Modeling Rock Fracture Propagation and Water Inrush Mechanisms in Underground Coal Mine

Zhang, Shichuan; Shen, Baotang; Li, Yangyang; Zhou, Shen

doi:10.1155/2019/1796965

Cited by 45 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, the rock has three failure types under the unconfined or uniaxial compression loading, including X-conjugate oblique shear failure, single slope shear failure, and splitting failure [35]. CGFACPB material was a lowgrade concrete material, which was also called similar rock material.…”

Section: Compression Test Resultsmentioning

confidence: 99%

Experimental Investigation on Mechanical Properties of In Situ Cemented Paste Backfill Containing Coal Gangue and Fly Ash

Zhuang

Zhang

2020

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

Cemented paste backfill containing coal gangue and fly ash (CGFACPB) is an emerging backfill technique for coal mines that allows environmentally hazardous coal gangue and fly ash to be reused in the underground goaf. Meanwhile, CGFACPB can provide an efficient ground support and reduce the surface subsidence. Due to the difference of consolidation environment between the laboratory and the field, the mechanical properties of the cemented paste backfill vary significantly. In this paper, the core specimens were collected from an underground coal mine where the CGFACPB was used for coal mining, and the mechanical properties of the collected specimens were investigated. The cores were obtained from the underground coal mine, and then the standard cylinders or discs were prepared in laboratory. The uniaxial compressive strength (UCS), Young’s modulus, and Poisson’s ratio were determined by the compression tests, and the tensile strength was achieved by the Brazilian test. Then the internal friction angle and cohesion were calculated using the improved Mohr–Coulomb strength criterion. The results showed the development of UCS can be divided into four stages, and the final long-term stable value was about 5.1 MPa. The development of Young’s modulus had similar trend. Young’s modulus had a range from 550 MPa to 750 MPa and the mean value of 675 MPa. Poisson’s ratio gradually increased with the underground curing duration and eventually approached the stable value of 0.18. The failure type of compression samples was mainly single-sided shear failure. The development of tensile strength can be divided into two stages, and the stable value of the tensile strength was about 1.05 MPa. The development of cohesion can be divided into four stages, and the stable value was about 1.75 MPa. The stable value of the internal friction angle was about 25°. This study can provide significant references for not only the long-term stability evaluation of CGFACPB in the field but also the design of optimal recipe of the cemented paste backfill (CPB).

show abstract

Section: Compression Test Resultsmentioning

confidence: 99%

Experimental Investigation on Mechanical Properties of In Situ Cemented Paste Backfill Containing Coal Gangue and Fly Ash

Zhuang

Zhang

2020

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…5 − 7 However, the formation of the water inrush channel was not due to the plastic deformation of rock mass but rather due to the expansion of mining-induced fractures. 8 Through physical simulation, Zhang 9 studied the formation process of cracks and the evolution of high-pressure water inrush channel under the floor and considered that the connection between the structural rock zone and cracks in the coal floor was the direct cause of water inrush from the coal floor. Zhou 10 used the extended finite element method and fracture mechanics to carry out numerical simulation, quantitatively analyzed the stress field at the tip of the fault, and evaluated the possibility of water inrush from fault activation.…”

Section: Introductionmentioning

confidence: 99%

Rock Damage Model Coupled Stress–Seepage and Its Application in Water Inrush from Faults in Coal Mines

Shao¹,

Zhang²,

Wu³

et al. 2022

ACS Omega

View full text Add to dashboard Cite

Mining-induced fractures often constitute water inrush channels, which lead to mine water inrush accidents. In this paper, a coupled model of stress–seepage–damage based on micromechanics is established, which simulates the initiation and propagation of cracks in rock materials and their interaction with fluid flow. The method combines the continuous damage model with the effective stress principle, in which the elastic modulus and permeability are related to the damage variables. The model is implemented via the COMSOL code based on the finite element method, and the reliability of the model is verified by the axial compression–seepage test of standard rock samples. According to the actual geological conditions of F13 fault in Wugou Coal Mine, Anhui Province, the damage of the floor rock mass and the risk of fault water inrush in the 1033 mining face with 50, 40, 30, and 20 m waterproof coal pillars are predicted. When the coal pillar width is 30 or 20 m, the fault, the surrounding rock of the fault, and the failure zone of the floor constitute the water inrush channel. This model provides an intuitive understanding of the rock damage and water inrush evolution, which is difficult to observe, and will contribute to prevent water inrush disasters in practical engineering.

show abstract

“…In addition, water inrush disasters also lead to environmental damage, such as surface collapse and groundwater contamination [16,17]. For a long time, the water inrush from hidden fault has been one of the important topics in rock and hydraulic mechanics studies [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Crack Propagation on Mining-Induced Delayer Water Inrush Hazard of Hidden Fault

Liu

Meng

et al. 2021

Geofluids

View full text Add to dashboard Cite

Hidden faults in deep coal seam floor threaten the exploitation of coal resources. Under the influence of mining and water confined in the floor, the cemented filler in the hidden fault will be eroded by water flow, in order to investigate the fracture characteristics and water inrush risk of hidden faults in floors above confined aquifer. Using the 27305 working face as geological background, the influence of the seepage scouring filler on the mechanism of water inrush from hidden faults was assessed by developing a stress-seepage coupling model and employing the finite difference method to simulate the seepage process of hidden faults under the combined action of high ground stress and high confined water. The evolution of seepage, shear stress, and plastic zone was also assessed. The influence of the hydraulic pressure of the aquifer and the thickness of a waterproof rock floor on the formation of the water inrush pathway was analyzed. Results indicate that (1) under the influence of mining, the hidden fault experienced the change process of stress stability, stress concentration, and stress release. The shear stress increases first and then decreases. The compressive stress decreases gradually due to stress release. (2) Water inrush disaster will not occur immediately when the working face is above the hidden fault. The delayed water inrush occurs in the mined-out area when the working face advances to 160 m, the floor failure zone is connected with the hidden fault failure zone, and the delayed water inrush channel is formed. (3) With the mining advances, the water pressure of aquifer is the same. The larger-angle fault leads to the thinner thickness of floor aquifer. The greater the influence of hidden fault on coal seam mining, the higher the danger of water inrush.

show abstract

Modeling Rock Fracture Propagation and Water Inrush Mechanisms in Underground Coal Mine

Cited by 45 publications

References 25 publications

Experimental Investigation on Mechanical Properties of In Situ Cemented Paste Backfill Containing Coal Gangue and Fly Ash

Experimental Investigation on Mechanical Properties of In Situ Cemented Paste Backfill Containing Coal Gangue and Fly Ash

Rock Damage Model Coupled Stress–Seepage and Its Application in Water Inrush from Faults in Coal Mines

Effect of Crack Propagation on Mining-Induced Delayer Water Inrush Hazard of Hidden Fault

Contact Info

Product

Resources

About