Stress Distribution and Failure Characteristics for Workface Floor of a Tilted Coal Seam

Sun, Jian; Wang, Lianguo; Zhao, Guiping

doi:10.1007/s12205-019-0786-7

Cited by 25 publications

(10 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The stress at a point M (x, z) in the semi-infinite elastic plane should be the sum of the additional stress on the floor in the three regions and the original rock stress. Its stress expression is Equations (1)- (3). where σ z , σ x , and τ xz represent the vertical, horizontal, and shear stresses of the gob floor, respectively; γ is the volume weight of the rock mass; H represents the depth of the coal seam, and K is the maximum stress concentration factor.…”

Section: Calculation Of Stress In Gob Floormentioning

confidence: 99%

“…Many researchers devoted to studying the deformation and failure of coal seams overlying rock during mining. However, for close‐distance coal seams mining, the problem of floor damage caused by mining coal seams is serious 3–5 . This is because in the close‐distance coal seams mining, the downward mining method is commonly used, and the floor damage caused by upper coal seam mining endangers the mining of lower coal seam.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on distortion energy and stability of gob floor based on stress deviator field

Shan

Wang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

To analyze the plastic failure process and mechanism of gob floor in the process of close-distance coal seams mining, a simplified mechanical model of the lateral abutment pressure of the gob was proposed to derive the stress of surrounding rock. The distribution characteristics of gob floor stress deviator were obtained, and the effect of geological parameters (coal depth H and horizontal lateral pressure coefficient λ) were studied. By combining Mohr-Coulomb theory, the influence of surrounding rock cohesion c, internal friction angle φ, different coal seam depths H and different horizontal lateral pressure coefficients λ on the distribution of plastic zone of gob floor was obtained. The results showed that the distribution of the plastic zone under different geological factors is roughly the same as that of the stress deviator. This also proves that the excavation of the rock layer causes the redistribution of stress, which leads to the plastic failure of the surrounding rock. To verify the rationality of the proposed model, industrial experiments and simulation experiments were carried out. The results of on-site investigation showed that the stability and integrity of surrounding rock in the concentration area of stress deviator is far less than that in the low concentration area. In addition, the acoustic wave test and the displacement field monitoring result of surrounding rock in the simulation experiments of a similar model are basically consistent with the distribution of the stress deviator field. These results agree well with the distribution of stress deviator obtained by theoretical calculation.

show abstract

Section: Calculation Of Stress In Gob Floormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on distortion energy and stability of gob floor based on stress deviator field

Shan

Wang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…Under the overburden stress, the hinge area of the rock block is bearing compressive force and is likely to experience plastic failure, thus accelerating the rotatory instability of the hinged structure (Wang et al 2019;Sun et al 2019). The rotatory instability model of fractured rock block is shown in Fig.…”

Section: Rotatory Instability Model Of the Main Roofmentioning

confidence: 99%

Dip Angle Effect on the Main Roof First Fracture and Instability in a Fully-mechanized Workface of Steeply Dipping Coal Seams

Wei

Yang

Liu

et al. 2020

Preprint

View full text Add to dashboard Cite

The study of fracture and instability mechanism of the main roof in steeply dipping coal seams (SDCS) workface is crucial to the proper choice of support type and control of stability of surrounding rock, as well as the safe and effective mining in the coal seam. Based on the established SDCS main roof model, this study derived the stress distribution in the main roof under linear load, analyzed the dip angle effect associated with the evolving stress of SDCS workface, and elaborated the sequential characteristics of the ground pressure mechanism. Besides, an inclined unstable structure model of the main roof based on deformation, fracturing, and rotating of the main roof in the SDCS workface was also proposed here, which explained the impacts of overburden rock's key parameters on sliding and rotatory instability of rock mass. In light of the analysis of the movement rule of overburden rock and loading condition of support, it is found that, when the roof and floor in the workface are stable, the critical support resistance with the absence of sliding and rotating increases as the dip angle of coal seam increases, the roof is in the state of discontinuous movement due to its self-weight and overburden pressure. Support is affected by the discontinuous movement and moved along with the roof. The results of this study can be of theoretical reference to the control of SDCS.

show abstract

“…Many researchers analyzed the relationship between floor failure depth and mining height [29][30][31]. Previous studies have established the evaluation formula of paste-filling floor and the relationship between safety factor and filling parameters [32,33]. However, the effects of filling step, advancing distance, and floor failure on floor stability have not been studied thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Water Inrush Prevention Mechanism of Paste-Filled Floor above Confined Water

et al. 2022

View full text Add to dashboard Cite

To study the influence of filling step and advancing distance on the deformation and failure of a working face floor, a mechanical model based on elastic foundation beam theory is established. The deflection and bending moment curves of the floor under different filling steps and advancing distance are obtained by Maple. Then, a fluid–solid coupling model of paste-filling mining on confined water is established by FLAC3D. The effects of different filling steps and advancing distance on the floor displacement, stress, and plastic zone of the floor are analyzed. The results show that there is a “concave” quadratic relationship between the filling step and the maximum displacement of the floor, and there is a “convex” quadratic relationship between the advancing distance and the maximum displacement of the floor. The maximum stress of the floor increases linearly with the increase in filling distance and tends to be stable with the increase in advancing distance. Moreover, the increase in filling steps will lead to the continuous increase in longitudinal failure. This study could guide paste-filling mining above confined water.

show abstract

Stress Distribution and Failure Characteristics for Workface Floor of a Tilted Coal Seam

Cited by 25 publications

References 20 publications

Study on distortion energy and stability of gob floor based on stress deviator field

Study on distortion energy and stability of gob floor based on stress deviator field

Dip Angle Effect on the Main Roof First Fracture and Instability in a Fully-mechanized Workface of Steeply Dipping Coal Seams

Analysis on Water Inrush Prevention Mechanism of Paste-Filled Floor above Confined Water

Contact Info

Product

Resources

About