Research on the Fracture Grouting Mechanism and PFC Numerical Simulation in Loess

Zhang, Zhenlong; Shao, Zhushan; Fang, Xiaobo; Liang, Xijun

doi:10.1155/2018/4784762

Cited by 12 publications

(11 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Researchers began to simulate the diffusion process of grouting cement grout from the perspective of micro-mechanics. Among them, Zhang et al (2018a, b, c), Liu et al (2019), Zheng et al . (2021), Yu et al (2021) and Li (2020) respectively used the particle flow DEM software PFC 2D/3D to explain the cement grout diffusion range and pressure law during grouting.…”

Section: The Research Status On Numerical Simulation Of Rock Groutingmentioning

confidence: 99%

“…In contrast, micro fractures cannot be injected. Zhang et al (2018a, b, c) introduced the two-stage governing equation of fracture deformation and established a theoretical model of fracture grouting diffusion considering the coupling effect of cement grout and rock. They also indicated that the smaller the crack width, the more significant the effect of fluid–solid coupling on the grouting diffusion process, which is consistent with Zheng's results.…”

Section: The Research Status On Numerical Simulation Of Rock Groutingmentioning

confidence: 99%

“…The porous media model regards rock mass as composed of many pore structures to study cement grout's flow and diffusion law in porous media, which is more suitable for sandstone and gravel strata (Zhang et al , 2018a, b, c). This model is also the earliest applied and developed model in rock mass grouting theory.…”

Section: The Research Status On Numerical Simulation Of Rock Groutingmentioning

confidence: 99%

See 2 more Smart Citations

The numerical simulation of rock mass grouting: a literature review

Tong

Yang

Duan

et al. 2021

View full text Add to dashboard Cite

PurposeThe purpose of this article is to understand the current research status and future development trends in the field of numerical simulation on rock mass grouting.Design/methodology/approachThis article first searched the literature database (EI, Web of Science, CNKI, etc.) for keywords related to the numerical simulation of rock mass grouting to obtain the initial literature database. Then, from the initial database, several documents with strong relevance to the numerical simulation theme of rock mass grouting and high citation rate were selected; some documents from the references were selected as supplements, forming the sample database of this review study (a total of 90 articles). Finally, through sorting out the relationship among the literature, this literature review was carried out.FindingsThe numerical simulation of rock mass grouting is mainly based on the porous media model and the fractured media model. It has experienced the development process from Newtonian fluid to non-Newtonian fluid, from time-invariant viscosity to time-varying viscosity, and from generalized theoretical model to engineering application model. Based on this, this article summarizes four scientific problems that need to be solved in the future in this research field: the law of grout distribution at the cross fissures, the grout diffusion mechanism under multi-field coupling, more accurate grouting theoretical model and simulation technology with strong engineering applicability.Originality/valueThis research systematically analyzes the current research status and shortcomings of numerical simulation on rock mass grouting, summarizes four key issues in the future development of this research field and provides new ideas for the future research on numerical simulation on rock mass grouting.

show abstract

Section: The Research Status On Numerical Simulation Of Rock Groutingmentioning

confidence: 99%

Section: The Research Status On Numerical Simulation Of Rock Groutingmentioning

confidence: 99%

Section: The Research Status On Numerical Simulation Of Rock Groutingmentioning

confidence: 99%

See 1 more Smart Citation

The numerical simulation of rock mass grouting: a literature review

Tong

Yang

Duan

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Although some scholars have carried out research on seepage grouting and splitting grouting, overall, the theoretical research on grouting engineering lags far behind engineering practice. In particular, there is a lack of systematic experimentation and research in the field of filling soil grouting; therefore, experience is often needed in grouting design, construction, and the evaluation of grouting effects, presenting an urgent problem to be solved [4,5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation

Niu

et al. 2020

Sensors

View full text Add to dashboard Cite

In view of the deficiency of the split grouting theory for the filling area, a 3D simulated grouting test system was designed to explore the slurry diffusion law, reinforcement mechanism of split grouting in a filling soil, and effect of grouting reinforcement. The test system included an experiment bench system, grouting system, and information monitoring system, using which experimental research on split grouting in a filling soil was conducted. The grouting model experiment procedure was introduced first, following which the diffusion rule of slurry in the filling medium and the reinforcement mechanism of split grouting were analyzed according to the properties and distribution characteristics of grouting veins after grouting reinforcement. Finally, a uniaxial compression test, light dynamic contact test, permeability test, and laboratory geotechnical test were conducted on the soil before and after grouting. The relationship between the zoning characteristics of different properties of veins and the mechanical properties of filling soil were discussed. The results showed that there were three types of grouting veins: trunk grouting, branch grouting, and permeable grouting. The injected soil body was strengthened by the three-stage grouting vein network of the mentioned vein types and the compaction between soils. After the grouting, the uniaxial compressive strength of the filling soil increased by an average of 186%, and the permeability coefficient decreased by an average of 47 times. The cohesion and internal friction angle increased by 45.3% and 44.9%, respectively. Additionally, density, water content, and other indicators of filling were improved. The bearing characteristics reflected by a dynamic contact test were consistent with the distribution of grouting veins. The research results offer significant guidance for the reinforcement mechanism of split grouting and the evaluation of the grouting effect.

show abstract

“…The diffusion form of grout in coal seam cracks is di cult to obtain through laboratory tests or eld measurements. The PFC particle ow simulation method has been applied in many studies conducted in China and abroad (Sun et al2010;Yuan et al2011;Geng et al2012;Zhang and Shao 2018;Lei and Latham 2016). This method can reveal the mechanical law and coupling mechanism of the grouting process from a microscopic perspective, re ect the relationship between the macroscopic performance of grouting and the microscopic characteristics of the coal body, and simulate the crack expansion under different grouting pressures.…”

Section: Introductionmentioning

confidence: 99%

Study on the macro and micro grouting process and the influence mechanism of cracks in soft coal seam

Yu¹,

Jia²,

Liu³

et al. 2020

Preprint

View full text Add to dashboard Cite

Grouting is an important method to reinforce soft coal roadway, and the presence of primary cracks in the coal body has an important influence on the grouting effect. Using the PFC (Particle Flow Code) method, the grouting process of the soft coal seam was simulated. The mechanism of primary cracks on grouting was revealed, while the influence of fracture characteristics and grouting pressure on the grouting effect was analyzed. The results demonstrated that grouting in the soft coal seam involved the stages of seepage, rapid splitting, slow splitting, and stability. Due to the presence of primary cracks, the grouting diffusion radius increased significantly. Under the slurry pressure, the tensile stress concentration was formed at the crack tip, and the slurry split the coal once the splitting pressure was reached. In addition, the distribution characteristics of fractures were found to have a great influence on the grouting effect. It was observed that smaller fracture spacing was associated with a larger slurry diffusion radius and thus easier penetration of the primary crack tips. The fracture angle affected the direction of fracture propagation. The secondary fracture formed by splitting was a tensile fracture, which was more likely to extend along the direction parallel to the maximum principal stress. Overall, these simulation results have guiding significance for the setting of reasonable spacing of grouting holes in the practice of grouting engineering.

show abstract

Research on the Fracture Grouting Mechanism and PFC Numerical Simulation in Loess

Cited by 12 publications

References 1 publication

The numerical simulation of rock mass grouting: a literature review

The numerical simulation of rock mass grouting: a literature review

Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation

Study on the macro and micro grouting process and the influence mechanism of cracks in soft coal seam

Contact Info

Product

Resources

About