Assessment of excavation damage and spalling potential at a mechanized longwall face: a numerical modeling study

Behera, B.; Yadav, Akhilesh Kumar; Singh, Gurmohan; Sharma, Sanjay K.

doi:10.1007/s40948-021-00299-6

Cited by 7 publications

(3 citation statements)

References 80 publications

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“…After many simulation trials, these values were chosen intuitively. Several researchers have adopted a similar approach for roof caving in longwall panels [3,25,[32][33][34][35][36][37]. When a zone qualifies to be caved, it nulled (Figure 8).…”

Section: Constitutive Models For Simulating the Behaviour Rockmentioning

confidence: 99%

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Study on the Mechanism, Prediction, and Control of Coal Wall Spalling in Deep Longwall Panels Utilizing Advanced Numerical Simulation Methodology

Murmu

Budi

2022

Geofluids

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This research looked at the occurrence of coal wall spalling, a type of longwall face failure, during the main weighing period (MWP) for panels greater than 300 m depth. FLAC3D software was exploited to simulate the ground condition of longwall panel 1 of Adriyala Longwall Project mine. The extent and severity of coal wall spalling were quantified using evaluation criteria based on the concepts of vertical stress distribution and maximum shear strain. Subsequently, a parametric analysis of thirteen factors influencing the coal wall spalling was carried out. Empirical equations for predicting coal wall spalling were suggested. Based on the parametric analysis, a coal wall spalling classification system (CWSC) chart is presented to predict spalling characteristics of coal wall that may occur at the MWP. The empirical models depicted good predictive ability with R 2 values greater than 0.9. Parametric analysis revealed that coal wall spalling is highly sensitive to seam compressive strength, mining-induced stress, extraction height, and immediate roof characteristics. The CWSC system’s applicability to the five panels was in good agreement with field observations.

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Section: Constitutive Models For Simulating the Behaviour Rockmentioning

confidence: 99%

“…Yao et al investigated the effect of seam dip and the resulting fracture evolution on the coal wall [24]. Spalling under a massive sandstone key roof was also investigated [3,25]. The role of fracture characteristics such as its dip angle, density, strength, and stiffness on coal wall spalling was studied [26].…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanism, Prediction, and Control of Coal Wall Spalling in Deep Longwall Panels Utilizing Advanced Numerical Simulation Methodology

Murmu

Budi

2022

Geofluids

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“…Some scholars found the decrease in the lumpiness of broken rocks in the key strata of overburden with the increase in working face length, accompanied by weighting of the main key strata, through similar material simulation and field measurement (Zuo et al, 2021;Gao et al, 2022;Liu et al, 2022). A high-intensity working face (characterized by the large mining height, long working face, and fast advance speed) was simplified into a two-dimensional (2D) beam model (He et al, 2020;Behera et al, 2021;Lou et al, 2021). The research found that the height-length ratio of broken rocks in the main roof increases due to the growing thickness of the load-bearing layer, mining height, and working face length.…”

Section: Introductionmentioning

confidence: 99%

Three-peak evolution characteristics of supporting stress on a super-long working face in a thick coal seam

Wang,

Cheng,

Zhang

et al. 2023

Front. Energy Res.

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Increasing working face length is the development trend of intelligent and efficient longwall fully mechanized mining. By combining field measurement and theoretical calculation, change characteristics of the frequency, peak value, and range of weighting in a long working face in a 1000 m-deep shaft of Kouzidong Coal Mine (Fuyang City, Anhui Province, China) were studied. Based on the mechanical model of the hydraulic support group of the elastic independent support, force characteristics and posture change characteristics of the support in the 121304 working face of the mine were studied and analyzed. The supporting stress characteristics of the deep super-long working face were revealed, and the theoretical calculation was in good agreement with the actual measurement. Based on the aforementioned model, support parameters and control technology of the 140502 working face were studied. The results show that as the length of the working face increases, the supporting stress gradually transforms from a single peak to multiple peaks and expands to both ends of the working face. The weighting in different areas of the working face is characterized by an obvious time sequence and great difference in intensity. When the working face length is 300 m, the multi-peak characteristic of super-long working faces appears. The M-shaped three-peak characteristic can be used as the criterion for super-long working faces. A reasonable working face length should be determined by comprehensively considering occurrence conditions of coal seams, working face parameter, and equipment ability. According to the different attributes of hydraulic supports in space and function and combining with zonal characteristics of the long working face, the criterion for the super-long working face and the principle of zonal cooperative control of hydraulic support groups were revealed. In addition, a cooperative control method of equipment groups in the working face based on the state error and cost functions was put forward, and the three-level cooperative control strategy and implementation method were formulated. It can effectively guide the equipment group in the super-long fully mechanized working face in deep thick coal seams to achieve optimal coordinated control.

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浅埋薄基岩超长工作面液压支架群组的承载特性及安全管控研究

Meng

Zhang

et al. 2023

J. Cent. South Univ.

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Assessment of excavation damage and spalling potential at a mechanized longwall face: a numerical modeling study

Cited by 7 publications

References 80 publications

Study on the Mechanism, Prediction, and Control of Coal Wall Spalling in Deep Longwall Panels Utilizing Advanced Numerical Simulation Methodology

Study on the Mechanism, Prediction, and Control of Coal Wall Spalling in Deep Longwall Panels Utilizing Advanced Numerical Simulation Methodology

Three-peak evolution characteristics of supporting stress on a super-long working face in a thick coal seam

浅埋薄基岩超长工作面液压支架群组的承载特性及安全管控研究

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