Fundamental studies on dynamic properties of rock joint under cyclic loading using mortar and Ryoke gneiss

Tsubota, Yorimasa; Kunishi, Tatsuo; Iwakoke, Y; Yoshinaka, Ryo; Yamaguchi, K

doi:10.1201/b14916-24

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Ju (2006) et al [17] conducted SHPB tests on the rock with different roughness joints on rock specimens with energy dissipation and fractal dimension. Y. Tsubota (2014) et al [18] dynamic experiments with naturally jointed Ryoke gneisses revealed the effects of rock roughness, hardness, and weathering on the shear resistance of rocks, but the conclusions apply only to Ryoke gneisses. Liu (Liu et al (2014(Liu et al ( , 2016)) et al [19][20] used precast joint specimens to reveal the relationship between joint rock masses and dynamic strength and damage modes.…”

Section: Introductionmentioning

confidence: 99%

Calculation method of HJC constitutive model parameters of natural joint angle slate

Wan

Tao

Tian

et al. 2023

Preprint

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In the course of underground engineering, geological conditions of layered slate are often encountered. Understanding the mechanical characteristics of layered slate is a prerequisite for engineering construction and disaster prevention and mitigation. As a result, at the beginning of the project, a large number of indoor tests were required, which is time-consuming and laborious. At the same time, the natural joint angle of the layered slate is random, so it is extremely difficult to establish a database of the mechanical characteristics of the layered slate. Therefore, it is urgent to find a simple and feasible method to determine the mechanical characteristics of the layered slate at a natural dip angle. Static test, Split-Hopkinson-Pressure-Bar (SHPB) test, and sensitivity analysis method are used in this paper. Taking five special joint angles (0 °, 30 °, 45 °, 60 °, 90 °) slate as the research object, the calculation method of Holmquist-Johnson-Cook (HJC) constitutive model parameters of natural joint angle slate are constructed, and the relationship between the HJC model parameters and the joint dip angle of slate is deduced. The results will provide a simple and feasible numerical simulation method for slate dynamics analysis.

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Section: Introductionmentioning

confidence: 99%

Calculation method of HJC constitutive model parameters of natural joint angle slate

Wan

Tao

Tian

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In order to research the effect of joint rock parameters on rock failure, Zou et al [33][34][35] explored the mechanical properties of jointed rocks using uniaxial compression tests by presetting joints with different angles in simulated materials. Tsubota et al [36] conducted dynamic tests on natural rock joints using Ryoke gneiss to reveal the mechanical properties of natural joints and concluded that rock joint surface conditions such as roughness, hardness, and degree of weathering have significant effects on shear strength.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Behavior of Rock Specimens with Varying Joint Roughness and Inclination under Impact Load

Yuan

Chen

et al. 2023

Applied Sciences

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The influence of joint roughness and inclination on the dynamic mechanical properties of rocks is a prominent research area. In order to investigate the effects of joint roughness and inclination on the dynamic mechanical properties of jointed rocks, impact tests were conducted using a spilt Hopkinson pressure bar (SHPB) apparatus for prefabricated serrated joint cement mortar specimens with varying joint roughness and inclination. The failure mode, stress wave propagation characteristics, peak stress, and stress wave energy transfer law under impact load were analyzed. The results indicate that both joint inclinations and joint roughness coefficients (JRC) have a strong influence on the failure mode, peak stress, and stress wave energy transfer of jointed specimens. The jointed specimens exhibit three distinct failure modes under impact load, namely splitting tensile failure, shear slip failure, and compound failure of splitting tensile and shear. The peak stress initially decreases then increases with the increase in joint inclination angle, namely a V-shape variation, while it gradually increases with JRC increasing from 0 to 20. Jointed specimens exhibit the lowest peak stress at an inclination angle of 45° and JRC of 0. The variation of transmitted energy coefficient is similar to the peak stress, while the variation of reflected energy coefficient is opposite to the peak stress. At joint inclination angles of 0° or 90°, the reflected energy coefficient increases with the increase of JRC from 0 to 20, while the transmitted energy decreases. However, when the joint inclination angle is in the range of 30° to 60°, the reflected energy coefficient gradually decreases with JRC increasing, while the transmitted energy coefficient gradually increases.

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“…Te results showed that the dynamic compressive strength and peak strain of the specimens frst decreased and then increased with increasing joint inclination angle. Tsubota et al [24] took gneiss as the research object, carried out dynamic tests on natural rock joints, revealed the mechanical properties of natural joints for the frst time, and concluded that the surface conditions of rock joints, such as roughness, hardness, and degree of weathering, have a signifcant impact on the shear resistance of rocks. Niktabar et al [25] conducted shear tests on joint specimens with diferent rough undulation angles and found that the shear strength of the specimens is in direct proportion to the rough undulation angle.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Dynamic Mechanical Properties of a Jointed Rock Mass under Impact Loading

Feng

Wang

et al. 2022

Shock and Vibration

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The propagation law of blast stress waves in jointed rock masses is closely related to the characteristics of the joint filling medium. The water content and thickness of the filling medium affect the propagation characteristics of the blast stress wave in the joint surface. Based on similarity theory, mortar-red clay-mortar composite specimens with different moisture contents (36%, 39%, 42%, and 45%) and medium thicknesses (3 mm, 6 mm, and 9 mm) were prepared with red clay as the filling medium. The dynamic uniaxial compression test of the specimen under different strain rates was carried out by using a variable cross-section split Hopkinson compression bar with a diameter of 50 mm. The effects of strain rate, moisture content, and medium thickness on the stress wave propagation characteristics, dynamic stress-strain curve, peak stress, crushing energy consumption density, and crushing characteristics of mortar-red clay-mortar composite specimens were analyzed. The results show that the blocking effect of joints on stress waves increases significantly with increasing filling medium thickness and water content. With increasing strain rate, the peak stress and energy of the composite specimen increase and there is an obvious strain rate effect. With the increase in the thickness and moisture content of the filling medium, the peak stress, dynamic elastic modulus, energy consumption density per unit volume, and crushing degree of the specimen gradually decrease and the nonlinear deformation is more obvious. There is a good linear relationship between the peak stress and the thickness and moisture content of the filling medium. The existence of joints greatly weakens the damage effect of stress waves on the specimens behind the joints, and with the increase in the thickness and water content of the filling medium, the degree of damage to the specimens behind the joint surface decreases under the same impact pressure and the weakening effect becomes increasingly significant.

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Fundamental studies on dynamic properties of rock joint under cyclic loading using mortar and Ryoke gneiss

Cited by 7 publications

References 2 publications

Calculation method of HJC constitutive model parameters of natural joint angle slate

Calculation method of HJC constitutive model parameters of natural joint angle slate

Dynamic Mechanical Behavior of Rock Specimens with Varying Joint Roughness and Inclination under Impact Load

Experimental Study on the Dynamic Mechanical Properties of a Jointed Rock Mass under Impact Loading

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