Numerical investigation of seepage dissolution evolution of the bottom expansion cutoff wall in deep overburden

Gan, Lei; Xu, Chen; Shen, Zhenzhong; Xu, Liqun; Zhang, Hongwei; Liu, Yuan

doi:10.1016/j.conbuildmat.2023.131510

Cited by 3 publications

(2 citation statements)

References 51 publications

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“…Unfortunately, existing models primarily focus on contact dissolution simulations without considering seepage effects [24][25][26]31], failing to reflect the long-term dissolution degradation characteristics of concrete impermeable structures. Furthermore, the majority of the developed seepage dissolution degradation analysis models did not account for the impact of non-equilibrium decomposition of solid-phase calcium induced by seepage flow [32], which is not consistent with reality. As a result, the evolutionary process of seepage dissolution in concrete impermeable walls of earth-rock dams has yet to be truly revealed, and its seepage dissolution durability control indices remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Durability Analysis of Concrete Cutoff Wall of Earth-Rock Dams Considering Seepage and Dissolution Coupling Effect

Guo,

Lu,

Song

et al. 2024

Water

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In this paper, a novel numerical model for characterizing the seepage and dissolution coupling effect on the durability of anti-seepage walls of earth-rock dams is proposed. The model considers the influence of hydraulic gradient-driven seepage on the non-equilibrium decomposition of the calcium dissolution in concrete, as well as the effects of seepage dissolution on pore structure, permeability, and diffusivity. The reasonableness of the model is validated by experimental and literature data, which is then applied to analyze the deterioration and failure processes of a concrete cutoff wall of an earth-rock dam in Zhejiang Province, China. On this basis, the seepage dissolution durability control indices of anti-seepage walls are identified. The findings demonstrate that the suggested method accurately explains the calcium leaching process in concrete. Under the seepage and dissolution coupling effect, calcium in the wall continuously decomposes and precipitates, leading to varying degrees of increases in structural performance parameters, which weaken the seepage control performance of the walls and consequently result in an increase in seepage discharge and hydraulic gradient. By proposing the critical hydraulic gradient as a criterion, the service life of the wall is projected to be 42.8 years. Additionally, the upstream hydraulic head, the initial permeability coefficient, and the calcium hydroxide (CH) content are three crucial indices affecting the durability of walls, and these indices should be reasonably controlled during the engineering design, construction, and operational phases.

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Section: Introductionmentioning

confidence: 99%

Durability Analysis of Concrete Cutoff Wall of Earth-Rock Dams Considering Seepage and Dissolution Coupling Effect

Guo,

Lu,

Song

et al. 2024

Water

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“…The development of coal resources has gradually moved toward larger underground mines [5,6]. For mining deep coal resources, as the osmotic pressure increases, the increase in micropore seepages in coal-bearing strata sandstone leads to serious shaft wall deterioration, which is one of the main disasters endangering the safe production of mines [7,8]. At the same time, as the depth of mines continues to increase, the hydrogeological conditions of coal mines become increasingly complex [9,10], leading to pore channels suitable for fluid seepage in rock formations and altering the various original properties of the rock [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulations of Pore Structures and Seepage Characteristics of Deep Sandstones

Zhu,

Wu,

Zhang

et al. 2023

Processes

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Previously conducted studies have established that deep underground rock masses have complex pore structures and face complex geological conditions. Therefore, the seepage problem of such rock masses seriously affects engineering safety. To better explore the seepage law of deep rock masses and ensure engineering safety, indoor experimental methods such as casting thin sections, scanning electron microscopy, and mercury intrusion testing were utilized in this study. The microscopic pore shape, size, distribution, and other structural characteristics of sandstone in coal bearing strata were analyzed. The tortuosity calculation formula was obtained by the theoretical derivation method. And a numerical model was established for seepage numerical simulation research through microscopic digital image methods. The seepage law of surrounding rocks in the Tangkou Coal Mine roadway under different conditions is discussed. The research results indicate that the complexity of the pore structure in porous media leads to an uneven distribution of flow velocity and pressure within the medium. Meanwhile, with the change of physical properties, the fluid flow characteristics also undergo significant changes. The research results can effectively guide micropore water blocking, reduce the impact of groundwater on the environment, ensure the environment and safety of the project, and provide guidance for other geological projects.

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Hydraulic fracturing in cement mortar subjected to seepage-sulfate coupled attack under varying pH levels

Xu,

Zhao,

Zhang

et al. 2024

Construction and Building Materials

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Numerical investigation of seepage dissolution evolution of the bottom expansion cutoff wall in deep overburden

Cited by 3 publications

References 51 publications

Durability Analysis of Concrete Cutoff Wall of Earth-Rock Dams Considering Seepage and Dissolution Coupling Effect

Durability Analysis of Concrete Cutoff Wall of Earth-Rock Dams Considering Seepage and Dissolution Coupling Effect

Experimental and Numerical Simulations of Pore Structures and Seepage Characteristics of Deep Sandstones

Hydraulic fracturing in cement mortar subjected to seepage-sulfate coupled attack under varying pH levels

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