Physical test of fracture development in the overburden strata above the goaf and diffusion process of permeable grout slurry

Shi, Hong; Zhang, Yongbo; Tang, Li

doi:10.1007/s10064-021-02189-3

Cited by 21 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Extensive research has been conducted on the impact of groundwater on goaves, and various research results have been published [9][10][11][12][13][14][15][16]. Researchers have performed comprehensive experiments on rock compaction under various conditions and have studied rock seepage in different circumstances.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Groundwater Damage to Overlying Rock in Goaf

Zhu,

Liu,

Sun

2024

Processes

View full text Add to dashboard Cite

The discontinuation of pumping and drainage activities upon the cessation of mining operations leads to the gradual accumulation of groundwater. This inflow into mined-out areas affects the properties of the rock, disturbing the previously stable goaf and exacerbating instability. In this study, we advance an existing theoretical framework pertaining to the residual deformation of mines by delineating the mechanisms through which groundwater influences the degradation of the overlying strata in goaf areas. Using analogous material simulation experiments and rigorous theoretical analyses, we clarify the specific mechanisms by which groundwater causes structural damage to these regions. The deformation of overlying rock is divided into three different forms: the compressive deformation of rock, the sliding instability of rock, and the rotational instability of rock. The main contributions of this study are its refinement of the existing theory of the residual deformation of mines, an analysis of the damage mechanisms of groundwater, and suggestions regarding technical support for targeted treatment measures in affected mines.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanisms of Groundwater Damage to Overlying Rock in Goaf

Zhu,

Liu,

Sun

2024

Processes

View full text Add to dashboard Cite

show abstract

“…Gao et al (2014) proposed a combined numerical method to investigate the failure mechanism of roads above unstable goafs, which are consistent with the actual case. With the progress in science and technology and the gradual completion of modern engineering construction technology, a relatively mature management system has been realized to address challenges in mined-out area backfilling, thus significantly contributing towards the long-term and effective development in mines (Zhu et al, 2017;Shi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Stability analysis and numerical simulation of foundation in old goaf under building load

Zhang

Li²,

Li³

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

This study comprehensively analyzes the safety and stability of old goaf under construction engineering based on specific projects using a variety of research methods. The Beijing Mentougou mining area is used as the research background. The methods of field investigation, laboratory testing, engineering drilling, geophysical exploration, theoretical calculation, and numerical simulation are combined to quantitatively analyze the stability of the foundation and ground buildings in old goaf. The influence depth of the building load and height of the caving crack zone are calculated using the “three-zone theory” to judge if the goaf is at risk of activation. Further simulation is conducted using two types of finite element analysis software, which increases the reliability of the numerical analysis. The results demonstrate that uneven subsidence of approximately 100 mm occurs in the buildings and ground surface, and subsidence of approximately 50 mm occurs in the goaf roof. It is also proven that goaf affects the stability of the surrounding rock and building foundation. Finally, a goaf treatment scheme is proposed. The treatment effect is found to be remarkable through field tests and numerical simulations, ensuring the safety and stability of a building foundation. The combination of theoretical calculation and numerical simulation can effectively evaluate the safety and stability of the project under load, and has a strong promotion and application value. The research results meet the needs of engineering practice, and provide a great reference value for the rational utilization of the land above the old goaf in the Mentougou district of Beijing and similar mining cities, which has a good theoretical significance and application prospect.

show abstract

“…Zhu et al 29 used the self-designed visual test platform for slurry diffusion in goaf to monitor the flow diffusion range of coal gangue slurry in the caving zone of goaf by using the active heating fiber method (AHFO). Shi et al 30 , 31 studied the diffusion behavior of grouting slurry under different conditions through an experimental system simulating the development of cracks in overlying strata in the goaf. By establishing numerical models, Wang et al 32 studied the diffusion and rock displacement laws of fluidized gangue with different grouting speeds, pore ratios, and gangue particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Simulation test study on filling flow law of gangue slurry in goaf

Shi,

Zhao,

Liang

et al. 2023

Sci Rep

View full text Add to dashboard Cite

The disposal and utilization of solid waste of coal gangue is one of the main problems in coal mining in China. Injecting coal gangue into goaf in the form of slurry can effectively solve the problems of ground stacking and environmental pollution prevention. In order to obtain the flow law of gangue slurry in the void of the accumulated rock in the goaf, a visualization simulation test device for gangue slurry permeation grouting in the goaf was independently designed. The flow and diffusion characteristics, flow and diffusion velocity changes, void pressure changes, and viscosity changes of three mass concentrations (76%, 78%, 80%) of gangue slurry in the void between caved rock blocks in goaf were studied by visual grouting simulation test. The results show that: (1) The seepage process of gangue slurry in the goaf simulation test is divided into three diffusion forms, namely radial diffusion, axial diffusion, and bidirectional diffusion. The three diffusion forms are interrelated and inseparable. (2) The initial flow velocity of the slurry with different concentrations is different under the same permeation grouting pressure, and the higher the slurry concentration, the smaller the initial flow velocity of the slurry. The velocity of the slurry has a nonlinear relationship with the diffusion distance of the slurry. (3) With the permeation and diffusion of slurry, pressure sensors at different positions are subjected to pressure from bottom to top and enter the pressure boost stage, gradually forming stress peaks. When the slurry exceeds the position of the pressure sensor, the pressure on the pressure sensor is weakened and begins to enter the pressure relief stage, and the stress decline trend gradually becomes gentle with time. (4) The water loss effect occurs during slurry flow interaction with rock mass, resulting in slurry viscosity increasing. The viscosity of the slurry affects the difference in the amount of viscosity change. The research results can provide a certain theoretical basis for the goaf gangue slurry filling project.

show abstract

Physical test of fracture development in the overburden strata above the goaf and diffusion process of permeable grout slurry

Cited by 21 publications

References 24 publications

Mechanisms of Groundwater Damage to Overlying Rock in Goaf

Mechanisms of Groundwater Damage to Overlying Rock in Goaf

Stability analysis and numerical simulation of foundation in old goaf under building load

Simulation test study on filling flow law of gangue slurry in goaf

Contact Info

Product

Resources

About