Acquisition of normal contact stiffness and its influence on rock crack propagation for the combined finite-discrete element method (FDEM)

Deng, Penghai; Liu, Quansheng; Huang, Xing; Liu, Qi; Ma, Hao; Li, Weiwei

doi:10.1016/j.engfracmech.2020.107459

Cited by 37 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cohesive element method simulates cracking by inserting cohesive elements between solid elements. Cohesive elements can effectively simulate the entire crack initiation, propagation, and failure process, thereby reflecting the failure process of quasi-brittle materials [26].…”

Section: Cohesive Element Methodsmentioning

confidence: 99%

Mechanical Properties of Rock Specimens Containing Pre-Existing Cracks with Different Dip Angles Based on Energy Theory and Cohesive Element Method

Tian,

Feng,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

To investigate the influence of the crack dip angle on the strength of rock specimens, uniaxial compression tests were conducted on granite specimens containing pre-existing cracks. The strain energy evolution during the loading process was analyzed, and the loading-induced cracking process was simulated using the cohesive element method. Both the experimental and numerical results indicate that cracks significantly impact the plastic-yielding stage of the stress–strain curve more than the initial and elastic deformation stages. When the crack dip angle is less than 45°, the stress concentration near the crack is significant, which is an important factor affecting the strength and elastic strain energy distribution of rock specimens. When the crack dip angle is greater than 45°, the degree of stress concentration decreases, and the uniformity of the elastic strain energy distribution and the possibility of crack bifurcation increase. Combining the energy theory with the cohesive element method helps comprehensively understand the initiation, propagation, and coalescence of microcracks near pre-existing crack tips. These research results can provide a reference for geotechnical engineering design and structural stability assessment.

show abstract

Section: Cohesive Element Methodsmentioning

confidence: 99%

Mechanical Properties of Rock Specimens Containing Pre-Existing Cracks with Different Dip Angles Based on Energy Theory and Cohesive Element Method

Tian,

Feng,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Given the primarily rigid characteristics of pebbles, this study utilised the traditional linear contact stiffness model [37] as the foundational contact model in the DEM for pebble aggregates. This contact model is extensively used in research on rigid particles, including rocks and pebbles [38,39]. The key parameters of the pebble DEM included frictional characteristics and were calibrated through open-top box compression tests [15] (Figure 5).…”

Section: Calibration Of the Parameters For Pebble Discrete Element Mo...mentioning

confidence: 99%

Investigating the Influence of Varied Particle Sizes on the Load-Bearing Properties of Arrester Bed Aggregates

Liu,

Bai

2024

Materials

View full text Add to dashboard Cite

This study employs the discrete element method to investigate the influence of particle size on the load-bearing characteristics of aggregates, with a specific emphasis on the aggregates used in escape ramp arrester beds. This study utilises the log edge detection algorithm to introduce an innovative approach for modelling irregularly shaped pebbles, integrating their physical properties into a comprehensive discrete element model to enhance the accuracy and applicability of simulations involving such pebbles. Meticulous validation and parameter calibration (friction coefficient: 0.37, maximum RMSE: 3.43) confirm the accuracy of the simulations and facilitate an in-depth examination of the mechanical interactions between aggregate particles at macroscopic and microscopic scales. The findings reveal a significant relationship between the particle size and load-bearing capacity of aggregates. Smaller pebbles, which are more flexible under pressure, can be packed more densely, thereby improving the distribution of vertical forces and increasing the concentration of local stress. This enhancement substantially increases the overall load-bearing capacity of aggregates. These discoveries hold significant implications for engineering practices, particularly in the optimisation of safety for truck escape ramps and in identifying the ideal sizes of pebbles with irregular shapes.

show abstract

“…Figure 1 shows a typical rock slope containing various defects, including complex joints, square holes, circular holes, triangular holes, and trapezoidal holes. The existence of these defects greatly reduces the strength of the rock masses, and the instability of the rock mass engineering will occur under these complex boundary conditions or disturbances, which poses a serious threat to the safety of people’s lives and properties nearby [ 3 ]. Therefore, an understanding of the failure mechanisms under this combination of fissures and holes will undoubtedly have important practical significances for preventing and controlling rock engineering disasters.…”

Section: Introductionmentioning

confidence: 99%

Shear Damage Simulations of Rock Masses Containing Fissure-Holes Using an Improved SPH Method

Yang

Ren

et al. 2023

Materials

View full text Add to dashboard Cite

Fissures and holes widely exist in rock mechanics engineering, and, at present, their failure mechanisms under complex compress and shear stress states have not been well recognized. In our work, a fracture mark, ξ, is introduced, and the kernel function of the smoothed-particle hydrodynamics (SPH) is then re-written, thus realizing the fracture modelling of the rock media. Then, the numerical models containing the fissures and holes are established, and their progressive failure processes under the compress and shear stress states are simulated, with the results showing that: (1) the improved SPH method can reflect the dynamic crack propagation processes of the rock masses, and the numerical results are in good agreement with the previous experimental results. Meanwhile, the improved SPH method can get rid of the traditional mesh re-division problems, which can be well-applied to rock failure modeling; (2) the hole shapes, fissure angles, fissure lengths, fissure numbers, and confining pressure all have great impacts on the final failure modes and peak strengths of the model; and (3) in practical engineering, the rock masses are in the 3D stress state, therefore, developing a high performance 3D SPH program and applying it to engineering in practice will be of great significance.

show abstract

Acquisition of normal contact stiffness and its influence on rock crack propagation for the combined finite-discrete element method (FDEM)

Cited by 37 publications

References 27 publications

Mechanical Properties of Rock Specimens Containing Pre-Existing Cracks with Different Dip Angles Based on Energy Theory and Cohesive Element Method

Mechanical Properties of Rock Specimens Containing Pre-Existing Cracks with Different Dip Angles Based on Energy Theory and Cohesive Element Method

Investigating the Influence of Varied Particle Sizes on the Load-Bearing Properties of Arrester Bed Aggregates

Shear Damage Simulations of Rock Masses Containing Fissure-Holes Using an Improved SPH Method

Contact Info

Product

Resources

About