New Algorithm for Simulating Grout Diffusion and Migration in Fractured Rock Masses

Liu, Bin; Sang, H.; Liu, Quansheng; Kang, Yongshui; Pan, Yucong; Lu, Chaobo; Zhang, Chuanqing

doi:10.1061/(asce)gm.1943-5622.0001537

Cited by 13 publications

(8 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, certain scholars have systematically analyzed the grouting effect through numerical analysis. This approach makes the migration of grouting in the ideal state more intuitive and reveals that grouting can change the permeability and porosity of rock, change the crack and pore size distribution of rock, and also improve the compactness and strength of fractured rock. − Other scholars considered the theoretical basis of fluid mechanics and the distribution state of cracks and established analytical formulas such as grouting diffusion range and diffusion speed. − To evaluate the rock strength after grouting, Zhang et al established a preliminary theoretical model and an empirical formula for rock strength after grouting, which enabled prediction of the rock strength after grouting. In summary, scholars worldwide mainly use theoretical analysis, experimental analysis, and numerical simulation to evaluate the slurry diffusion and the effect of rock mass reinforcement, which greatly enriches and develops grouting theory.…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution of the Grouting Reinforcement Response of a Circular Cavern in Deeply Buried Fractured Surrounding Rock under a Nonuniform Stress Field

Liu

Lyu

et al. 2022

ACS Omega

View full text Add to dashboard Cite

Grouting is widely utilized to reinforce fractured surrounding rock. However, presently, the secondary stress distribution of fractured surrounding rock after grouting is not distinct, which hinders the accurate evaluation of the grouting effect. Therefore, a complex variable function solution is provided for the evolution of the stress field and the displacement field around the reinforced fractured surrounding rock subjected to a nonuniform load. By comparing the evolution of the stress and radial displacement fields around the cavern, the reinforcement effect on the fractured surrounding rock is quantitatively confirmed. The results show that grouting has an obvious modification effect on fractured surrounding rock: its radial stress and circumferential stress fields are affected to different degrees, and the circumferential stress is more obvious. Grouting makes the circumferential stress peak transfer from the wall of the cavern to the roof and floor of the cavern, which is beneficial to the stability of the cavern. The radial displacement around the cavern also decreases. The displacement of the wall decreases by approximately 24.0%, and the radial displacement of the roof and floor decreases by approximately 61.8%.

show abstract

Section: Introductionmentioning

confidence: 99%

Analytical Solution of the Grouting Reinforcement Response of a Circular Cavern in Deeply Buried Fractured Surrounding Rock under a Nonuniform Stress Field

Liu

Lyu

et al. 2022

ACS Omega

View full text Add to dashboard Cite

show abstract

“…As an important method to study the grouting problem, numerical simulation has become a good supplement to model experiment and field research in recent years. 23,24 At present, the numerical simulation of grouting is mainly based on the CFD theory. 25 The slurry and water are regarded as independent phases, and the flow process of slurry is solved in a two-phase system.…”

Section: Introductionmentioning

confidence: 99%

“…As an important method to study the grouting problem, numerical simulation has become a good supplement to model experiment and field research in recent years 23,24 . At present, the numerical simulation of grouting is mainly based on the CFD theory 25 .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Pan

Zhang

et al. 2023

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

In order to investigate the slurry flow behavior, our newly proposed numerical method is applied to simulate the fracture grouting with flowing water condition. First, by numerical validation and experiment comparison, the advantages of this method in computation efficiency and accuracy are shown. Second, the initial velocity of water and slurry properties at different levels are selected as the influencing factors, the water reduction effect, grouting pressure, and slurry deposition behavior in different cases are investigated, and the variation characteristics of flow field and slurry outflow are analyzed. The simulation results show that within the range of slurry properties and flow velocity given in this paper, cement slurry cannot seal the water inflow. Instead, quick setting slurry with different material ratios can effectively seal the fracture. The sealing efficiency is more sensitive to the initial flow rate than the slurry property. When the groundwater flow rate is low, the effect of slurry proportion on sealing can be ignored. Meanwhile, slurry properties have more influence on the final grouting pressure. There is an obvious surge in grouting pressure after sealing, which can be used as a criterion for fracture sealing.

show abstract

“…12,13 Since grouting technology is used in underground engineering and forms a concealed structure, there is no effective means to monitor and evaluate the reinforcement effect of grouting. 14 Therefore, it is crucial to study the flow diffusion mechanism of cement slurry in the reserved space for grouting and the effect of penetration and reinforcement in the soil around the piles. 4,15,16 The flow diffusion mechanism of the slurry in the reserved space for grouting should be studied to evaluate the corresponding grouting effect.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of slurry flow in pile‐end grouting of the drilling with prestressed concrete pipes

Wang,

Cui,

Shan

et al. 2023

Structural Concrete

View full text Add to dashboard Cite

Understanding the diffusion law of cement slurry is the key to analyzing and evaluating the reinforcement effect of grouting. This study aimed to reveal the flow grouting mechanism of slurry in the reserved space between piles and soil and the penetration diffusion rule of slurry in the soil around the piles. For this purpose, the grouting slurry was regarded as a Newtonian fluid. The Navier–Stokes equations of fluid mechanics and renormalization group k–ε model were used to study the flow diffusion of slurry in the reserved space around a pile for grouting the drilling with prestressed concrete pipes. The permeability of soil slurry was determined using Darcy's law, and the flow field of slurry during grouting was numerically simulated. The results showed that the flow velocity of slurry and the reinforcement effect of grouting decrease gradually as the flow path extends. The radial flow of slurry in the grouting pipe shows a clear trend of circumferential diffusion. The slurry thickness in the reserved space for grouting decreases with an increase in the distance from the grouting outlet. Its attenuation trend becomes more obvious with increasing grouting height. The grouting thickness directly reflects the filling effect of slurry and is an important index to evaluate the grouting effect of drilling with prestressed concrete pipes.

show abstract

New Algorithm for Simulating Grout Diffusion and Migration in Fractured Rock Masses

Cited by 13 publications

References 45 publications

Analytical Solution of the Grouting Reinforcement Response of a Circular Cavern in Deeply Buried Fractured Surrounding Rock under a Nonuniform Stress Field

Analytical Solution of the Grouting Reinforcement Response of a Circular Cavern in Deeply Buried Fractured Surrounding Rock under a Nonuniform Stress Field

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Numerical analysis of slurry flow in pile‐end grouting of the drilling with prestressed concrete pipes

Contact Info

Product

Resources

About