Hybrid Finite‐Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

An, Huaming; Liu, Hongyuan; Han, Haoyu

doi:10.1155/2020/7153958

Cited by 10 publications

(13 citation statements)

References 34 publications

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“…The discrete unit method is widely used in our industry [19][20][21][22][23], agriculture [24][25][26], and construction [27] as a reliable test method and tool [28]. In 1971, CUNDALL proposed a numerical simulation method to solve discontinuous media problems, the discrete element method (DEM), based on the theory of combining different instantons [29].…”

Section: Hertz-mindlin With Bonding V2 Contact Modelmentioning

confidence: 99%

Calibration and Modeling of Parameters for Kale Root Stubble Simulation Based on the Discrete Unit Method

Chen,

Jiang,

Liu

et al. 2023

Agronomy

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Today, the post-harvest root stubble treatment of kale in Hunan mostly uses manual pulling and centralized treatments, which are inefficient and labor-intensive. In this study, to realize the direct mechanical crushing of kale root stubble and return it to the field after harvesting, we established an accurate simulation model of kale root stubble by creating a model of the root stubble of kale and calibrating the parameters of the simulation. This study took Jingfeng No. 1 kale stubble as the research object and used EDEM2021.2 simulation software to study the parameters of the kale stubble-crushing simulation model. The peak shear force of the sheared kale root stubble was used as the test data, and the most significant factors affecting the shear force were screened out through the Plackett–Burman test for the Design-Expert design. In addition, the steepest climb test and Box–Behnken test were used to accurately assess the factor data to obtain the best simulation value, which was 861.02 N. The relative error between the simulated and measured values was 0.61%. Finally, an accurate simulation stubble model was established by combining the best simulation parameters with the measured stubble length and diameter. This model provides a theoretical basis and technical support for more in-depth research on stubble simulation and mechanized stubble return.

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Section: Hertz-mindlin With Bonding V2 Contact Modelmentioning

confidence: 99%

Calibration and Modeling of Parameters for Kale Root Stubble Simulation Based on the Discrete Unit Method

Chen,

Jiang,

Liu

et al. 2023

Agronomy

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“…Element Method e FDEM has been calibrated by the uniaxial compressive strength and Brazilian tensile strength test under quasistatic and dynamic loading conditions in our previous research [40][41][42][43]. us, in this section, instead of modelling of the conventional compressive and tensile strength test used in laboratory, the FDEM is calibrated through modelling the crater formation process by blast.…”

Section: Calibration Of the Combined Finite-discretementioning

confidence: 99%

Combined Finite‐Discrete Element Modelling of Dynamic Rock Fracture and Fragmentation during Mining Production Process by Blast

Song

Liu

et al. 2021

Shock and Vibration

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A combined finite-discrete element method (FDEM) is proposed to model the dynamic fracture, fragmentation, and resultant muck-piling process during mining production by blast in underground mine. The key component of the proposed method, that is, transition from continuum to discontinuum through fracture and fragmentation, is introduced in detail, which makes the proposed method superior to the continuum-based finite element method and discontinuum-based discrete element method. The FDEM is calibrated by modelling the crater formation process by blast. The FDEM has well modelled the stress and fracture propagation and resultant fragmentation process. In addition, the proposed method has well captured the crushed zone, cracked zone, and the radial long crack zone. After that, the FDEM is employed to model the dynamic fracture and resultant fragmentation process by blast during sublevel caving process in an underground mine. Then the FDEM has well modelled the stress propagation process, as well as the fracture initiation and fragmenting process. Finally, the effects of borehole spacing and initial gas pressure are discussed. It is concluded that the FDEM is a value numerical approach to study the dynamic rock fracture process by blast.

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“…Hence, the alternative approach that is able to represent reality is using physical models at a 1:1 scale or computational modeling. The latter has historically achieved reliable results in highway engineering, such as bridges, tunnels, and pavements [28][29][30]. Furthermore, when the correct method was chosen, it was applied successfully to find the calibration constants necessary to study a real structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Relative Humidity and Temperature on the Drying Shrinkage of Roller-Compacted Concrete Pavements

Pulecio-Díaz,

Sol-Sánchez,

Moreno-Navarro

2024

Infrastructures

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Roller-compacted concrete (RCC) pavements have been the subject of studies focused on their increasing deterioration over time due to the influence of vehicular loading and ambient factors in humidity and temperature conditions ranging from medium to low (40% relative humidity and 25 °C temperature). Therefore, it is necessary to understand how they behave under various relative humidity and temperature conditions since these parameters vary in each geographic region. In this context, this research focused on analyzing the effect of drying shrinkage on RCC pavements under the influence of vehicular loading using a computational model calibrated with data obtained under typical ambient conditions. For this purpose, laboratory experiments were performed, numerical modeling was used, and the results for RCC pavements were validated using statistical analysis. The results revealed validated models providing moisture content and drying shrinkage curves. These results also underline the importance of considering ambient effects when calculating pavement stresses as a response variable in structural designs. In particular, these effects are highlighted as they can generate changes in pavement stresses of up to 10%, emphasizing the relevance of the models proposed in this study as they consider this phenomenon when predicting the performance and durability of RCC pavements.

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Hybrid Finite‐Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

Cited by 10 publications

References 34 publications

Calibration and Modeling of Parameters for Kale Root Stubble Simulation Based on the Discrete Unit Method

Calibration and Modeling of Parameters for Kale Root Stubble Simulation Based on the Discrete Unit Method

Combined Finite‐Discrete Element Modelling of Dynamic Rock Fracture and Fragmentation during Mining Production Process by Blast

Effects of Relative Humidity and Temperature on the Drying Shrinkage of Roller-Compacted Concrete Pavements

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