3D DEM method for compaction and breakage characteristics simulation of broken rock mass in goaf

Zhang, Cun; Zhao, Yixin; Bai, Qingsheng

doi:10.1007/s11440-021-01379-3

Cited by 41 publications

(23 citation statements)

References 60 publications

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“…In performing calculations using the above equation, scholars have demonstrated that the KC constant is not a true constant, but is only a constant with respect to porosity, and the results of this study similarly confirm this. The cubic theorem [ 42 ] is satisfied between permeability and porosity through analysis of the fitted parameters, as given by:

where

represents the reference porosity, generally taken as the initial porosity; K 0 is the permeability when the porosity is

. The mixed flow of water–gas within the peripore-fractured coal body is shown in Figure 16 .…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation of the Effect of Groundwater on the Relative Permeability of Coal Bodies around Gas Extraction Boreholes

Pang

Pan

Zhang

et al. 2022

IJERPH

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Water infiltration in boreholes is a common problem in mine gas pre-extraction, where water infiltration can significantly reduce the efficiency of gas extraction and curtail the life cycle of the borehole. It is important to evaluate the effect of groundwater on the permeability of the coal body around a gas extraction borehole. In order to determine the seepage parameters of the fractured coal body system around the borehole, a water–gas two-phase seepage test was designed to determine the relative seepage parameters of the fractured coal media seepage system. The main conclusion is that the relative permeability of gas can be effectively increased by increasing the negative extraction pressure at the early stage of extraction to accelerate drainage to reduce the water saturation of the coal seam. Under the combined effect of porosity and seepage pressure, the relative permeability of gas and water in the fractured coal rock body shows three stages. The dependence of the total permeability on the effective stress is closely related to the stages in the evolution of the pore structure, and the total effective permeability decreases with the increase in the effective stress. A decrease in porosity can lead to a decrease in permeability and an increase in the non-Darcy factor. Through an in-depth analysis of the damage and permeability pattern of the coal body around the perimeter of the dipping borehole, the efficient and safe extraction of gas from dipping boreholes in water-rich mines is thus ensured.

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where

represents the reference porosity, generally taken as the initial porosity; K 0 is the permeability when the porosity is

. The mixed flow of water–gas within the peripore-fractured coal body is shown in Figure 16 .…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation of the Effect of Groundwater on the Relative Permeability of Coal Bodies around Gas Extraction Boreholes

Pang

Pan

Zhang

et al. 2022

IJERPH

View full text Add to dashboard Cite

show abstract

“…However, these simulation methods did not consider the influence of roof rock damage. Zhu et al and Zhang et al [15,22] proposed 3D simulation methods for broken rock masses in goaves, but they mainly focused on the laboratory scale.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Stability Control Technology of Large-Area Wall Caving Area (LAWCA) in Large-Inclined Face

Liu

et al. 2023

Geofluids

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The caving characteristics of the goaf significantly impact the mining stability of the working face. The coal-forming environment of the steeply dipping coal seam is complex. After mining, the caving rock mass rolls to the lower part of the working face due to gravity, and the caving compaction characteristics of the working face are different from those of the flat and gently inclined working face, taking Huainan Xinji No. 2 Mine 211112 high-angle composite roof working face large-area gang roof fall area as the engineering background. To safely pass through a large roof fall area, a FLAC3D numerical simulation method considering the goaf’s compaction effect and the excavation’s additional damage is proposed. The Weibull distribution function is introduced to modify the elastic modulus parameters of the rock mass after excavation, which more accurately reflects the damage process of the rock mass after hole. Based on the goaf compaction theory, the elastic model is developed for the second time, and the accurate simulation of the caving rock mass is realized. On this basis, the proposed numerical simulation method is used to simulate the large-area roof caving of the large-angle working face, a scheme to control the stability of the working face by using the paste filling technology is proposed, and the material parameters of the filling body are determined. The research results show that when the water-cement ratio of the backfill is 3 : 1, the simulation and field trial results are good, and the safe and efficient mining of the large-angle composite roof working face is realized, which verifies the feasibility and correctness of the coupled simulation method. At the same time, the research results can provide a reference for controlling the roof fall area of the working face with a large inclination angle.

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“…At the deep seabed with high confining pressure, grain breakage process is an interesting phenomenon, which has attracted much attention 21–24 . Some numerical simulations are carried out to study the grain breakage process and its effects on localized deformation bands formation 25–33 . For example, Ip and Borja proposed a framework for modeling breakage process during compaction band formation by coupling a phase‐field approach with modified Cam‐Clay plasticity and breakage mechanics 30 .…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] Some numerical simulations are carried out to study the grain breakage process and its effects on localized deformation bands formation. [25][26][27][28][29][30][31][32][33] For example, Ip and Borja proposed a framework for modeling breakage process during compaction band formation by coupling a phase-field approach with modified Cam-Clay plasticity and breakage mechanics. 30 Wang et al developed conjugated bond-pair-based peridynamic 31,32 and phase-field model 33 for simulating fracture process and compaction bands formation, respectively.…”

Section: Introductionmentioning

confidence: 99%

A hypoplastic model for hydrate‐bearing sand considering hydrate saturation and grain breakage

Qian,

Wu,

et al. 2023

Num Anal Meth Geomechanics

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We present a hypoplastic model to capture the mechanical responses of hydrate‐bearing sands by incorporating hydrate saturation and grain breakage. In our model, a new degradation scalar is introduced to account for the effects of hydrate bonding evolution on strength. We also adopt the variable critical state line to assess the effects of hydrate saturation and relative breakage ratio at high confining pressure. This model is validated by modeling a series of laboratory tests.

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3D DEM method for compaction and breakage characteristics simulation of broken rock mass in goaf

Cited by 41 publications

References 60 publications

Experimental Investigation of the Effect of Groundwater on the Relative Permeability of Coal Bodies around Gas Extraction Boreholes

Experimental Investigation of the Effect of Groundwater on the Relative Permeability of Coal Bodies around Gas Extraction Boreholes

Numerical Simulation Study on Stability Control Technology of Large-Area Wall Caving Area (LAWCA) in Large-Inclined Face

A hypoplastic model for hydrate‐bearing sand considering hydrate saturation and grain breakage

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