The Calculation of Grouting Diffusion Radius on Based Bingham Fluid for Chunnel That Passes through Fractured Rock Mass

Wang, Lei; Li, Tao

doi:10.4028/www.scientific.net/amm.256-259.1280

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…A quasi-three-dimensional fracture grouting test system was developed for hydrodynamic conditions, the slurry diffusion rule was studied and the grouting plugging method of water inrush in fractured rock mass was put forward [32]. The grouting plugging mechanism of rock mass was studied by using a seepage grouting simulation test device with three-dimensional constant pressure [33].…”

Section: Introductionmentioning

confidence: 99%

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Zhai

Bai

2022

Mathematics

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Grouting is one of the main technical means to prevent water inrush hazards in coal seam floor aquifers. It is of great significance to elucidate the diffusion law of slurry in the process of grouting in fractured aquifers for safe mining in coal mines. In this paper, the mechanism of slurry diffusion in horizontal fractures of fractured aquifers was studied based on the Bingham slurry with time-varying characteristics; additionally, a one-dimensional seepage grouting theoretical model considering the temporal and spatial variation of slurry viscosity under constant grouting rate was established. In this model, the grouting pressure required by the predetermined slurry diffusion radius can be obtained by knowing the grouting hole pressure and injection flow. Slurry properties, fracture parameters, grouting parameters, and water pressure were the parameters affecting the slurry diffusion process. Looking at the problem of water disaster prevention of coal seam floor in the Working Face 2509 of the Chensilou Coal Mine, according to the aquifer parameters and model calculation results, a grouting scheme with a slurry diffusion radius of 20 m and grouting pressure of 12 MPa was proposed. Finally, with the comparative analysis of the transient electromagnetic method (TEM) and water inflow before and after grouting, it was verified that the design grouting pressure and the spacing of grouting holes were reasonable and the grouting effect was good.

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Section: Introductionmentioning

confidence: 99%

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Zhai

Bai

2022

Mathematics

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“…Although the rock strength will be improved after it is reinforced by common grouting materials such as cement slurry, polyurethane, and epoxy resin [4][5][6], different slurries exert different reinforcing effects on rocks or rock-like materials, and they differ in slurry groutability, initial strength and cohesiveness to rocks, etc. Among the factors influencing the grouting reinforcement, the slurry diffusion laws during the construction and slurry stability after the construction are also very important, so investigating the slurry diffusion laws under all kinds of conditions [7][8][9][10] and quantitatively evaluating the slurry stability [11] under different grouting parameters will be of great importance. As the geological environment for grouting is ever-changing, the individual demands for grouting materials in engineering are increasing year by year, and regarding slurry groutability, controllability, stability, and durability and economical efficiency, many scholars have developed newtype grouting materials, made modifications, and achieved abundant results [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Characteristics of Fractured Rock Reinforced by Different Grouts

Kao

Zhao

Meng

et al. 2021

Advances in Civil Engineering

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In order to investigate the dynamic mechanical properties of the fractured rocks reinforced with different slurries, the prefractured and grouted sandy mudstone specimens were tested on a Split Hopkinson Pressure Bar (SHPB), and their dynamic failure processes were shot via a high-speed camera. The test results showed that under dynamic loading, grouting reinforcement can relieve the rock failure at the fracture part. With the increase of the impact speed, the dynamic specific strength of the modified epoxy resin grouting increases from 0.85 to 1.01, and its specific strain rate increases from 1.09 to 1.04; the dynamic specific strength and specific strain rate of cement slurry grouting increase from 1.78 to 0.95 and from 0.60 to 0.98, respectively. As a whole, the specimen reaches or approaches the dynamic parameters of the intact rock specimen after grouting repair, the stability of the rock reinforced by modified epoxy resin grouting is superior to that of the rock reinforced by cement slurry grouting, and the latter can acquire high dynamic strength under low-speed impact. The improved damage-type Zhuwangtang (ZWT) model can be used to describe the dynamic mechanical behaviors of the fractured rocks reinforced by grouting very well.

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“…For the present, based on the grouting diffusion model derived from the diffused single plate fracture, the grout is mainly taken as the Newtonian, the Bingham Body [6] [7] to diffuse in the fractured network of rock mass, which is of high practicalities towards the cement slurry with high water ratio, clay slurry and the chemical slurry.…”

Section: Introductionmentioning

confidence: 99%

The Grouting Diffusion Model of Power-Law Fluid in Single Fracture

Zhang

2013

AMM

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Based on the Hele-Shaw smooth flat model, the theoretical model of the diffusion radius-time relationship of the power-law fluid in single fracture plate model can be deduced according to the force balance of fluid micro element in cylindrical coordinate, the rheological equation of power-law fluid and the equation of mass conservation. The calculation procedures of the derived theoretical model are compiled by applying the Matlab software, and are employed to analyze the affecting elements of diffusion. The results show that the slurry diffusion radius is widened with the increase of the fracture apertures, the grouting pressure difference and the grouting time; and the bigger the water cement ratio, the easier the grouting spreads under the equivalent fracture opening conditions. The grouting infection efficiency in the early stage is much higher than that of the later stage, and reduces with the increase of the diffusion radius, which is in accord with the rule of the grouting in practice. The Grouting Diffusion Model will serve as a theoretical basis for the cement grout with low water cement ration in the fractured rock.

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The Calculation of Grouting Diffusion Radius on Based Bingham Fluid for Chunnel That Passes through Fractured Rock Mass

Cited by 3 publications

References 1 publication

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Dynamic Mechanical Characteristics of Fractured Rock Reinforced by Different Grouts

The Grouting Diffusion Model of Power-Law Fluid in Single Fracture

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