Model experimental study on the effects of in situ stresses on pre-splitting blasting damage and strain development

Yang, Aiyun; Chen, Siyu; Fang, Shizheng; Huang, Chen; Xie, Huanzhen

doi:10.1016/j.ijrmms.2020.104587

Cited by 35 publications

(10 citation statements)

References 22 publications

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“…The damage of the gypsum block decreased with the increase in uniaxial pressure. The article studied the influence law and the response of the main crack induced by blasting the initial static stress field using dynamic and static loading experimental equipment to simulate static stress field, and a digital laser dynamic caustic system was used to collect data (Yang et al, 2021). The findings revealed that the combined action field of the initial static stress and the dynamic blasting stress field gave priority to the maximum crack propagation along the initial static stress direction (Yang and Ding, 2018).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Fracturing Characteristics of Double-Hole Blasting Under Static Stresses

et al. 2022

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This study aims to investigate the fracturing characteristics of double-hole blasting under the action of coupled static stress and delayed time explosion. A total of thirteen explosive tests were carried out on rectangular concrete blocks with different constraints. The test blocks were wrapped in steel mesh in the test bed to prevent flying away of the cracked blocks after blasting. After blasting, the surface area of the crater was measured, and all pieces of the cracked blocks were collected, screened, and analyzed. The experimental results show that (1) the shape of free-surface craters was affected by static stress. The surface area and overall volume of the craters increased in the direction of loading stress. (2) The crater under simultaneous initiation was larger than that under delayed initiation when the tested block had a single free surface. (3) The fragmentation of blasting is closely related to the static confining pressure and delay initiation applied on the tested specimens. It is believed that this research will contribute to the design of multi-hole blasting in the deep geological body in the respect of the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Fracturing Characteristics of Double-Hole Blasting Under Static Stresses

et al. 2022

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“…Mining deeper into the earth and extracting resources from depth is gradually becoming the norm. The deeply buried rock has complex mechanical properties, and high in-situ stress is an important factor affecting blasting excavation (Yang et al., 2021). Thus, deep resource extraction faces the risks of the special mechanical behavior exhibited by the extraction disturbance (Ghorbani et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Physical model test and numerical simulation study of cumulative damage to deep tunnel surrounding rock under cyclic blasting load

Huang

Chen

Liu

et al. 2022

International Journal of Damage Mechanics

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Cyclic blasting excavation of a deep tunnel frequently disturbs the surrounding rock, and cumulative damage effect will occur in cases multiple blasts are applied. To study the damage evolution trend of tunnel surrounding rock under multiple cyclic blasting load, a self-made physical model test system was used to test cyclic blasting excavation of a tunnel under high in-situ stress. Meanwhile, according to the characteristic that the damage of rock under frequent disturbance will appear cumulative superposition, an improved Bingham creep damage constitutive model was established. The constitutive model was applied to the numerical simulation of tunnel cyclic blasting excavation, and the numerical simulation reproduced the physical model test to study the rock damage evolution laws. The results from the physical model test and the numerical simulation revealed that the process of damage evolution of rock in in-situ stress state under the impact of multiple blasting disturbances had a non-linear cumulative characteristic. In addition, the results also shed light on the relationship between the damage zone expansion and the number of cyclic blast. This paper can provide a reference for studies of the damage evolution in deep rock under blasting impact.

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“…Besides, Wang et al [10] verified the synergistic antireflection technology of hydraulic fracturing and deep hole presplitting blasting in low permeability coal seam by field engineering test. Moreover, Yang et al [11] obtained the deformation characteristics and failure mechanism of DHPB through numerical simulation and model test of specimens under horizontal compressive stress, compressive vertical stress, and noncompressive stress, as well as morphological analysis of presplitting cracks after presplitting blasting. What is more, Cheng et al [12] put forward the pressure relief technology of advanced deep hole nonthrough directional presplitting blasting.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Vibration Reduction Technology of Hole-by-Hole Presplitting Blasting

Wang

et al. 2021

Geofluids

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In order to effectively reduce the disturbance of the precrack blasting vibration on slope rock mass, except paying attention to the damping effect of the precrack, it is also necessary to optimize the blasting parameters and initiation mode of the precrack itself. Based on the blasting theory and empirical formula, the parameters of presplitting blasting such as the hole diameter, hole spacing, charge decoupling coefficient, and line charge density were determined, and field tests of conventional pre-splitting blasting and presplitting blasting with precise delay and hole-by-hole initiation were carried out on the west slope of Buzhaoba. Regression analysis was carried out on the vibration monitoring data, and the blasting vibration attenuation regularity of slope particles was obtained. By comparing the monitored vibration velocity of the two presplitting blasting tests and the forecast results of theoretical calculation, the average reduction rate of the conventional same row blasting vibration is 26.40%, while that of the hole-by-hole blasting vibration can reach 41.45% with a half hole rate of 80.7% and an irregularity of about 130 mm. Results show that the effect of precise delay initiation between preholes based on the digital electronic detonator is better than that of the simultaneous initiation of preholes. Therefore, it is suggested that the hole-by-hole presplitting blasting technology should be applied in the excavation of boundary slope and the treatment of high and steep slope.

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Model experimental study on the effects of in situ stresses on pre-splitting blasting damage and strain development

Cited by 35 publications

References 22 publications

Experimental Study on Fracturing Characteristics of Double-Hole Blasting Under Static Stresses

Experimental Study on Fracturing Characteristics of Double-Hole Blasting Under Static Stresses

Physical model test and numerical simulation study of cumulative damage to deep tunnel surrounding rock under cyclic blasting load

Experimental Study on Vibration Reduction Technology of Hole-by-Hole Presplitting Blasting

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