Multi-planar detection optimization algorithm for the interval charging structure of large-diameter longhole blasting design based on rock fragmentation aspects

Wang, Mingzheng; Shi, Xiuzhi; Zhou, Jian; Qiu, Xianyang

doi:10.1080/0305215x.2018.1439943

Cited by 64 publications

(15 citation statements)

References 17 publications

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“…Under the coupled action of high stress, blasting vibration, and unloading disturbance, the cracks in surrounding rocks are induced to expand and the strength is weakened forming an unstable area [1,[16][17][18]. e unstable area is also called the excavation damage zone (EDZ) [14,15].…”

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

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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).

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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

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“…As a strain-rate sensitive material, the mechanical properties of a rock are affected by dynamic loading and confining pressure and have received a great deal with attention in many engineering fields, particularly excavation-induced seismicity, rockbursts during tunnel excavation and mining activities [1][2][3][4][5]. e dynamic mechanical properties of rock under confining pressure have been widely investigated using many approaches, such as numerical simulations and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Compressive Characteristics of Sandstone under Confining Pressure and Radial Gradient Stress with the SHPB Test

Wang

Liu

Zhou

et al. 2018

Advances in Civil Engineering

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Research on the dynamic compressive characteristics of sandstone under radial gradient stress and confining pressure is conducive to understanding the characteristics of the surrounding rock, especially in an excavation operation for an underground mine roadway and tunnel. The present work aimed at studying the effects of radial gradient stress and confining pressure on the impact of compression of sandstone using a large-diameter split Hopkinson pressure bar. The results showed that the dynamic strength of sandstone under radial gradient stress increased with strain rate following a power function, and the dynamic strength of the sandstone under radial gradient stress was lower and more sensitive to strain rate. The increase in strain at peak stress (peak strain) was linearly correlated with the strain rate under different confining pressures. The sensitivity of the peak strain to confining pressure was lower for the sandstone with a hole, while the values of the elastic modulus were decreased. However, further increasing the stain rate would lead to an increase in the elastic modulus. Also, the ductility of the sandstone with a hole tested in this study was found to improve more significantly. Finally, with an increase in the incident energy, the absorbed energy per unit volume would increase, but would not be affected obviously by the radial gradient stress.

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“…As one of the most commonly used building materials, the mechanical properties of concrete must meet design requirements after 28 days of curing, which is in contradiction with modern construction methods that are dedicated to shortening the construction period. To accelerate the construction progress, multi-subsection blasting methods [1] have always been used, while the effectiveness of the supporting structure at an early age is inevitably affected by the blasting impact loading. The main problem in this task is that the supporting structure at an early age responds to the blasting impact loading which may cause cracks and microseismic events at the same time [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests

Wang

Dong

Zhou

2018

Shock and Vibration

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The effect of early age on the mechanical properties of concrete was investigated in this study. A uniaxial compression test was performed on split Hopkinson pressure bar (SHPB) equipment with a large diameter of 75 mm. The experimental results indicated that before 7 days, concrete showed viscoelasticity and had good deformation ability and low sensitivity to incident energy. In addition, the concrete exhibited the characteristics of quasi-brittle materials, and the sensitivity of the incident energy improved with age. The threshold value of the incident energy at early ages had an insignificant effect on the stable age concrete. The threshold value was 50% of the corresponding age’s critical incident energy, while it was 75% after 7 days.

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Multi-planar detection optimization algorithm for the interval charging structure of large-diameter longhole blasting design based on rock fragmentation aspects

Cited by 64 publications

References 17 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 Compressive Characteristics of Sandstone under Confining Pressure and Radial Gradient Stress with the SHPB Test

Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests

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