Numerical simulations of failure behavior around a circular opening in a non-persistently jointed rock mass under biaxial compression

Yang, Xu; Jing, Hongwen; Chen, Kunfu

doi:10.1016/j.ijmst.2016.05.027

Cited by 27 publications

(5 citation statements)

References 32 publications

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“…where x represents the state variable that depends on the deflection of the midspan; a and b represent the control variables. Equation (18) shows that the total potential energy function of the rock plate is consistent well with the cusp catastrophe model. The equilibrium surface function can be written as equation (19), and the equilibrium surface is presented in Figure 3 (a)…”

Section: R E T R a C T E Dsupporting

confidence: 58%

“…The appraisal of tunnel or roadway convergence in the case of stratified rock masses is complex, because the dominant discontinuities often lead to highly anisotropic rock responses. 17 The installation of bolts can change the constraints on the layered rock, 12,18 which can influence the deformation properties of the reinforced rock masses. Even though studies have claimed the influences of the bolting reinforcement on the mechanical properties of the layered or fractured rock masses, 12,19 the failure mechanism is not clear.…”

Section: Introductionmentioning

confidence: 99%

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RETRACTED: Bulking instability analysis of the horizontally stratified rock reinforced with bolts based on cusp catastrophe model

Pan

Jing

2020

International Journal of Electrical Engineering & Education

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The sedimentary rock masses are commonly seen in underground engineering, and it is a threat to the safety of underground constructions greatly. Bolt supporting reinforcement works effectively in enhancing the rock in underground engineering. In this study, the roofs made of the horizontally layered rock were simplified to the rock plate structure with two different constrains, and a cusp catastrophe model was established based on the structural mechanics. With the application of the developed cusp catastrophe model, the influences of ratio of span to thickness, the amounts, and the preload of the bolts on the stability of the stratified rock were studied. Findings show that the installation of bolts can increase the anti-bulking capacity of the layered rock. The bolts can change the failure of the layered rock from bulking failure to shear failure. Improving the integrity of the layered rock is also helpful for enhancing the resistance to the bulking instability.

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Section: R E T R a C T E Dsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

RETRACTED: Bulking instability analysis of the horizontally stratified rock reinforced with bolts based on cusp catastrophe model

Pan

Jing

2020

International Journal of Electrical Engineering & Education

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“…At the same time, in order to reduce the complexity of the DEM micromechanical parameter calibration, we selected three kinds of rock as shown in Table 1 (number 2 porphyritic granodiorite, number 3 granodiorite, and number 10 granodiorite porphyry) as the calibration objects. e DEM [28] of structures in rock or soil required calibration of the FJM parameters of materials using UCS tests [2,[32][33][34][35][36][37][38]. To simulate rocks with different UCS and PLSI, the tensile strength and cohesion of the FJM parameters were varied, while other parameters were kept constant.…”

Section: Parameters Of the Numerical Modelmentioning

confidence: 99%

Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Ren

Liu

et al. 2018

Advances in Civil Engineering

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The point load test (PLT) is intended as an index test for rock strength classification or estimations of other strength parameters because it is economical and simple to conduct in the laboratory and in field tests. In the literature, calculation procedures for cylinder cores, blocks, or irregular lumps can be found, but no study has researched such procedures for half-cylinder cores. This paper presents the numerical model and laboratory tests for half-cylinder and cylinder specimens. The results for half-cylinder and cylinder specimens are then presented, analysed, and discussed. A correlation of failure load between half-cylinder and cylinder specimens is established with a suitable size suggestion and correction factor. It is found that the failure load becomes stable when half-cylinder specimens have a length/diameter ratio higher than 0.9. In addition, the results show that the point load strength index (PLSI) of half-cylinder cores can be calculated using the calculation procedures for diametral testing on cylinder cores, and it is necessary to satisfy the conditions that the length/diameter ratio be higher than 0.9 and the failure load be multiplied by 0.8.

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“…In recent years, DIC is widely used in studying the fracture process of materials with defects such as prefabricated cracks 6 – 9 . The traditional measurement method of the crack opening displacement obtained by DIC was first proposed by M. A. Sutton et al in the 1990s 4 . This method is generally called the "virtual extensometer method".…”

Section: Introductionmentioning

confidence: 99%

Improved virtual extensometer measurement method in complex multi-fracture situation

Chai

Ouyang

Liu

et al. 2022

Sci Rep

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To overcome the limitation of the virtual extensometer method in measuring the crack opening displacement (COD) in the process of complex multi-crack propagation of rock, the measurement error of Digital Image Correlation (DIC) local deformation is theoretically analyzed. An improved virtual extensometer method for measuring the COD is proposed, which considers the temporal and spatial characteristics of crack development in the process of complex crack propagation. The accuracy of the proposed method is verified by the strain localization band numerical simulation test and indoor single crack simulation test. Furthermore, the method is applied to the two-dimensional similarity simulation test of simulating complex multi-fractures in rock stratum. The COD obtained by the traditional and improved methods is compared with the measured COD. The results show that in the case of multiple complex cracks, to obtain the COD accurately, the relative distance between the virtual extensometer measuring point and the crack should be greater than half of the sum of the width of the crack strain localization zone and the subset size. With the development of the crack, the relative distance between the virtual extensometer measuring point and the crack should increase with the increase of the width of the crack strain localization zone. The error of the COD measured by the traditional method increases with fracture development, and the maximum is 21.20%. The maximum relative error between the COD measured by the improved method and the measured crack opening is 3.61%. The research results improve the accuracy of the virtual extensometer in measuring the COD under complex multi-crack conditions.

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Numerical simulations of failure behavior around a circular opening in a non-persistently jointed rock mass under biaxial compression

Cited by 27 publications

References 32 publications

RETRACTED: Bulking instability analysis of the horizontally stratified rock reinforced with bolts based on cusp catastrophe model

RETRACTED: Bulking instability analysis of the horizontally stratified rock reinforced with bolts based on cusp catastrophe model

Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Improved virtual extensometer measurement method in complex multi-fracture situation

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