Stability analysis of underground surrounding rock mass based on block theory

Lin, Jianyun; Zuo, Yujun; Jian, Wang; Zheng, Lujing; Chen, Bin; Sun, Wenjibin; Liu, Hao

doi:10.1007/s11771-020-4527-3

Cited by 13 publications

(7 citation statements)

References 43 publications

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“…For each engagement of the cycloid gear with the needle tooth, the friction distance is determined as [13]:…”

Section: Amount Of Wear and Tearmentioning

confidence: 99%

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Investigation of the impact of cycloidal gear pin tooth wear on transmission error in precision planetary cycloidal reducers

Xu,

Wei,

Gui

et al. 2024

Int. J. Metrol. Qual. Eng.

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In light of the alteration pattern of transmission error following wear of a cycloid gear and needle tooth, this study employs the precision planetary cycloidal 80E reducer as an example. Theoretical deduction and simulation analysis of the change in transmission error were conducted, relying on the Archard wear model and an error model. Utilizing the principles of Archard wear theory and error theory, a functional relationship between wear duration and transmission error is deduced. Subsequently, a dynamic simulation of the 3D model is executed using ADAMS software, and the simulation results are processed with MATLAB software. A comparative and analytical examination is conducted between the theoretical curve and the simulation curve of transmission error to explore the influence of the cycloid gear and needle tooth wear on transmission error. Finally, the precision of the simulation results is further confirmed through experimental validation. The findings revealed that the transmission error curve gradually increased during the initial wear of the cycloid gear and the needle tooth, with the rate of increase increasing proportionally with wear duration. By comparing the theoretical calculations, simulation outcomes, and experimental results, the validity and accuracy of the transmission error calculations grounded in Archard wear theory and error theory are confirmed. This research provides a theoretical basis for accurately predicting the survival of precision planetary cycloidal reducers throughout the lifespan.

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“…For each engagement of the cycloid gear with the needle tooth, the friction distance is determined as [13]:…”

Section: Amount Of Wear and Tearmentioning

confidence: 99%

“…Excluding other error factors, the transmission error resulting from wear can be calculated using equations (11) through (13):…”

Section: Calculation Of the Transmission Error After Wearmentioning

confidence: 99%

Investigation of the impact of cycloidal gear pin tooth wear on transmission error in precision planetary cycloidal reducers

Xu,

Wei,

Gui

et al. 2024

Int. J. Metrol. Qual. Eng.

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“…One was to use the product of likelihood and degree of exposure to characterize the risk of damage of accident, which will change with the change in time and space, characterizing the randomness and unpredictability of the accident, as shown in Formula (25). In the other, the product of likelihood and intensity of event are used to characterize the risk of failure of accident, which does not change with time and space, characterizing the orderliness and controllability in risk control, as shown in Formula (26). The overall architecture design of the system is shown in Figure 2, including data, algorithm, and application layers.…”

Section: Risk Valuementioning

confidence: 99%

“…Risk analysis and evaluation refers to the process of analyzing the nature of accidents that may be caused by hazards, conducting risk evaluations according to the likelihood and consequence of hazards, and determining risk levels [24][25][26]. As an important means of accident prevention and control, risk analysis and evaluation are widely used in the field of industrial production safety.…”

Section: Introductionmentioning

confidence: 99%

A Risk Characterization Model and Visualization System in Aluminum Production

et al. 2023

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Electrolytic aluminum operation accidents have caused great losses to countries and people. Therefore, taking two typical accidents of explosion and leakage in electrolytic aluminum production as the research object, the form of accident risk characterization was explored and a risk characterization visualization system was designed. Based on the methods of risk assessment and characterization, the likelihood and consequence of accidents were studied. The influencing factors of likelihood and a type of Euclidean distance formula were used to characterize the likelihood. The consequence portion was characterized by two components, with one being the failure degree determined by the accident and the other being the exposure degree of people and equipment. The intensity of event was used to characterize the failure degree and the spatial search model was used to characterize the exposure degree. Finally, the visual system of electrolytic aluminum operation accidents was established based on the risk characterization model.

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“…A rock mass is a complex geological body with obvious nonlinearity, discontinuity, heterogeneity, and anisotropy. Within a rock mass, there can be joints, cracks, bedding, schistosity, faults, folds, and other structural planes [1][2][3][4]. All these different types of structures are collectively referred to as joints, and a rock mass containing various joints is termed as the jointed rock mass.…”

Section: Introductionmentioning

confidence: 99%

Research on the Strength Characteristics and Crack Propagation Law of Noncoplanar Nonthrough Jointed Rock Mass by PFC2D

Chen

Liu

Mei

et al. 2021

Advances in Civil Engineering

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In this study, five groups of numerical models with different conditions were established by using PFC2D (particle flow code) to simulate the direct shear tests of noncoplanar nonthrough jointed rock mass. It is proved that normal stress and shear rate, as well as the connectivity rate, relief angle, and inclination angle of joints, have significant influence on the strength characteristics, number of cracks, and the stress of the rock mass according to measurement taken at five different measurement circles in the rock mass. Moreover, it is determined that in the process of shearing, no matter which group of tests are conducted, the number of cracks in the rock mass caused by tension is far more than that caused by the shear action. In other words, the failure of rock mass with different planes and discontinuous joints is mainly caused by the tension in the process of the direct shear test.

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Stability analysis of underground surrounding rock mass based on block theory

Cited by 13 publications

References 43 publications

Investigation of the impact of cycloidal gear pin tooth wear on transmission error in precision planetary cycloidal reducers

Investigation of the impact of cycloidal gear pin tooth wear on transmission error in precision planetary cycloidal reducers

A Risk Characterization Model and Visualization System in Aluminum Production

Research on the Strength Characteristics and Crack Propagation Law of Noncoplanar Nonthrough Jointed Rock Mass by PFC2D

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