Experimental Studies on Mechanical Properties of Rock Joints under Dynamic Loading

Li, Hai Bo; Feng, Hai Peng; Liu, Bo; Li, Jun Ru

doi:10.4028/0-87849-415-4.1709

Cited by 4 publications

(9 citation statements)

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“…Most of the cracks under compression are parallel to the loading direction, which is different from that in the simulation of LDB granite. Even though failure pattern of sample C-Q1 is shear failure found in [39], split failure pattern is observed in another sample, C-Q2 under uniaxial compression loading. The cracks of the quartzite form a line perpendicular to the loading direction, which results in failure of the specimen.…”

Section: Modelling Of Quartzitementioning

confidence: 86%

“…In this section, the Lac du Bonnet (LDB) granite which are widely used for model calibration and a quartzite studied in [39] under uniaxial compression and direct tension are modelled with the NET-BPM. Firstly, two specimens are created and the micro parameters in our model are determined for the two rocks.…”

Section: Application Of the Net-bpmmentioning

confidence: 99%

“…A rock specimen with the size same as that in [39] is created using the method in [44]. Since the width of the specimen is only 31 mm, Rmax = 0.6 mm and Rmin = 0.2 mm are used for the specimen preparation.…”

Section: Modelling Of Quartzitementioning

confidence: 99%

“…The parameters of specimen for the quartzite are listed in Table 4. The properties of the quartzite from experiments in [39] are listed in Table 5. Similar to that in Section 4.1, a set of micro parameters is obtained in order to get a response close to the quartzite, as listed in Table 6.…”

Section: Modelling Of Quartzitementioning

confidence: 99%

“…The stress-strain curves of the quartzite under compression and tension are presented in Figure 16. The stress-strain curves of sample C-Q1 and sample T-Q1 in [39] are presented for comparison. The results show that the stress-strain curves of the specimen modelled by the NET-BPM are in good agreement with those of the quartzite.…”

Section: Modelling Of Quartzitementioning

confidence: 99%

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Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Ouyang

Chen

2017

Applied Sciences

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Abstract:The bonded-particle model (BPM) is a very efficient numerical method in dealing with initiation and propagation of cracks in rocks and can model the fracture processes and most of macro parameters of rocks well. However, typical discrete element method (DEM) underestimates the ratio of the uniaxial compressive strength to the tensile strength (UCS/TS). In this paper, a new DEM method with a nonlinear elastic tensile model embedded in BPM is proposed, which is named as nonlinear elastic tensile bonded particle model (NET-BPM). The relationships between micro parameters in NET-BPM and macro parameters of specimens are investigated by simulating uniaxial compression tests and direct tension tests. The results show that both the shape coefficient of the nonlinear elastic model and the bond width coefficient are important in predicting the value of UCS/TS, whose value ranging from 5 to 45 was obtained in our simulations. It is shown that the NET-BPM model is able to reproduce the nonlinear behavior of hard rocks such as Lac du Bonnet (LDB) granite and the quartzite under tension and the ratio of compressive Young's modulus to tensile Young's modulus higher than 1.0. Furthermore, the stress-strain curves in the simulations of LDB granite and the quartzite with NET-BPM model are in good agreement with the experimental results. NET-BPM is proved to be a very suitable method for modelling the deformation and fracture of rock-like materials.

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Section: Modelling Of Quartzitementioning

confidence: 86%

Section: Application Of the Net-bpmmentioning

confidence: 99%

Section: Modelling Of Quartzitementioning

confidence: 99%

Section: Modelling Of Quartzitementioning

confidence: 99%

Section: Modelling Of Quartzitementioning

confidence: 99%

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Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Ouyang

Chen

2017

Applied Sciences

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Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles

et al. 2021

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Based on the sandstone from the slope of Baorixile open-pit mining area in Hulunbuir City, Inner Mongolia, the dynamic uniaxial compression test of sandstone with different freeze-thaw cycles has been carried out by Split Hopkinson Pressure Bar test (SHPB). The test results show that the crushing degree of sandstone becomes serious with the freeze-thaw cycle times and strain rate increases. The dynamic compressive strength increases with the raise of strain rate under the same freeze-thaw cycles, while it reduces with the increases of freeze-thaw cycles at the same strain rate. It is found that the 10 freeze-thaw cycles are an obvious inflection point. When it is less than 10 cycles, the dynamic compressive strength of sandstone specimens decreases rapidly, it is more than 10 cycles, and the strength decreases gradually. This is due to that the evolution progress of pores in sandstone is more uniform after a certain number of freeze-thaw cycles. Meantime, the effect of freezing and thawing is mostly restrained by the pore evolution. On the other hand, the dissipated energy required for sandstone failure grows up with the increase of the number of freeze-thaw cycles. It shows that more energy is needed for the engender of pores and fractures in sandstone caused by freeze-thaw cycle. This led to the deterioration of sandstone structural stability and the decrease of dynamic mechanical properties.

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Experimental Study on Dynamic Mechanical Property of Cemented Tailings Backfill by SHPB

Tan¹,

Yu²,

Xu³

et al. 2018

Preprint

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In recent years, cemented tailings/paste backfill (CPB) become more and more important to maintain mine structure and keep mining stope to be stable in deep underground mining. Deep mining process often accompanied by blasting, rock burst and other high-speed dynamic loading. So it’s important to make research on dynamic behavior and characteristics of CPB. In this paper, a series of dynamic loading tests on CPB specimens by SHPB were taken to study the characteristic of stress-strain, dynamic strength, deformation and failure of CPB. The experimental results revealed that some CPB specimens have 1~2 lower stress peaks after reaching the peak stress before getting completely failed. The greater the cement-sand ratio was, the more obvious of strain reaction was. This property mainly showed like follows. The greater the cement-sand ratio was, the greater the dynamic compressive strength was under similar velocity impact; the dynamic compressive strength and the average strain rate were quadratic equation relationship, and the greater the cement-sand ratio was, the higher increase rate of dynamic compressive strength caused by strain rate. The dynamic compressive strength enhancement factor increased with the increase of the strain rate, and is larger than that of rock samples. The failure forms of CPB specimens under low-speed impact were almost the same as them under static uniaxial and triaxle compression. The CPB specimens were crushed broken under the critical strain rate, similar to the failure mode of low strength concrete. The experimental research results will improve our understanding the dynamic mechanical property of CPB and help to guide the strength design of deep mining backfill.

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Experimental Studies on Mechanical Properties of Rock Joints under Dynamic Loading

Cited by 4 publications

References 0 publications

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Bonded-Particle Model with Nonlinear Elastic Tensile Stiffness for Rock-Like Materials

Dynamic Mechanical Response and Dissipated Energy Analysis of Sandstone under Freeze-Thaw Cycles

Experimental Study on Dynamic Mechanical Property of Cemented Tailings Backfill by SHPB

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