Grouting Simulation and Stability Analysis of Coal Mine Goaf Considering Hydromechanical Coupling

Ao, Xuefei; Wang, Xiaoling; Zhu, Xiaobin; Zhou, Zhengyin; Zhang, Xiao‐Xin

doi:10.1061/(asce)cp.1943-5487.0000640

Cited by 31 publications

(25 citation statements)

References 23 publications

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“…Kim et al [9] used UDEC to simulate the flow of Bingham grout in a single joint with smooth parallel surfaces and considered the hydromechanical coupling to study its effect on grouting performance. Ao et al [10] simulated the grouting process in underground goaf and analyzed the stability by applying one-way fluid-structure interaction. Liu et al [11] combined a finite-discrete element method (FDEM) and a grouting flow simulator to consider the hydromechanical coupling effect in the parallel-plate model.…”

Section: Of 19mentioning

confidence: 99%

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

et al. 2019

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Grouting has always been the main engineering measure of ground improvement and foundation remediation of hydraulic structures. Due to complex geological conditions and the interactions between the grout and the fractured rock mass, which poses a serious challenge to the grouting diffusion mechanism analysis, fracture grouting has been a research hotspot for a long time. In order to throw light on the grout diffusion process in the fractured rock mass and the influence of grout on the fracture network, and to achieve more realistic grouting numerical simulation, in this paper a grouting process simulation approach considering fluid–structure interaction is developed based on the 3D fractured network model. Firstly, the relationship between fracture apertures and trace lengths is used to obtain a more realistic value of fracture aperture; then a more reliable model is established; subsequently, based on the 3D fracture network model, different numerical models are established to calculate fluid dynamics (grout) and structure deformation (fractured rock mass), and the results are exchanged at the fluid–structure interface to realize the grouting process simulation using two-way fluid-structure interaction method. Finally, the approach is applied to analyze the grouting performance of a hydropower station X, and the results show that the grouting simulation considering fluid–structure interaction are more realistic and can simultaneously reveal the diffusion of grout and the deformation of fracture, which indicates that it is necessary to consider the effect of fluid–structure interaction in grouting simulation. The results can provide more valuable information for grouting construction.

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Section: Of 19mentioning

confidence: 99%

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

et al. 2019

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“…As the key and core factor, the comprehensive performance of grouting material will significantly affect the flow and diffusion range of slurry and ultimately determine the grouting reinforcement effect of the roadway. At present, many scholars have carried out effective research on grouting materials and developed grouting materials with different types and properties [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. It can be divided into inorganic cement slurry and organic chemical slurry: (1) Inorganic cement slurry has the advantages of wide source, high strength of stone body, good impermeability, low price, convenient preparation, simple operation, nontoxic, and harmless.…”

Section: Introductionmentioning

confidence: 99%

Development of Modified Grouting Material and Its Application in Roadway Repair Engineering

Qin

Wang

et al. 2021

Geofluids

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It is very extraordinary for the success of coal mine roadway grouting with the following factors of high early strength, good fluidity, and convenient pumping, but the existing grouting materials make it difficult to achieve the above characteristics at the same time. Therefore, a modified grouting material is developed, which is composed of two kinds of dry materials A and B, which are mixed with water and in equal amounts. The physical and mechanical properties of modified grouting materials under different ratios were tested by laboratory orthogonal test, and the optimal ratio of grouting materials and additives was obtained: (1) the water-cement ratio is 0.8 : 1; (2) base material: the mass ratio of cement, fly ash, bentonite, and water is 1 : 0.3 : 0.1 : 1.44; (3) admixture: the mass ratio of water reducer C, accelerator D, and retarder E is 1.5% : 0.05% : 0.3%. The basic properties of the modified grouting materials were studied from the aspects of slurry flow state, diffusion range, and grouting parameters by using the numerical simulation method, and the reinforcement mechanism of slurry to the broken surrounding rock properties of the roadway was revealed: (1) the grouting pressure is the main factor affecting the slurry diffusion radius; (2) the mechanical properties of the roadway surrounding rock are improved, the plastic zone and deformation of surrounding rock are reduced, and the active support function of the anchor and cable is enhanced through grouting reinforcement; (3) the control effect of the roadway is improved, and the balanced bearing with anchorage structure of the roadway surrounding rock is realized through grouting reinforcement. On this basis, the modified grouting material is applied to roadway repair and reinforcement engineering practice. The field monitoring data show that the production practices were guided by roadway repair and reinforcement technology with the modified grouting material, as the core of the roadway surrounding rock control effect is good, and the modified grouting material has a wide range of application prospects.

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“…e grouting material can be injected into the fracture network to fill and bond defects through the effect of pump pressure. Filling and bonding enhance the strength and stability of broken coal masses by increasing the occlusion strength of fracture surfaces and by bonding broken coal into a continuous mass [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of a Polymer Foaming Agent as a Grouting Material for Broken Coal Masses

Sun

Zhang

Sun

2019

Advances in Civil Engineering

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A new soluble polymer foaming (PF) grouting material was developed by using hydrophilic amino resin as the base material and adding other cross-linking, foam, foam stabilizing, toughening, and coupling agents. The PF material exhibited low viscosity, excellent adhesion, and strong penetration. The grouting reinforcement effect of the proposed PF material on broken coal masses was investigated and compared with that of traditional superfine cement (SC) through simulation experiments. Results showed that after grouting, fractures, joints, and other failure planes inside raw coal were filled and bonded, and the mechanical strength of the grout-coal concretion improved relative to the residual strength of raw coal. The average uniaxial compressive strength of SC specimens was 6.16 MPa, whereas that of PF specimens was 10.85 MPa. Moreover, the PF specimens presented an obvious characteristic of plastic strengthening. Analyzing the reinforcement effect of the grouting materials on the basis of single structural plane theory revealed that at the critical state, the average σ3 value of SC specimens was 1.43 MPa, whereas that of PF specimens was 3.09 MPa. In addition, coordination between the lateral and axial deformations of the PF specimens during compression promoted the formation of a bearing structure that can adapt to deformation. This structure is crucial for the safe operation of coal mines.

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Grouting Simulation and Stability Analysis of Coal Mine Goaf Considering Hydromechanical Coupling

Cited by 31 publications

References 23 publications

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

Development of Modified Grouting Material and Its Application in Roadway Repair Engineering

Feasibility of a Polymer Foaming Agent as a Grouting Material for Broken Coal Masses

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