DEM analysis on the role of aggregates on concrete strength

Wang, Pei; Gao, Ning; Ji, Koochul; Stewart, Lauren K.; Arson, Chloé

doi:10.1016/j.compgeo.2019.103290

Cited by 62 publications

(25 citation statements)

References 56 publications

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“…During the whole loading process, tensile cracks are the dominated cracks all the time, and is approximately five times that of the shear cracks at peak strength, which indicates that the rock fails in a tensile pattern. The numerical simulated results are in accordance with the phenomenon observed in the other research work 59,73 …”

Section: Results and Analysissupporting

confidence: 90%

“…Li and Ma 55 developed a novel 3D‐GBM based on the 3D Voronoi tessellation technology and implemented it into PFC 3D to investigate the micro‐mechanical behavior of a salt rock. Wang 58,59 defined a new DEM model that can describe the processes involved in particle breakage and the resulting macroscopic behavior of the particulate assembly in PFC 3d based on XCT observations. However, limited by the modeling method and computer capacity, there are still numerous problems in 3D–GBM models.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of microcracking behaviors in brittle rock using polygonal grain‐based distinct method

Wang

et al. 2021

Num Anal Meth Geomechanics

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The failure process in brittle rocks is an important topic in rock mechanics, whose good understanding assists in predicting the strength and deformation characteristics of rocks. Because it is difficult to directly observe microcracks in laboratory tests, a numerical model is a useful tool for investigating microcracking behaviors. However, the mechanism of microcrack evolution is still unclear at the grain scale considering the microscopic heterogeneities. This paper proposes a polygonal universal distinct element code grain‐based model to solve this problem. Compared with other grain‐based models, this model is different in that mineral grains are subdivided into polygon blocks. The grain size, composition, and bond types of the contacts are incorporated, and both inter‐ and intra‐grain cracks are mimicked. Subsequently, micro‐parameters of the blocks and contacts are carefully calibrated according to the laboratory results. Following this, the calibrated model is employed to study the microcracking behaviors of granite in unconfined compression, confined compression, and Brazilian splitting tests. Both the cumulative numbers and locations of microcracks in different grains are recorded, and the types of macroscopic fractures are identified. The modeling results show that tensile cracks dominate the generated microcracks in the low confined compression tests, and the macroscopic fracture pattern is axial splitting. Shear cracks are dominant in the high confined compression tests, and the macroscopic failure pattern is X‐type shear failure. The simulated results are consistent with those observed in the laboratory tests, and thus, may assist in improving rock acoustic emission monitoring and understanding the damage process of rock.

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Section: Results and Analysissupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Investigation of microcracking behaviors in brittle rock using polygonal grain‐based distinct method

Wang

et al. 2021

Num Anal Meth Geomechanics

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“…The grain and cement moduli and ratios of normal to shear stiffness were set equal to one another to reduce the number of free parameters. The frictional coefficient, which is known to not greatly influence DEM results (Potyondy and Cundall) [26], was set to 0.5 as recommended in the state of the art (Wang et al) [27]. The linear behavior was found to be highly governed by Young's modulus.…”

Section: Dem Model Calibrationmentioning

confidence: 99%

DEM Modeling of Crushable Grain Material under Different Loading Conditions

Benmebarek

Rad

2021

Period. Polytech. Civil Eng.

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This paper deals with the effect of contact conditions on the crushing mechanisms and the strength of granular materials. The computation of crushable grain material under different loading conditions is performed using 3D model of discrete element method (DEM). The crushable macro-grain is generated from a large number of identical spherical micro-grains which are connected according to the bonded particle model. First, the parameters of the proposed DEM model are calibrated to match the force-displacement curve obtained from Brazilian Tests performed on cylinders made of artificially crushable material. The damage profile right at the point when the force-displacement curve reaches its maximum is seen to replicate the same crack patterns observed in Brazilian test experiments. Then, parametric investigations are performed by varying the coordination number, the contact location distribution, and the contact area. The results show that these parameters play a significant role in determining the critical contact force and fracture mechanism of crushable particles compared to a traditional macro-grain crushing test. Increasing distribution and coordination number of the macro-grain increases particle strength when large area contact is permitted. However, for linear contact area, the effect of increasing coordination number on particle strength is marginal.

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“…In order to study the effect of intersection angle on the failure mechanism of utility tunnel, this paper compared the stress redistribution, deformation characteristics, equivalent plastic strain, and failure mechanism of utility tunnel with different intersection angle through numerical analysis. Many scholars have solved engineering problems by using numerical analysis method due to its advantages of high efficiency, high accuracy, and low cost [18][19][20][21]. Because this method is not limited by the experimental funds and size of test model when carrying out so many researches, the study can optimize the design of utility tunnels built in ground fissures area.…”

Section: Ground Fissures Metromentioning

confidence: 99%

The Effect of Intersection Angle on the Failure Mechanism of Utility Tunnel

Wang

et al. 2020

Advances in Civil Engineering

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Planning utility tunnel network in the area with geological disasters poses serious concerns, especial for the utility tunnel built in the ground fissures developed cities. Many prevention and control measures have been taken when the utility tunnel crossed the ground fissures, such as finding the right intersection angle when planning the utility tunnel. In order to study the effect of intersection angle for utility tunnel when crossing ground fissures, this paper compares outcomes when the utility tunnel crosses ground fissures with different intersection angle through numerical simulation method. Because actually the intersection angle of utility tunnel and ground fissures is varied, in order to make stress-strain relationship of the model more realistic, a trilinear mode of reinforcing bar stress-strain relationship was established, and the material property of utility tunnel and soil were assigned to concrete damaged plasticity and Mohr-Coulomb plasticity, respectively. The simulation result shows that the axial tension stress and vertical shear stress of utility tunnel are increased with the increasing of intersection angle, but displacement and shear stress of utility tunnel in horizontal direction are increased with the decreasing of intersection angle. The variation of intersection angle of utility tunnel and ground fissures cannot significantly reduce the damage of utility tunnel. The vertical displacement of utility tunnel does not vary with intersection angle. Finally, this paper suggests that the strengthening length of utility tunnel should not be less than 50 meters (10 times the height of utility tunnel) on both sides of the ground fissures no matter the variation of intersection angle.

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DEM analysis on the role of aggregates on concrete strength

Cited by 62 publications

References 56 publications

Investigation of microcracking behaviors in brittle rock using polygonal grain‐based distinct method

Investigation of microcracking behaviors in brittle rock using polygonal grain‐based distinct method

DEM Modeling of Crushable Grain Material under Different Loading Conditions

The Effect of Intersection Angle on the Failure Mechanism of Utility Tunnel

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