Numerical study of the mechanical behaviour of unwelded block in matrix rocks under direct shearing

Sheikhpourkhani, AmirMohammad; Bahaaddini, Mojtaba; Oh, Joung; Masoumi, Hossein

doi:10.1007/s10064-023-03507-7

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…The results of the strong matrix samples are the same as those of Kahraman and Alber [28] and Avşar [30], and the UCS of the samples shows a decreasing trend with the increase in VBP (Figure 11), indicating that the definition of strong matrix weak rock type bimrocks has been satisfied under the strength ratio of this matrix rock. Sheikhpourkhani et al [31] studied unwelded bimrocks by means of indoor tests and numerical simulation and showed the change rule of the ratio of the sample UCS to the matrix UCS and found that with the increase in VBP, the value showed a decreasing trend, which was similar to the result of bimrocks with a strong matrix. In the following research, the mechanical properties of unwelded bimrocks should also be taken into account.…”

Section: Discussionmentioning

confidence: 85%

“…Sheikhpourkhani et al [ 31 ] studied unwelded bimrocks by means of indoor tests and numerical simulation and showed the change rule of the ratio of the sample UCS to the matrix UCS and found that with the increase in VBP, the value showed a decreasing trend, which was similar to the result of bimrocks with a strong matrix. In the following research, the mechanical properties of unwelded bimrocks should also be taken into account.…”

Section: Discussionmentioning

confidence: 93%

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An Experimental Investigation of the Effects of Block Proportion on Bimrocks, Considering Different Block-to-Matrix Strength Ratios

Hu,

Sun,

Sun

et al. 2024

Materials

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The rock block proportion is one of the most important factors affecting the mechanical properties of bimrocks. Under different block-to-matrix strength ratios, the influence of rock block proportion is different. To explore the influence of rock block proportion on the mechanical properties of specimens under different block-to-matrix strength ratios, a new indoor test method for making bimrocks was proposed. A uniaxial compression test and a direct shear test were carried out on specimens with different rock block proportions. The results show that this method can control the block-to-matrix strength ratio well, and the influence of rock block proportion is obviously different under different block-to-matrix strength ratios. The strong matrix sample will decrease significantly after reaching the peak compressive strength, while the weak matrix will decrease slowly after reaching the peak strength. The rock block proportion is negatively correlated with the uniaxial compressive strength of strong matrix samples (the reduction was 12.53%) and is positively correlated with the uniaxial compressive strength of weak matrix samples as a whole, but it changes when block proportion is more than 50%. With the increase in normal stress and rock block proportion increases from 30% to 60%, the shear failure zone of the weak matrix sample increases, and the cracks are inclined, while the strong matrix sample has more secondary cracks. The results of this study also show that the effect of volumetric block proportion (VBP) on the internal friction angle and cohesion of the sample is less related to the block-to-matrix strength ratio.

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Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 93%

An Experimental Investigation of the Effects of Block Proportion on Bimrocks, Considering Different Block-to-Matrix Strength Ratios

Hu,

Sun,

Sun

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…Detailed rigid particle models (PMs) based on the discrete element method (DEM) that take directly into account the material grain structure, namely, its randomness and its internal length, and the physical mechanisms of particle interaction can predict cracking phenomena in quasi-brittle materials and have gained relevance in rock [1][2][3][4][5], concrete [6][7][8][9][10], reinforced concrete [11,12], masonry [13,14], and asphalt mixtures [15,16]. DEM-based PM models have also been shown to be an effective tool for understanding the effect of particle shape and size on the macroscopic behaviour of granular materials and clays [17,18].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Contact Laws Accounting for Softening in 3D Rigid Concrete Particle Models

Azevedo,

Farinha,

Oliveira

2024

Buildings

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To obtain predictions closer to concrete behaviour, it is necessary to employ a particle model (PM) that considers contact softening. A bilinear softening contact model (BL) has been adopted in PM studies. Several limitations in PM predictions have been identified that may be due to BL assumptions. For this reason, this paper compares BL predictions with those obtained with more complex models to assess if PM predictions can be improved. As shown, it is possible to calibrate each contact model to reproduce the complex behaviour observed in concrete in uniaxial and biaxial loading. The predicted responses are similar, and the known PM limitations still occur independently of the adopted model. Under biaxial loading, it is shown that a response closer to that observed in concrete can be obtained (higher normal-to-stiffness ratio of ≈0.50, maximum contact compressive strength of ≈60 MPa, and 30% reduction in the number of working contacts). The BL contact model for PM concrete DEM-based simulations is shown to have (i) lower associated computational costs (15% to 50% lower); (ii) a reduced number of contact strength parameters; and (iii) similar responses to those predicted with more complex models. This paper highlights that the BL contact model can be used with confidence in PM fracture studies.

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Effect of strain rate on the failure of bimrocks using the combined finite-discrete element method

Sharafisafa,

Aliabadian,

Sato

et al. 2024

Computers and Geotechnics

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Numerical study of the mechanical behaviour of unwelded block in matrix rocks under direct shearing

Cited by 4 publications

References 37 publications

An Experimental Investigation of the Effects of Block Proportion on Bimrocks, Considering Different Block-to-Matrix Strength Ratios

An Experimental Investigation of the Effects of Block Proportion on Bimrocks, Considering Different Block-to-Matrix Strength Ratios

Assessment of Contact Laws Accounting for Softening in 3D Rigid Concrete Particle Models

Effect of strain rate on the failure of bimrocks using the combined finite-discrete element method

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