the diffusion radius, the slurry pressure decreases gradually to the remaining 30%. This relationship is consistent with the engineering practices and trends of the measured data within the relevant literature [38][39][40]. The reason for this is that there is a high velocity of the slurry in the area close to the grouting tube, and a lower velocity of the slurry in the area far away from the grouting tube.…”

Section: Slurry Pressure Attenuationsupporting

confidence: 87%

Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow

et al. 2022

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Grouting in deep, loose layers are a complex process in which many modes such as infiltration, splitting, and compaction coexist. It is of great significance to establish a realistic, simplified physical model to study the law of slurry diffusion. Herein, a cylindrical diffusion model of radial tube flow is established, and the control differential equations of both the Bingham slurry diffusion velocity in a single tube and the diffusion velocity of the radial tube flow are deduced. Additionally, the calculation formulas for the diffusion radius and slurry pressure distribution function are obtained. The rationality of the theory is verified by combining our results with those of the field grouting test of the Guotun coal mine. The results show that the cylindrical diffusion model of radial tube flow can successfully characterize the slurry diffusion law of grouting in a deep, loose layer. The slurry pressure attenuation shows distinguishable stages: within the first 30% of the diffusion radius, the slurry pressure decreased sharply by approximately 70%, and the slurry pressure decreases slowly in the later stages. Furthermore, the diffusion radius has a nonlinear, negative correlation with the height of the grouting section and the comprehensive injection rate of formation; the change rate is relatively more gradual, and there are no distinguishable stages. The research results provide a theoretical basis for reasonably determining the grouting parameters of deep, loose layers in the future.

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Section: Slurry Pressure Attenuationsupporting

confidence: 87%

Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow

et al. 2022

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“…However, when applied to complex structures, the results obtained by the empirical formula method are usually inaccurate. Inverse analysis is a method of inverting the hydraulic conductivity of a material based on seepage monitoring data [9][10][11][12][13][14][15]. In comparison to the preceding two methods, it is relatively simple to operate, economically inexpensive, and highly reliable.…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Seepage Parameters Inversion Analysis Using Improved Whale Optimization Algorithm and Support Vector Regression

Li,

Shen,

Sun

et al. 2023

Applied Sciences

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Seepage is the primary cause of dam failures. Conducting regular seepage analysis for dams can effectively prevent accidents from occurring. Accurate and rapid determination of seepage parameters is a prerequisite for seepage calculation in hydraulic engineering. The Whale Optimization Algorithm (WOA) was combined with Support Vector Regression (SVR) to invert the hydraulic conductivity. The good point set initialization method, a cosine-based nonlinear convergence factor, the Levy flight strategy, and the Quasi-oppositional learning strategy were employed to improve WOA. The effectiveness and practicality of Improved Whale Optimization Algorithm (IWOA) were evaluated via numerical experiments. As a case study, the seepage parameters of the Dono Dam located on the Baishui River in China were inversed, adopting the proposed inversion model. The calculated seepage field was reasonable, and the relative error between the simulated head and the measured value at each monitoring point was within 2%. This new inversion method is more feasible and accurate than the existing hydraulic conductivity estimation methods.

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“…Inverse modeling is an alternative way to obtain the numerical calculation parameters. Extensive studies have shown the efficiency of inverse modeling for determining the hydraulic conductivity of foundation rocks and seepage-proof systems [21][22][23][24][25][26][27][28]. Most previous studies pursue steady or transient flow conditions in the inverse calculation of aquifer parameters.…”

Section: Introductionmentioning

confidence: 99%

Inverse Modeling of Grout Curtain Hydraulic Conductivity Evolution Considering the Calcium Leaching Effect

Zhang

Shen

et al. 2022

Mathematics

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The calcium leaching effect inevitably increases the grout curtain hydraulic conductivity. It is diffucult to sample and obtain the leaching-related calculation parameters for deep-buried grout curtains. This study introduced the inversion method into the calcium leaching analysis to get proper leaching-related calculation parameters and accurate results. An inverse analysis model was proposed using the genetic algorithm (GA) and finite element analysis technology to solve the calcium leaching problems. The objective function is constructed using the hydraulic head and leakage quantity time-series measurements, which improves the uniqueness and reliability of the inverse results. The proposed method was applied to the inverse analysis of the hydraulic conductivity evolution of the grout curtain in a concrete dam foundation. The predicted water heads and leakage quantity are consistent with the monitored data, indicating the rationality of this simulation. The grout curtain hydraulic conductivity prediction in 100 years is also presented. The results illustrate the feasibility of the proposed method for determining leaching-related parameters and the hydraulic conductivity prediction in the leaching process.

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Investigation of critical hydraulic gradient and its application to the design and construction of bentonite-grout curtain

Cited by 13 publications

References 8 publications

Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow

Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow

A New Approach for Seepage Parameters Inversion Analysis Using Improved Whale Optimization Algorithm and Support Vector Regression

Inverse Modeling of Grout Curtain Hydraulic Conductivity Evolution Considering the Calcium Leaching Effect

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