Stress redistribution of dynamic loading incident with arbitrary waveform through a circular cavity

Tao, Ming; Li, Zhanwen; Cao, Wenzhuo; Li, Xibing; Wu, Chengqing

doi:10.1002/nag.2897

Cited by 46 publications

(15 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e geo-stress level has a close relationship with the fracture of surrounding rock and the onset of rock dynamic disasters in underground engineering [1][2][3][4][5][6][7][8]. In general, the geo-stress consists of two aspects: the vertical stress and horizontal stress.…”

Section: Introductionmentioning

confidence: 99%

Space‐Time Distribution Laws of Tunnel Excavation Damaged Zones (EDZs) in Deep Mines and EDZ Prediction Modeling by Random Forest Regression

Xie

Peng

2019

Advances in Civil Engineering

View full text Add to dashboard Cite

The formation process of EDZs (excavation damaged zones) in the roadways of deep underground mines is complex, and this process is affected by blasting disturbances, engineering excavation unloading, and adjustment of field stress. The range of an excavation damaged zone (EDZ) changes as the time and space change. These changes bring more difficulties in analyzing the stability of the surrounding rock in deep engineering and determining a reasonable support scheme. In a layered rock mass, the distribution of EDZs is more difficult to identify. In this study, an ultrasonic velocity detector in the surrounding rock was used to monitor the range of EDZs in a deep roadway which was buried in a layered rock mass with a dip angle of 20–30°. The space-time distribution laws of the range of EDZs during the excavation process of the roadway were analyzed. The monitoring results showed that the formation of an EDZ can be divided into the following stages: (1) the EDZ forms immediately after the roadway excavation, which accounts for approximately 82%–95% of all EDZs. The main factors that affect the EDZ are the blasting load, the excavation unloading, and the stress adjustment; (2) as the roadway excavation continues, the range of the EDZs increases because of the blasting excavation and stress adjustment; (3) the later excavation zone has a comparatively larger EDZ value; and (4) an asymmetric supporting technology is necessary to ensure the stability of roadways buried in layered rocks. Additionally, the predictive capability of random forest modeling is evaluated for estimating the EDZ. The root-mean-square error (RMSE) and mean absolute error (MAE) are used as reliable indicators to validate the model. The results indicate that the random forest model has good prediction capability (RMSE = 0.1613 and MAE = 0.1402).

show abstract

Section: Introductionmentioning

confidence: 99%

Space‐Time Distribution Laws of Tunnel Excavation Damaged Zones (EDZs) in Deep Mines and EDZ Prediction Modeling by Random Forest Regression

Xie

Peng

2019

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…Liu et al 11 employed the complex variable function to solve the dynamic stress concentration problem surrounding cavity of arbitrary shape in an infinite elastic plane, providing the computational results of the dynamic stress concentration around the cavities of circular, elliptical and horseshoe shape. Tao et al 12 solved the dynamic stress concentration around a circular cavity under the transient P wave disturbance in an infinite homogeneous medium based on the complex variable function and Fourier transform, and the dynamic stress concentration distribution around the circular cavity was observed to affect the Poisson's ratio, wave number and waveform. Li et al 13 explored the application of the complex variable function to determine the scattering of a shallow-buried circular cavity under the transient P wave loads, and analyzed the effects of cavity depth, incident angle and position of wave peak on the dynamic stress concentration factor (α ΔΣ῝Φ ) distribution.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of the different-types elliptic cylindrical inclusions subjected to plane SH-wave scattering

Tao

Luo

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

The complex boundary of the elliptical inclusion rendered it difficult to solve the problem of wave scattering. In this study, the steady-state response was analyzed using the wave function expansion method. Subsequently, the Ricker wavelet was employed as the transient disturbance and Fourier transform was used to determine the distribution of transient dynamic stress concentration around the elliptical inclusion. The effects of wave number, elliptical axial ratio and difference in material properties on the distribution of the dynamic stress concentration around the elliptical inclusion were evaluated. The numerical results revealed that the dynamic stress concentration always appeared at both ends of the major axis and minor axis of the elliptical inclusion, and the difference in material properties between the inclusion and medium influenced the variations in the dynamic stress concentration factor with the wave number and elliptical axial ratio.

show abstract

“…Coal is the main energy source in China, accounting for about two-thirds of total primary energy consumption [1][2][3][4][5]. Plenty of environmental problems and natural disasters may occur during mining, i.e., roof fall, gas, fire, and dust pollution [6][7][8][9]. A large amount of dust is generated during the coal mining process, causing the high-concentration dust environments for the workers, which poses a serious threat to their health and safety [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Wetting of Coal Dust by Surfactant Solution

Jiang

Wang

Liu

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Surfactants can improve the wetting performance of the dust-reduction spraying water, thus improving the dust-reduction effect by spray. In this study, the performance of surfactant solution in wetting coal dust was investigated through experiments. In addition, the effects of surfactant type, mass fraction, metamorphic degree of coal, particle size, and additives were investigated. According to the results of surface tension experiments, the surface tension of the solution decreased with the increase of the concentration of surfactant. However, after reaching CMC, the surface tension did not have significantly decrease. SDBS and OP-10 had higher efficiency in decreasing the surface tension than the other two types of surfactants. The addition of sodium sulfate additives can further reduce the surface tension of the surfactant solution by a limited range. The coal dust wetting experiment showed that with the increase in the concentration of the surfactant, the contact angle of the droplets on the coal dust tablet was continuously reduced, and the wettability of the solution was continuously improved. The wettability of the OP-10 solution was optimal. At the same concentration, the minimum contact angle can be obtained in the OP-10 solution. As the contact angle of the coal dust increased, the growth rate in the coal dust reverse osmosis moisture absorption of the surfactant solution relative to the pure water increased. After the addition of sodium sulfate, the reverse osmosis moisture absorption of coal dust increased to varying degrees. In addition, as the concentration of additives increased, the moisture absorption of coal dust increased.

show abstract

Stress redistribution of dynamic loading incident with arbitrary waveform through a circular cavity

Cited by 46 publications

References 30 publications

Space‐Time Distribution Laws of Tunnel Excavation Damaged Zones (EDZs) in Deep Mines and EDZ Prediction Modeling by Random Forest Regression

Space‐Time Distribution Laws of Tunnel Excavation Damaged Zones (EDZs) in Deep Mines and EDZ Prediction Modeling by Random Forest Regression

Dynamic analysis of the different-types elliptic cylindrical inclusions subjected to plane SH-wave scattering

An Experimental Study on Wetting of Coal Dust by Surfactant Solution

Contact Info

Product

Resources

About