Formulation and implementation of elastoplastic constitutive model for carbonaceous slate

Li, Huayun; Zhu, Kaicheng; Chen, Yelei; Chen, Bingguang; Zeng, Bowen; Zhang, Zhiqiang

doi:10.1007/s10064-023-03099-2

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Xie et al [12] used a scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and an X-ray diffraction (XRD) to characterize the microstructure and mineral composition of carbonaceous shale, carried out uniaxial compression tests on carbonaceous shale with different water contents, analyzed its stress-strain relationship, deformation characteristics, and failure mode, and discussed the influence mechanism of water content on its mechanical properties. In terms of numerical simulation, Li et al [13] established a transversely isotropic elasticplastic constitutive model of carbonaceous shale, and obtained the material parameters of carbonaceous shale with different bedding angles by triaxial compression tests. Then, the mechanical behavior of carbonaceous shale under different confining pressures was numerically simulated by using the subroutine user-defined material mechanical behavior (UMAT) in ABAQUS.…”

Section: Introductionmentioning

confidence: 99%

Study on the Degradation Effect of Carbonaceous Shale under the Coupling Effect of Chemical Erosion and High Temperature

Xiong,

Chen,

et al. 2024

Materials

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The southwest region of China has abundant groundwater and high-temperature geothermal energy. Carbonaceous shale, as one of the typical surrounding rocks in this region, often suffers from deterioration effects due to the coupled action of groundwater chemical erosion and high temperature, which affects the long-term stability of tunnel engineering. In order to investigate the deterioration effects of carbonaceous shale under the coupled action of chemical erosion and high temperature, carbonaceous shale from a tunnel of Lixiang Railway in Yunnan Province was taken as the research object. The microstructure and mineral composition of the samples before and after chemical erosion were obtained with a scanning electron microscope-energy dispersive spectrometer and an X-ray diffraction test. Then, triaxial compression tests were conducted on the samples under different time points and different temperature effects of chemical erosion, and the stress–strain curves and the deterioration laws under a single factor were obtained. An improved numerical simulation method based on the parallel bond model was developed, which can account for the coupled effects of chemical erosion and high temperature on the rock. By simulating the triaxial compression test of carbonaceous shale, the deterioration law of carbonaceous shale under the coupled action was discussed. The results show that chemical erosion has a significant deterioration effect on the triaxial compressive strength of carbonaceous shale, and the degree of deterioration is related to the erosion time. In the first 30 days of erosion, the triaxial compressive strength of carbonaceous shale decreased by 11.38%, which was the largest deterioration range. With the increase in erosion time, the deterioration rate gradually decreased; temperature had a significant threshold effect on the strength of carbonaceous shale, and a clear turning point appeared at about 200 °C. By simulating the deterioration effects of carbonaceous shale under the coupled action of chemical erosion and high temperature, it was found that the longer the duration of chemical erosion, the stronger the temperature sensitivity of carbonaceous shale, and the more serious the loss of compressive strength during the heating process. When the temperature was low, the strength of carbonaceous shale changed little, and some samples even showed an increase in strength; when the temperature was high, the strength of carbonaceous shale decreased significantly, showing deterioration characteristics. The numerical simulation method was compared and verified with the indoor test results, and it was found that the numerical calculation had a good agreement with the test results.

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Section: Introductionmentioning

confidence: 99%

Study on the Degradation Effect of Carbonaceous Shale under the Coupling Effect of Chemical Erosion and High Temperature

Xiong,

Chen,

et al. 2024

Materials

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“…Cohesion, as a critical mechanical parameter of rock, demonstrates significant variance between plastic and elastic zones and this discrepancy could have a substantial impact on the overall stability of the tunnel. Therefore, it is essential to establish corresponding constitutive models based on the characteristics of the surrounding rock in practical engineering situations [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

The Secondary Development and Application of the Improved Nishihara Creep Model in Soft Rock Tunnels

Deng,

Shi,

et al. 2023

Buildings

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Given the complexity and diversity of rock formations, existing constitutive models struggle to accurately portray their mechanical properties, leading to substantial discrepancies between numerical simulation outcomes and reality. This inadequacy fails to meet the demands of numerical analysis in practical engineering. This study first analyzes the physical and mechanical properties of thin-layered carbonaceous phyllite. Subsequently, an improved Nishihara rheological constitutive model is established based on these analyses. Utilizing the secondary development function offered by FLAC3D, the proposed model is further developed. The program’s correctness and reliability are confirmed through a numerical simulation using the triaxial creep test from existing research. Finally, the established constitutive model is applied in the numerical simulation of an actual soft rock tunnel engineering, obtaining results compared to real monitoring data. The results demonstrate that the improved Nishihara model is more effective at describing the creep deformation characteristics of soft rock. Moreover, the findings from this study can serve as a theoretical reference for predicting deformation in soft rock tunnel engineering.

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Failure and Fracture Process Characteristics of Layered Slate: Experimental Observation and Discrete Element Modeling

Zhu

Wei

2023

Geotech Geol Eng

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Formulation and implementation of elastoplastic constitutive model for carbonaceous slate

Cited by 6 publications

References 41 publications

Study on the Degradation Effect of Carbonaceous Shale under the Coupling Effect of Chemical Erosion and High Temperature

Study on the Degradation Effect of Carbonaceous Shale under the Coupling Effect of Chemical Erosion and High Temperature

The Secondary Development and Application of the Improved Nishihara Creep Model in Soft Rock Tunnels

Failure and Fracture Process Characteristics of Layered Slate: Experimental Observation and Discrete Element Modeling

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