Tail void grouting material: A parametric study on the role of hydro-mechanical characteristics in mechanized tunneling

Mohammadzamani, Danial; Lavasan, Arash Alimardani; Wichtmann, Torsten

doi:10.1016/j.tust.2023.105053

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…Therefore, up to now, there has not been an authoritative theory for grouting in rock fissures. In order to make clear the specific flow situation of slurry inside fissures, domestic and foreign scholars have carried out a series of theoretical derivation of seepage [16,17], and conducted rich indoor grouting simulation research in fissured rock masses [18][19][20]. Hexuan Zhu et al [21] used CT scanning technology to select single fracture samples with similar three-dimensional fractal dimensions but different dip angles.…”

Section: Introductionmentioning

confidence: 99%

Study on Seepage Characteristics of Grouting Slurry for Water-Absorbing Mudstone with Rough Fissure

Chen,

Zhou,

Zhang

et al. 2024

Materials

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Based on the computed tomography scanning, which abbreviation is CT scanning, and fractal theory, geometric parameters of mudstone fissures are obtained. The physical model of a single fissured channel is obtained in combination with Barton standard curves and 3D printing technology, and similar materials of mudstone are developed based on the water absorption of natural mudstone to prepare single fissured water-absorbing grouting test blocks with different roughness levels for the grouting simulation testing. By analyzing the viscosity change characteristics of grouting slurry before and after grouting, the seepage characteristics of the grouting slurry in the rough fissures of the water-absorbing mudstone are revealed. The results show that when the roughness is small, the grouting slurry will have an obvious water loss effect after passing through mudstone fissures. However, with the flow of the slurry, the water loss effect of the subsequent grouting slurry will be weakened. For fissures with high roughness, the water absorption properties of the rough surfaces and the walls of the mudstone fissures work together, leading to the sedimentation and blockage of the fissure channels, thereby hindering the flow of slurry.

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Section: Introductionmentioning

confidence: 99%

Study on Seepage Characteristics of Grouting Slurry for Water-Absorbing Mudstone with Rough Fissure

Chen,

Zhou,

Zhang

et al. 2024

Materials

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“…Mohammadzamani et al [23] investigated the effect of the hydro-mechanical properties of the injection material on both the short-term and long-term behavior of the tunnel. Various properties of the injection material are examined in this study using a three-dimensional Finite Element method, including the thickness of the injection layer, permeability, stiffness, hardening ratio (E1 (the initial stiffness)/E28 (the final stiffness of the grouting material)), shrinkage, and creep behavior.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Feasibility of Increasing the Tail-grouting Zone during Mechanized Tunneling in Sandy Soils

Barri,

Chakeri,

Haghkish

et al. 2023

Period. Polytech. Civil Eng.

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Nowadays, excavation in urban environments can have many risks; one of these hazards is improper tail-grouting of Earth Pressure Balance Machine (EPBM) and the consequent ground surface settlement. Failure to fill the tail space with suitable grout significantly affects the surface displacements. Injecting more grout to penetrate deeper around the tunnel will play a more effective role in reducing displacements and permeability of the soil. Therefore, experimentally investigation of the feasibility of increasing the tail-grouting zone during excavation around the tunnel space and the effect of this penetration on the amount of ground surface displacements is the main purpose of this paper. Thus, experimental tests were performed with different grout injection pressure and the effect of each of the pressure on the penetration depth of grout into the soil new laboratory model were examined. Then to study the effect of the grout penetration depth on surface settlement to determination of the adequate amount of grout injection pressure a numerical modeling of Tabriz metro line 2 by FLAC3D software were completed. For this purpose, the results of the laboratory tests (the penetration depth of grout) were used in numerical modeling. The results indicated that the amount of penetration in the implemented granulation has increased due to the increase in pressure, so doubling the pressure causes a 30% increase in grout penetration in the surrounding soil. The results of numerical studies showed that increasing the range of injection in the modeling causes a significant reduction (80 percent) in the ground surface settlement.

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“…However, how to use ground penetrating radar and a high-density electrometer to evaluate the grouting effect after polyurethane composite materials' grouting deserves our exploration and study. Researchers modified asphalt by adding polymers to improve the road performance of asphalt [19][20][21]. After the use of rubber as an asphalt modifier, more and more polymers have been used in the field of modified asphalt [22][23][24][25] whose properties are different, and their modification effects on asphalt are different.…”

Section: Introductionmentioning

confidence: 99%

Grouting Mechanism of Polyurethane Composite Materials in Asphalt Pavement Subsidence

Ran,

Zhou,

Yan

et al. 2023

Materials

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The mechanical properties of polyurethane grouting materials were significantly improved when cement, sodium meta-silicate, red mud, slag, and fly ash were added. However, the grouting mechanisms of polyurethane composite materials are not clear. The grouting mechanisms of polyurethane composite materials in asphalt pavement subsidence were investigated. The results of computed tomography analysis show that polyurethane foam is filled with geopolymer hydration products. The results from ground penetrating radar after grouting show that mapping has no significant fluctuation or dislocation effect, which indicates that the grouting effect is strong. The high-density electrometer can also test the pavement subsidence place and distribution. The grouting mechanisms indicate that polyurethane foam acts as the consolidation structure, and the geopolymer filled with the foam pores of polyurethane and geopolymer forms a stable consolidated body. The seriflux includes under-layer seriflux (red mud, slag, water, and polyurethane composite materials) and upper-layer seriflux (polyurethane seriflux), and there exists a weak phase separation phenomenon, in which the separation phase is mainly polyurethane with little red mud-based geopolymer.

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Tail void grouting material: A parametric study on the role of hydro-mechanical characteristics in mechanized tunneling

Cited by 9 publications

References 13 publications

Study on Seepage Characteristics of Grouting Slurry for Water-Absorbing Mudstone with Rough Fissure

Study on Seepage Characteristics of Grouting Slurry for Water-Absorbing Mudstone with Rough Fissure

Investigation of the Feasibility of Increasing the Tail-grouting Zone during Mechanized Tunneling in Sandy Soils

Grouting Mechanism of Polyurethane Composite Materials in Asphalt Pavement Subsidence

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