Influence of joint angle on the instability failure characteristics and AE evolution law of underground caverns

Wang, Xiao; Wu, Na; Li, Hong; Yan, Yatao

doi:10.1080/19648189.2020.1837252

Cited by 16 publications

(9 citation statements)

References 23 publications

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“…As the most common load-bearing medium, rock widely exists in geotechnical engineering, such as mine surrounding rock tunnels and underground protection projects [1][2][3][4][5][6][7]. Affected by human excavation activities, rock masses are in varying degrees of damage under the disturbance of cyclic loads with different upper-stress limits [8][9][10]. e superimposition of damage leads to the evolution of the rock mass from the rupture of the internal mesostructure to the external macroscopic deformation and destruction.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading‐Unloading

Xie

et al. 2021

Shock and Vibration

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For the bearing rock in geotechnical engineering, it is frequently affected by external loads. This paper adopted different upper limits of stress to carry out cyclic loading-unloading on the sandstone specimens to make them in different damage degrees and analyzed the mechanical mechanism of the damaged sandstone under different stresses. Then, the strength change and energy evolution of sandstone with different damage degrees were analyzed, and the damage of the loaded sandstone was quantitatively characterized. The experimental results showed that the strength and plastic deformation of sandstone after cyclic loading-unloading with different upper-stress limits gradually decreased with the increase of the upper-stress limit. In the loading-unloading stages of cyclic loading-unloading, the elastic modulus increased with the increase of the upper-stress limit. In general, as the number of cycles increased, the total strain energy density and elastic deformation energy density gradually increased, and as the upper-stress limit increased, both of them also increased. The damage factor of sandstone after cyclic loading-unloading, which was characterized by dissipated energy, increased in an S-shape with the increase of the upper-stress limit, and the growth rate first increased and then decreased.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading‐Unloading

Xie

et al. 2021

Shock and Vibration

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“…As a common bearing medium in nature, rock mass widely exists in geotechnical engineering such as tunnel, subway, rock slope, and coal mine roadway [1][2][3][4][5][6][7]. In the long period of geological history, the rock has experienced the geological tectonic movement, so that there are different degrees of joints, fissures, and other weak surfaces in the rock, and in different degrees of damage state [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Energy Dissipation Characteristics of Damaged Sandstone under Impact Load

Feng

Wang

et al. 2021

Shock and Vibration

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Before rock burst, coal, and gas outburst dynamic load, rock mass in geotechnical engineering has been an indifferent degree of damage. The dissipation energy of rock mass under dynamic load reflects the difficulty of rock breaking. In view of the energy dissipation of damaged rock mass under dynamic load, the cyclic loading and unloading test is carried out to make sandstone in different damage states, and the damage degree of sandstone is characterized by the change of longitudinal wave velocity before and after cyclic loading and unloading. Then, the rock with different damage degrees is tested by adopting the split Hopkinson pressure bar (SHPB). Finally, the energy dissipation characteristics of damaged rock under impact load are analyzed. The results show that the damage factor of sandstone increases with the increase of the upper limit of stress after cyclic static loading. The dynamic strength and peak strain of damaged sandstone increase with the increase of impact pressure and decrease with the increase of damage degree. With the increase of damage degree of sandstone, the reflection energy and dissipation energy of sandstone increase, while the transmission energy decreases.

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“…With the development of economy and the increase of population, the development scale and depth of underground tunnel engineering are increasing (Wang et al, 2020;Zhao et al, 2021). At present, the deepest tunnel project in the world has reached 1500m.…”

Section: Introductionmentioning

confidence: 99%

Unloading Response Characteristics of Cross Fault Caverns: Effect of Fault Angles

2021

Geotech Geol Eng

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The research of unloading response characteristics of caverns with weak structure has important engineering value for the development and construction of underground space. In this paper, rstly, the cross fault cavity model is established based on particle ow code (PFC) software, considering different fault dip angles. The parallel bond model (PBM) is used in the cavern model and the smooth joint model (SJM) is used in the fault model. Then, the mechanical, acoustic emission (AE), energy response characteristics and failure modes of the cavern model with different fault angles are explored. The research result show that the fault angle has a great in uence on the stress distribution and failure modes of surrounding rock.The existence of faults does not change the overall law of AE evolution curve, that is, the number of AE hits increases rst and then decreases. However, the existence of faults changes the maximum number of AE hits and the duration of AE. When the cavern is unloaded, the strain energy of the model rst decreases and then increases.

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Influence of joint angle on the instability failure characteristics and AE evolution law of underground caverns

Cited by 16 publications

References 23 publications

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading‐Unloading

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading‐Unloading

Analysis of Energy Dissipation Characteristics of Damaged Sandstone under Impact Load

Unloading Response Characteristics of Cross Fault Caverns: Effect of Fault Angles

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