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Strength and Failure Characteristics of an Irregular Columnar Jointed Rock Mass Under Polyaxial Stress Conditions
Abstract The special structure of a columnar jointed rock mass (CJRM) leads to its complex mechanical properties, and accurately grasping the strength and failure behaviors of CJRMs under different stress conditions is crucial for engineering safety. According to the natural structure of the CJRM, the Voronoi diagram and three-dimensional (3D) printing technology were used to make irregular columnar jointed molds with different dip angles. Uniaxial, conventional triaxial, and true triaxial compression tests were conducted on the artificial irregular CJRM (ICJRM) specimens. The effects of the dip angle, intermediate principal stress and minimum principal stress on the stress–strain curve and failure strength of the ICJRM were analyzed. The failure modes and mechanisms of ICJRM specimens under different stress conditions were summarized. For three types of jointed rock masses, including ICJRM, the material parameters in the Mohr–Coulomb (MC) and Hoek–Brown (HB) criteria were calculated only from the conventional triaxial test results. Six 3D strength criteria related to MC and HB parameters were used to predict the polyaxial failure strengths of three jointed rock masses, and the prediction performances were compared. The results show that the Mogi criterion using MC parameters has the best overall prediction effect on the failure strengths of three jointed rock masses, while the modified Lade criterion is the best choice for the ICJRM.
Highlights Polyaxial compression tests, including uniaxial, conventional triaxial and true triaxial compression tests, are performed on the artificial irregular columnar jointed rock mass specimens.The effects of the dip angle, intermediate principal stress and minimum principal stress on the failure strength behavior of irregular columnar jointed rock mass are revealed.The failure modes and mechanisms of irregular columnar jointed rock mass specimens under different polyaxial stress conditions are summarized.The feasibilities of using the Mohr–Coulomb and Hoek–Brown parameters obtained from the conventional triaxial test results to solve the true triaxial failure strength of jointed rock masses, including the irregular columnar jointed rock mass, are verified and compared.
Strength and Failure Characteristics of an Irregular Columnar Jointed Rock Mass Under Polyaxial Stress Conditions
Abstract The special structure of a columnar jointed rock mass (CJRM) leads to its complex mechanical properties, and accurately grasping the strength and failure behaviors of CJRMs under different stress conditions is crucial for engineering safety. According to the natural structure of the CJRM, the Voronoi diagram and three-dimensional (3D) printing technology were used to make irregular columnar jointed molds with different dip angles. Uniaxial, conventional triaxial, and true triaxial compression tests were conducted on the artificial irregular CJRM (ICJRM) specimens. The effects of the dip angle, intermediate principal stress and minimum principal stress on the stress–strain curve and failure strength of the ICJRM were analyzed. The failure modes and mechanisms of ICJRM specimens under different stress conditions were summarized. For three types of jointed rock masses, including ICJRM, the material parameters in the Mohr–Coulomb (MC) and Hoek–Brown (HB) criteria were calculated only from the conventional triaxial test results. Six 3D strength criteria related to MC and HB parameters were used to predict the polyaxial failure strengths of three jointed rock masses, and the prediction performances were compared. The results show that the Mogi criterion using MC parameters has the best overall prediction effect on the failure strengths of three jointed rock masses, while the modified Lade criterion is the best choice for the ICJRM.
Highlights Polyaxial compression tests, including uniaxial, conventional triaxial and true triaxial compression tests, are performed on the artificial irregular columnar jointed rock mass specimens.The effects of the dip angle, intermediate principal stress and minimum principal stress on the failure strength behavior of irregular columnar jointed rock mass are revealed.The failure modes and mechanisms of irregular columnar jointed rock mass specimens under different polyaxial stress conditions are summarized.The feasibilities of using the Mohr–Coulomb and Hoek–Brown parameters obtained from the conventional triaxial test results to solve the true triaxial failure strength of jointed rock masses, including the irregular columnar jointed rock mass, are verified and compared.
Strength and Failure Characteristics of an Irregular Columnar Jointed Rock Mass Under Polyaxial Stress Conditions
Que, Xiangcheng (author) / Zhu, Zhende (author) / Zhou, Luming (author) / Niu, Zihao (author) / Huang, Haonan (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
| Springer Verlag | 2024
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A Polyaxial System for Testing of Jointed Rock Mass Models
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