Experimental investigation on sealing efficiency of chemical grouting in rock fracture with flowing water

Sui, Wanghua; Liu, Jinyuan; Hu, Wei; Qi, Jianfeng; Kaiyu, Zhan

doi:10.1016/j.tust.2015.07.012

Cited by 143 publications

(57 citation statements)

References 18 publications

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“…Theoretically, the consolidation of coal and rock walls when using a high-polymer material can lead to the penetration of the material along with the fractures and openings during solidification. In the laboratory, after prefabricating fractures in the coal and siltstone blocks [23], the samples were bonded and consolidated by the high-polymer material under a grouting pressure of p = 5 MPa. Figure 7 shows the fracture filled with the injected high-polymer material to strengthen the fractured coal.…”

Section: Consolidated Single-fractured Coal and Rockmentioning

confidence: 99%

Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal

Chen

2020

Energies

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Roof collapse and wall spalling in mines commonly occurred. Grouting in the rock mass of a collapsed zone is one of the most effective technologies for solving this problem. Through grouting, the rock mass of a collapsed zone can be cemented into continuous and stable blocks, and the physical and mechanical parameters of the rock mass can be significantly improved. In order to investigate the mechanical properties and damage of rock samples after the injection of a high-polymer material, we conducted uniaxial compression tests in a laboratory on grouted specimens. A high-polymer material is commonly used to address the gangue stacking that is caused by large roof collapse and wall spalling accidents in the mining face and the cracking of coal walls. Research has shown that a high-polymer material effectively solidifies gangues. The results indicate a micromechanics effect of the grouted specimens under uniaxial compression. The compressive strength, fracture propagation, damage mode, and other specimen behaviors are related to the amount of injected high-polymer materials. A high-polymer material substantially improves the mechanical strength of the prefabricated fractured coal and rock mass via strong material adhesion. The vertically- and horizontally-consolidated coal/rock masses exhibit different properties. The use of a high-polymer material results in distinct properties of the consolidated coal and rock masses.

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Section: Consolidated Single-fractured Coal and Rockmentioning

confidence: 99%

Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal

Chen

2020

Energies

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“…In order to acquire a better understanding of the grouting mechanism of fractured rock, many experimental studies have been performed in recent decades. For example, Sui, Liu [10] experimentally studied the sealing effect of permeation grouting into a sample fracture and the patterns of grout propagation under water flow conditions. They analyzed the effect of different parameters on the sealing effect, including the initial water flow fracture rough morphology was cut by using a high-precision laser-cutting machine.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Grout Nonlinear Flow Behavior through Rough Fractures

Jin

Han

et al. 2019

Processes

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This research experimentally analyzed the impacts of various water cement (W/C) ratios of ultrafine cement grout material and normal loads FN applied to fractures on grout nonlinear flow behavior through a rough plexiglass fractured sample. An effective self-made apparatus was designed and manufactured to conduct the stress-dependent grout flow tests on the plexiglass sample containing rough fractures. At each W/C ratio, the grout pressure P increased from 0 to 0.9 MPa, and the normal loads FN ranged from 666.3 to 1467.8 N. The results of the experiments indicate that (1) the Forchheimer’s law can be used to express the results of grout nonlinear flow through rough fractures. Moreover, both nonlinear coefficient a and linear coefficient b in Forchheimer’s law decreased with the increase of the W/C ratio, but increased with the increase of the FN value. (2) For normalized transmissivity, with the increase of Re, the decline of the T/T0–Re curves means that the grout flow behavior through the fracture mainly went through three stages: the viscosity effect, then the weak inertia effect, and finally the strong inertia effect. The three stages showed that with the increase of Re, the grout flow state changed from linear to nonlinear. Moreover, with the increase of the W/C ratio, the Forchheimer coefficient β decreased. (3) At a given FN, the critical grout hydraulic gradient Jc decreased, but the critical Reynolds number Rec increased as the W/C ratio increased; at a given W/C ratio, Jc increased, but Rec decreased as FN increased.

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“…The sandy layer can cause severe damage to underground projects [1][2][3]. Grouting is a common method of soil reinforcement in underground engineering and has been playing an important role in treating the sand layer [4][5][6][7]. At present, penetration grouting method is widely used because of low grouting pressure and little disturbance to soil structure [8].…”

Section: Introductionmentioning

confidence: 99%

Modified Maag’s Spherical Diffusion Model of Vacuum Penetration Grouting

Feng

Lyu

Gao

et al. 2018

Mathematical Problems in Engineering

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The penetration grouting is very widely used in geotechnical engineering nowadays, but the slurry diffusion radius is not long enough because of low grouting pressure. The vacuum grouting method is proposed to solve this problem. However, there is no diffusion theory model of vacuum grouting, which makes the practical application lack scientific basis. In this paper, the distribution law of vacuum negative pressure in soil is deduced. Then, the boundary conditions of Maag's spherical diffusion model are modified by the vacuum pressure distribution law. After that, the vacuum modification model is deduced. Finally, Maag's model and modified model are analyzed according to a published experiment, which proves that the vacuum modification model is suitable for predicting the slurry diffusion of vacuum grouting. The proposed model provides a reference for the theoretical study of vacuum grouting.

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Experimental investigation on sealing efficiency of chemical grouting in rock fracture with flowing water

Cited by 143 publications

References 18 publications

Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal

Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal

Experimental Investigation of Grout Nonlinear Flow Behavior through Rough Fractures

Modified Maag’s Spherical Diffusion Model of Vacuum Penetration Grouting

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