Development of a numerical model for grout injection and its application to the<i>in situ</i>grouting test at the Grimsel test site, Switzerland

Koyama, Tomofumi; Katayama, T.; Tanaka, Tatsuya; Kuzuha, Yuji; Ohnishi, Yuzo

doi:10.1080/12269328.2013.780766

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…Three cement grouts are prepared with distinct water-cement ratios 1.0, 0.8, and 0.6 and corresponding densities 1485 kg/m 3 , 1530 kg/m 3 , and 1630 kg/m 3 , respectively; the molarities of tricalcium silicate were calculated to be 1628 mol/m 3 , 1864 mol/m 3 , and 2234 mol/m 3 , respectively (calculated according to the proportion of tricalcium silicate is 50%). An NDJ-5T rotational viscosimeter was adopted to test the time-varying data of viscosity, and the linear interpolation algorithm [36] is adopted to drive the 3D surface functions of grouting material viscosity versus time and molarity:…”

Section: Influence Characteristics Of Grouting Materials' Physical Pr...mentioning

confidence: 99%

Advanced Grouting Model and Influencing Factors Analysis of Tunnels with High Stress and Broken Surrounding Rock

Jiang

Pan²,

Zhang³

et al. 2022

Water

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Grouting can effectively seal and reinforce broken rock masses in deep geotechnical engineering, which have an important impact on groundwater-related disaster prevention and control. Based on multi-field coupling mechanics and rotational viscosity experiments, an advance grouting migration model of cement slurry in tunnels with high-stress broken surrounding rock is built against the background of the Xianglushan Tunnel for water diversion in central Yunnan Province. The influence characteristics of water–cement ratio, grouting pressure, and initial permeability on the process of grouting material migration are analyzed by combining classical column theory and spherical theory. The results show the following: Overall, the growth rate of grouting radius is fast during the earlier 5 min and slows down later. At the fifth minute, the normal grouting ranges are 22 cm, 51 cm, and 58 cm, at water–cement ratios 0.6, 0.8, and 1.0, respectively, while the normal grouting ranges are 58 cm, 51 cm, and 36 cm at grouting pressures 2 MPa, 1 MPa, and 0.5 MPa, respectively; the normal grouting ranges are 58 cm, 24 cm, and 11 cm at initial permeabilities 5D, 0.5D, and 0.05D, respectively. At the 60th minute, the normal grouting ranges are 47 cm, 133 cm, and 155 cm at water–cement ratios 0.6, 0.8, and 1.0, respectively; the normal grouting ranges are 155 cm, 131 cm, and 96 cm at grouting pressures 2 MPa, 1 MPa, and 0.5 MPa, respectively; meanwhile, the normal grouting ranges are 155 cm, 63 cm, and 29 cm at initial permeabilities 5D, 0.5D, and 0.05D, respectively. This study can provide theoretical guidance for on-site grouting design in unfavorable geological treatment projects.

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Section: Influence Characteristics Of Grouting Materials' Physical Pr...mentioning

confidence: 99%

Advanced Grouting Model and Influencing Factors Analysis of Tunnels with High Stress and Broken Surrounding Rock

Jiang

Pan²,

Zhang³

et al. 2022

Water

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“…By using the linear interpolation algorithm [29], the three-dimensional surface equation of grout with respect to time and concentration can be obtained: μ c, t ð Þ= 7:32 × 10 −13 e t/1309:55 + 7:71 × 10 −3 − 0:001…”

Section: Influence Of Physical Properties Of Silica Sol Onmentioning

confidence: 99%

Numerical Simulation of Nanosilica Sol Grouting for Deep Tunnels Based on the Multifield Coupling Mechanism

Pan

Hong²,

et al. 2021

Geofluids

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Grouting is an effective technical way for the construction of deep tunnels in unfavorable geological conditions. The fluid-solid-chemical coupling mechanism of grouting process is analyzed from the following three aspects: influence of physical properties of silica sol on permeability coefficient, dynamic changes of porosity and permeability of geotechnical media with seepage pressure, and governing equations for flow and mass transfer characteristics. A dynamically changing model for nanosilica sol grouting in deep tunnels is established, considering the changing physical properties of grout and surrounding rock. Based on the Xianglushan Tunnel of Yunnan Water Diversion Project, the temporal and spatial evolution of silica sol grout is studied. The effect characteristics of grouting pressure and initial permeability are clarified. The rationality of this model is verified by classical Newtonian fluid grouting theory. The main conclusions: with the molar concentration as the index, the grout range can be divided into the raw grout region and the transition region; with the decrease of the grouting pressure, the growth rate of the normal grouting radius and the axial grouting radius will gradually decrease; due to the mechanical dispersion and molecular diffusion, the range of the transition region will gradually increase with time. The ratio of the transition region to grouting radius fluctuates slightly with time under the initial permeability of 5 D. The fluctuation increases with the decrease of initial permeability, and the average ratio increases with the decrease of grouting pressure. This study can provide theoretical guidance for grouting design of deep tunnel engineering.

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“…Sarris et al [17] investigated the main parameters that influence the propagation of a fluid-driven fracture in a poroelastoplastic continuum. Koyama et al [18] developed a three-dimensional numerical model based on an equivalent continuum approach to simulate grout injection. Guo et al [19] used a finite element software to implement two and three-dimensional numerical models for grouting of intersected fractures in hydrostatic conditions.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Clay Soils through Fracture Grouting

Cheng¹,

Chen²,

Xue³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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Fracture grouting is widely used for building foundation reinforcement, however the underpinning mechanisms are still not clear. Using numerical results about a single-hole fracture grouting process as a basis, a model composed of soil and grouting veins has been created to analyze the reinforcement mechanism. The influence weights of the grouting vein skeleton and compaction effect have been studied, thereby obtaining relevant information on the compressive modulus of the considered composite soil. The research results show that the compaction effect plays a leading role in the soil fracture grouting reinforcement. The grouting pressure, the hardened grouting vein modulus, and the shape of the grouting veins all influence the compressive modulus of the composite soil.

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Development of a numerical model for grout injection and its application to thein situgrouting test at the Grimsel test site, Switzerland

Cited by 10 publications

References 3 publications

Advanced Grouting Model and Influencing Factors Analysis of Tunnels with High Stress and Broken Surrounding Rock

Advanced Grouting Model and Influencing Factors Analysis of Tunnels with High Stress and Broken Surrounding Rock

Numerical Simulation of Nanosilica Sol Grouting for Deep Tunnels Based on the Multifield Coupling Mechanism

Reinforcement of Clay Soils through Fracture Grouting

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