Numerical Study on the Effectiveness of Grouting Reinforcement on the Large Heaving Floor of the Deep Retained Goaf-Side Gateroad: A Case Study in China

Zhang, Zhiyi; Shimada, Hideki

doi:10.3390/en11041001

Cited by 25 publications

(14 citation statements)

References 23 publications

(23 reference statements)

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“…e control methods of floor heave in different situations are also different [24,25]. Zhang et al proposed the grouting reinforcement method for the large floor heave of the retained goaf-side gate road [26]. Wang et al analyzed the influencing factors of the floor heave of the roadways in the fault-fractured zone, including the influence of the faultfractured zone, the poor quality of floor rock masses, the deterioration of soaked floors, and weak floor supports.…”

Section: Introductionmentioning

confidence: 99%

Collaborative Control Technology of Crosscut Floor Heave in Soft Rocks under Deep High Horizontal Stress

Liu

Zhai

et al. 2022

Mathematical Problems in Engineering

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The repair rate of deep permanent roadways is about 90%, and most of which are projects treating floor heave. The deformation behaviors of crosscut were analyzed in the work according to a trackage crosscut at the shaft station of Panyidong Coal Mine in Huainan, China. Crosscut has complex characteristics such as globality, difference, and rheology under deep stress because that crosscut passes through multiple strata. The mechanism of crosscut floor heave was studied based on on-site in situ stress tests and surrounding rock composition tests. The floor heave of trackage crosscut is water swelling in the mudstone and sandy-mudstone areas where the mineral components are mainly kaolinite and illite mixed layers. In the areas of fine and medium-fine sandstone, trackage crosscut is in shear dislocation under high horizontal stress. The slip-line field theory was used to study the ultimate load and maximum failure depth of crosscut floor heave. According to the deformation characteristics of crosscut floor heave, a collaborative control technology enhancing the bearing structure of all-sided surrounding rocks was proposed, including filling of the U-shaped steel supports, shallow grouting in the all-sided surrounding rocks and deep grouting in the floor and inverted arches. A support scheme for repairing the floor was designed based on the specific engineering geology of trackage crosscut floor heave at the shaft station of the Panyidong Coal Mine. After repairing, the crosscut floor heave was monitored for 70 d. The results showed the following. (1) After repairing, the maximum cumulative floor heave was 45.3 mm, which was only 8.1% of that before repairing. (2) Crosscut floor heave changed greatly within one week after repair, with a maximum floor heave speed of 4.7 mm/d. The floor heave speed was maintained below 1 mm/d after 40 d, and the floor heave tended to be stable after 60 d. The collaborative control technology enhancing the bearing structure of all-sided surrounding rocks could control the crosscut floor heave in soft rocks under deep high horizontal stress.

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Section: Introductionmentioning

confidence: 99%

Collaborative Control Technology of Crosscut Floor Heave in Soft Rocks under Deep High Horizontal Stress

Liu

Zhai

et al. 2022

Mathematical Problems in Engineering

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“…Currently, in an attempt to establish a theoretical model of grouting, researchers have developed the spherical diffusion theory, cylindrical diffusion theory, carol theory, Baker formula, and G. Lombardi formula, among others Xiao et al 2019;Chen et al 2014;Zhu et al2019;Zheng and Zhang 2015). A large number of engineering studies have reported that the splitting grouting process is very complicated and is the result of uid-solid coupling between the seepage eld and stress eld (Zhang and Shimada 2018;Ra and Stille 2014;Wang 2019;Zhang et al 2017;Liu and Sun 2019;Sha 2019). The diffusion form of grout in coal seam cracks is di cult to obtain through laboratory tests or eld measurements.…”

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

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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.

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“…In Guo et al study [13], in order to propose highly efficient and economical methods of controlling floor heave, numerical simulation, laboratory physical simulation, and engineering practice were carried out to reveal the mechanism of reinforcing roof and sidewalls to control the floor heave of the mining roadway, and engineering practice showed that the floor heave in the roadway, the roof, and the sidewalls, which was reinforced by intensive bolts combined with steel belt, wire mesh, and cable, was significantly reduced compared with that with lower supporting intensity of roof and sidewalls. In Zhang et al study [14], the dynamic distribution of the stress in the RGSG floor was examined to reveal the mechanism of floor heave. Finally, grouting reinforcement was proposed to control the RGSG floor, and the corresponding effectiveness was verified by improving the rock mechanics of the floor strata based on the results of numerical uniaxial compressive tests.…”

Section: Introductionmentioning

confidence: 99%

The Coupled Control of Floor Heave Based on a Composite Structure Consisting of Bolts and Concrete Antiarches

Zheng

Zhao

2018

Mathematical Problems in Engineering

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A composite structure, including concrete antiarches and bolts, was designed to control the floor heave. This semiclosed structure may reinforce the floor and the two bottom corners of the roadway. Then, based on some relative assumptions, we established a model for this structure. We further analyzed this model and revealed the floor heave mechanism. In addition, based on the above analysis, we proposed the stability criterion for this structure. Moreover, with the practical conditions, we proposed a support system for the #1 roadway in S6 mining area of Changcun mine. Furthermore, the stability analysis and the numerical simulation verified the correctness of the design parameters. Simultaneously, the field investigation shows that the floor heave has been reduced by 78.7%, a close value to the mechanical analysis.

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Numerical Study on the Effectiveness of Grouting Reinforcement on the Large Heaving Floor of the Deep Retained Goaf-Side Gateroad: A Case Study in China

Cited by 25 publications

References 23 publications

Collaborative Control Technology of Crosscut Floor Heave in Soft Rocks under Deep High Horizontal Stress

Collaborative Control Technology of Crosscut Floor Heave in Soft Rocks under Deep High Horizontal Stress

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

The Coupled Control of Floor Heave Based on a Composite Structure Consisting of Bolts and Concrete Antiarches

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