Numerical and Experimental Studies of Diffusion Law of Grouting with Expansible Polymer

Hao, Meimei; Wang, Fuming; Li, Xiaolong; Zhang, Bei; Zhong, Yanhui

doi:10.1061/(asce)mt.1943-5533.0002130

Cited by 50 publications

(16 citation statements)

References 15 publications

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“…1. According to the special diffusion effect of polymer slurry (Wang et al 2014;Hao et al 2018), the finite element strength reduction method is used to analyze the stability of slope reinforced by polymer micro anti-slide pile. The anti-slide pile model with diameter D=30 cm and the high polymer soil ring pile model with thickness D=5 cm around the pile are established; the slope gradient is i=0.4, the slope height is 20 m, the slope length is 50 m, the ground to underground 2 m is silty clay, below 2 m is granite.…”

Section: Calculation Model Of Polymer Micro Anti-slide Pilementioning

confidence: 99%

“…(Naudts 2003) reviewed the development history of polyurethane materials, and introduced non-aqueous reactive polyurethane materials. (Wang et al 2014) made a comprehensive study on the chemical characteristics, compressive strength and tensile strength of polymer materials, and explored and analyzed the diffusion law of polymer in soil and the bonding characteristics with silt, the diffusion mechanism of polymer grouting was numerically simulated by (Hao et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Optimal Design and Numerical Analysis of Soil Slope Reinforcement by a New Developed Polymer Micro Anti-slide Pile

Wang

Han

et al. 2021

Preprint

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As a new material, polyurethane polymer has been widely used in engineering in recent years due to the excellent engineering mechanical properties. Based on the characteristics of this material, a multi pipe grouting micro anti-slide pile is proposed, which is formed by using polymer slurry as grouting material. Compared with traditional anti-slide pile, the polymer micro pile has the advantages of strong applicability, no water reaction, small disturbance, fast construction, economy and durability. As a flexible retaining structure, polymer micro-piles can strengthen the slope by cooperating with the forces. However, there is no report on the reinforcement of slope by polymer micro piles at present. In this paper, a three-dimensional multi row polymer micro piles model for slope reinforcement considering different embedded depth and pile location is established. Safety factor, thrust force of landslide behind pile, length of pile and mises stress are taken as four factors to evaluate reinforcement effect, the optimal reliability of polymer micro anti-slide pile for slope reinforcement is evaluated by giving different weight values to each factor through multi factor comprehensive evaluation method. The safety factor of slope (Fs), landslide thrust behind pile and mises stress of pile are analyzed under different embedded depth (le) and pile position (px). The results show that the best embedded depth is about1/8 − 1/12 of the horizontal length of the landslide behind the pile when multi row polymer micro piles are used to reinforce the slope; the optimum position of pile arrangement is 0.55–0.65 times the slope length from the top of the slope.

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Section: Calculation Model Of Polymer Micro Anti-slide Pilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Design and Numerical Analysis of Soil Slope Reinforcement by a New Developed Polymer Micro Anti-slide Pile

Wang

Han

et al. 2021

Preprint

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show abstract

“…Fu et al [7] performed numerical simulation on the diffusion process of cement grouting in the fractures of the rock mass to determine reasonable hole spacing and other parameters. Hao et al [8] developed a numerical simulation of polymer grout diffusion in a single fracture to analyze the pressure distribution. Deng et al [4] proposed a CFD simulation approach based on 3D fracture network model to study the grouting process of a dam's foundation.…”

Section: Of 19mentioning

confidence: 99%

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

et al. 2019

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Grouting has always been the main engineering measure of ground improvement and foundation remediation of hydraulic structures. Due to complex geological conditions and the interactions between the grout and the fractured rock mass, which poses a serious challenge to the grouting diffusion mechanism analysis, fracture grouting has been a research hotspot for a long time. In order to throw light on the grout diffusion process in the fractured rock mass and the influence of grout on the fracture network, and to achieve more realistic grouting numerical simulation, in this paper a grouting process simulation approach considering fluid–structure interaction is developed based on the 3D fractured network model. Firstly, the relationship between fracture apertures and trace lengths is used to obtain a more realistic value of fracture aperture; then a more reliable model is established; subsequently, based on the 3D fracture network model, different numerical models are established to calculate fluid dynamics (grout) and structure deformation (fractured rock mass), and the results are exchanged at the fluid–structure interface to realize the grouting process simulation using two-way fluid-structure interaction method. Finally, the approach is applied to analyze the grouting performance of a hydropower station X, and the results show that the grouting simulation considering fluid–structure interaction are more realistic and can simultaneously reveal the diffusion of grout and the deformation of fracture, which indicates that it is necessary to consider the effect of fluid–structure interaction in grouting simulation. The results can provide more valuable information for grouting construction.

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“…Nonwater reacted polymer grouting materials produced via a two-component polyurethane foam are a new kind of grouting materials [1]. Under grouting pressure, the polymer material reacts chemically, expands in volume, and rapidly solidifies [2]. is material has a good compressive strength [3], relatively high tensile strength [4], and good water impermeability [5].…”

Section: Introductionmentioning

confidence: 99%

Statistical Characteristics of Polymer Grouting Material Microstructure

Wang

Fang

et al. 2020

Advances in Civil Engineering

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The two-component foaming polyurethane is a kind of grouting material that has recently been widely used in engineering structural repair. Its physical and mechanical properties are closely related to its microstructure. Therefore, the qualitative and quantitative analysis of polymer microstructure has always been a research hotspot. The statistical characteristics of polymer grouting material microstructure are investigated by six groups of specimens with different densities, and the density varies from 0.1 to 0.6 g/cm3. The microstructure morphology of polymer was observed and described by scanning electron microscopy (SEM), and the microstructure feature parameters were extracted and calculated by image processing technology. The quantitative analysis of section cell roundness distribution, cell diameter distribution, and polymer porosity shows that low-density polymer materials have anisotropy. While the density exceeds 0.3 g/cm3, the cell structure tends to be spherical. The section cell diameters obey a normal distribution, and when the density increases, the cell diameter decreases. The porosity of the polymer has a linear negative correlation with the density. The polymer matrix has a density of 1.21 g/cm3. The microstructural information obtained in this study will help establish a cell-based model to explain the mechanical response of rigid polymer foams.

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Numerical and Experimental Studies of Diffusion Law of Grouting with Expansible Polymer

Cited by 50 publications

References 15 publications

Optimal Design and Numerical Analysis of Soil Slope Reinforcement by a New Developed Polymer Micro Anti-slide Pile

Optimal Design and Numerical Analysis of Soil Slope Reinforcement by a New Developed Polymer Micro Anti-slide Pile

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

Statistical Characteristics of Polymer Grouting Material Microstructure

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