Grouting Material Development and Dynamic Grouting Test of Broken Rock Mass

Sun, Yanan; Zhang, Peisen; Yan, Wei; Wu, Junda; Yan, Fenqian

doi:10.1061/(asce)mt.1943-5533.0004190

Cited by 19 publications

(7 citation statements)

References 29 publications

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“…(1) The effect of single admixture addition on slurry performance (a) The effect of different water-cement ratio on slurry performance According to the <<Specification of mine curtain grouting>> [43][44][45], the water-cement ratios selected for this single-factor experiment ranged from 0.5, 0.6, 0.8, 1.0, and 2.0. After the slurry was completely mixed, the water separating proportion, viscosity, setting time, and compressive strength of the grouting stone body of the slurry were measured under different water-cement ratios, and the test results are shown in Figure 5.…”

Section: Single-factor Experimental Design and Results Analysis Of Gr...mentioning

confidence: 99%

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

et al. 2022

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Deep mining has started in the Huaibei mining area, and the serious threat of high confined water on the floor to the coal seam is gradually increasing. Based on the deep confined water mining project at working face II633 of the Hengyuan coal mine, this paper theoretically analyzes the damage depth of the floor and the risk of water inrush from the floor. The best proportion of grouting materials was quantitatively optimized by indoor experiments, and an industrial field test was conducted to judge the grouting effect. The results show that the failure depth of the bottom plate calculated by theoretical analysis is 31.73 m; a single factor test and a response surface optimization design method determined the best value of each index: water cement ratio 0.8, bentonite 2%, water reducer 0.6%, sodium silicate 2%. The damage depth of the bottom plate after grouting is 18.83~20 m, according to the field monitoring by the strain method. The optimized slurry significantly reduces the damage depth of the floor, ensures the safe and efficient mining of the coal seam above the high–pressure water, and has a high reference value for the safe mining of the coal seam under similar geological conditions.

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Section: Single-factor Experimental Design and Results Analysis Of Gr...mentioning

confidence: 99%

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

et al. 2022

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“…With regard to experimental design, highly mature methods include the uniform and orthogonal design methods, both of which can meet the basic needs of general experiments. For example, Sun et al analyzed the effects of different proportions of organic materials, such as fly ash, clay, water-based polyurethane and epoxy resin, on the performance of cement grouting through single-factor, orthogonal, and organic compound modification tests ( 19 ). In addition, a grouting simulation test system was used to verify the reinforcement effect of the prepared composite grout.…”

Section: Literature Reviewmentioning

confidence: 99%

Optimization of the Grout Mix Ratio and Simulation Test of Shield Tail Grouting Similarities in a Water-Rich Fine Sand Layer

Song,

Li,

Wang

et al. 2023

Transportation Research Record: Journal of the Transportation R

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When shield tunneling is performed in water-rich silt and fine sand strata, the grout becomes runny when diluted by groundwater. After dilution, the filling effect of the grout is not significant, and the level of surface settlement is very high. In this study, based on bidding section 04 of Tianjin Metro Line 11, traditional grouting materials were selected to conduct response surface method (RSM) tests. The purposes of the RSM analysis were to analyze the interactions between materials and their influences on grout performance and to optimize the grout mix ratio. Various admixtures were compared to assess the effects of different admixtures and compositions on the dispersion resistance and flow performance of the grout. Finally, a shield synchronous grouting test system was developed, and a similar indoor grouting simulation test was performed to analyze the influences of the different admixtures on the filling effects and to determine a reasonable grout mix ratio. The following three results were obtained. (1) The RSM was suitable for grout performance prediction and grout mix ratio optimization, and hydroxyethyl cellulose could improve the grout performance and increase the bond performance between the cementing material and aggregate. (2) Admixture incorporation enhancement could improve the grout utilization rate and increase the diffusion distance at the top of the tunnel, which would be conducive to filling the gap at the tail end of the shield. (3) The optimal preparation scheme of grout in water-rich fine sand formations included a water–binder ratio of 0.72, cement–sand ratio of 0.80, fly ash content of 5%, bentonite content of 14.94%, and admixture content of 0.8%–0.9%

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“…Grouting materials have undergone significant development since the introduction of pure clay slurry in the 19th century. Presently, grouting materials primarily include cement, cement-water glass, clay-cement, chemical grouting materials, and resins [6][7][8]. Among these, clay-cement grouting materials possess favorable attributes, including low cost, good stability, and strong anti-seepage performance [9,10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mechanical Properties of Clay–Cement Slurry Containing Graphene Oxide

et al. 2023

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As a widely used material in underground engineering, clay–cement slurry grouting is known for its initial poor anti-seepage and filtration capacity, the low strength of the resulting stone body, and its tendency towards brittle failure. To explore efficient and environmentally friendly grouting materials, industrial-grade graphene oxide (GO) was incorporated into a clay–cement slurry to create a new type of slurry called a GO composite. These GO composites were then utilized to reinforce fractured formations. Uniaxial compression tests, shear strength tests, permeability tests, and electron microscopy scans were conducted to investigate the strength, permeability, and microscopic features of the GO composite-reinforced fractured formations. Furthermore, the optimization effect and application prospects of graphene oxide on clay–cement slurry materials were evaluated. The experimental results demonstrated that the modified slurry effectively improved the compressive strength (increased by 7.2% to 32.5%) and shear strength (increased by 28.6% to 105.3%) of consolidated fractured gravel. By conducting orthogonal experiments with range analysis, variance analysis, and multiple regression analysis, it was shown that there was a strong correlation between the consolidated body and three factors influencing the permeability coefficient. Among these factors, the OPC content had the most significant impact on the permeability coefficient, followed by the GO content. Graphene oxide was found to promote cement hydration reactions, guide the growth of hydration products on the surface of graphene oxide nanosheets, optimize the pore structure in grouting materials, and reduce microcracks between the slurry and the fractured gravel interface. Electron microscopy characterization and fractal analysis revealed that the addition of graphene oxide effectively reduced the degree of microdamage during the sample’s failure process. This ensured the integrity of the sample during the unstable failure process, enhanced the material’s toughness, and improved its ability to resist loads.

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Grouting Material Development and Dynamic Grouting Test of Broken Rock Mass

Cited by 19 publications

References 29 publications

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

Optimization of the Grout Mix Ratio and Simulation Test of Shield Tail Grouting Similarities in a Water-Rich Fine Sand Layer

Experimental Investigation of Mechanical Properties of Clay–Cement Slurry Containing Graphene Oxide

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