Strain Field Evolution Characteristics of Free Surface during Crater Blasting in Sandstone under High Stress

Zhang, Fengpeng; Yan, Guangliang; Yang, Qibo; Gao, Jingbo; Li, Yuanhui

doi:10.3390/app10186285

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…Figure 10 shows the maximum principal strain field prior to the appearance of cracks and the crack network during crater blasting [24,25]. The maximum principal strain field was obtained by a model experiment, where the experimental method that was used in this study as well as a digital imagine correlation (DIC) technique were used.…”

Section: Relationship Between the Strain Field Morphology And The Crack Network Morphologymentioning

confidence: 99%

“…Figure 11 shows the maximum and minimum principal strain field on the free surface that are caused by y-axis static stress [24], which were obtained by the model crater blasting experimental method that was used in this study and a DIC. Clearly, the maximum principal strain field is positive, which is the tensile strain field, whose direction is perpendicular to the static stress while the minimum principal strain field is negative, which is the compressive strain field, whose direction is parallel to the static stress.…”

Section: Mechanism Of the Uniaxial Static Stress Affecting Crackmentioning

confidence: 99%

“…Previous studies have shown that static stress has an important effect on the mechanical properties of rock, such as compressive strength, tensile strength, Poisson's ratio, and Young's modulus [21][22][23]; the static stress controls the evolution of the strain field in rock mass during rock blasting. The strain fields under uniaxial and biaxial static stress are significantly different with those that are under no static stress [24,25]. Furthermore, the static stress controls the dynamic fracture behavior of the rock.…”

Section: Introductionmentioning

confidence: 95%

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Experimental Study on the Effects of In Situ Stress on the Initiation and Propagation of Cracks during Hard Rock Blasting

et al. 2021

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In situ stress is one of the most important factors affecting rock dynamic fractures during blasting excavation of deep rock mass that generally is hard rock. In this research, crater blasting experiments on hard rock under different uniaxial static stresses were conducted to investigate the initiation and propagation process of crack networks that were induced by coupled dynamic and static loads. Furthermore, the effects of anisotropic static stress fields on the initiation and propagation of crack networks during hard rock blasting, and the crack network morphological characteristics were analyzed and elucidated. The experimental results showed that the static stress field changed the process of crack network initiation and propagation during hard rock blasting, and then control the crack network morphology. Under uniaxial static stress, the crack network was elliptical with the long axis parallel to the static stress. In addition, the larger the anisotropic static stress is, the more obvious the elliptical morphology of the crack network. Moreover, the static stress lead to the delay of crack formation which indicates that the delay time during millisecond blasting excavation of deep rock mass should be adjusted appropriately according to the in situ stress. A stress-strength ratio (SSR) of 0.15 is the threshold value where static stress may have a significant effect on the initiation and propagation of a crack network. Meanwhile, the strain field prior to crack initiation during rock blasting controlled the morphological characteristics of the crack network. Finally, the mechanism of static stress affecting propagation and morphology of crack network was revealed theoretically.

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Section: Relationship Between the Strain Field Morphology And The Crack Network Morphologymentioning

confidence: 99%

Section: Mechanism Of the Uniaxial Static Stress Affecting Crackmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Experimental Study on the Effects of In Situ Stress on the Initiation and Propagation of Cracks during Hard Rock Blasting

et al. 2021

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“…The attenuation characteristics are usually studied by comparing the frequency-spectrum evolution before and after the joint formation [8,9]. The in situ stress conditions, such as the length and velocity of the induced cracks and the dynamic stress intensity factor at the crack tip, affect the stress wave propagation [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Damage Mechanism and Wave Attenuation Induced by Blasting in Jointed Rock

Song

Zhang

et al. 2022

Geofluids

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This work uses a combination of simulations performed via numerical models and field observations studied the attenuation of deep-hole blasting stress waves and the evolution mechanism of cracks in a jointed rock mass. First, we conclude that the larger the joint angle is, the larger is the transmission coefficient and smaller is the fractal dimension. Second, the time difference between the peak stress difference and the maximum principal stress on both sides of the blasting hole in the horizontal direction of the rock mass with joints is relatively large, but there is no significant difference in the vertical direction. Finally, an unjointed-rock-mass model and multiple parallel joint model are established to explore the attenuation of stress waves and damage effect of multiple joint rock mass, it is concluded that the larger the angle, the smaller is the particle peak velocity and amplitude attenuation, and as the number of stress waves passing through the joints increases, the amplitude gradually decreases and the high-frequency amplitude decreases more significantly than the low-frequency amplitude. The research conclusions of this paper further reveal the damage mechanism induced by a blasting stress wave on jointed rock masses and the law of stress wave propagation and attenuation.

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“…The monitoring method quantitatively studied the evolution characteristics of the strain field and the phenomenon of strain localization during the failure process of the intact marble specimen. Ke Zhang et al [12] measured the evolution characteristics of the strain field in the fracture process of fractured sandstone, introduced the standard deviation of the strain field and the differentiation rate index, and put forward the precursor information of the fractured rock mass tension and shear crack initiation.…”

Section: Introductionmentioning

confidence: 99%

Multi-Source Information Monitoring Test of Fractured Rock Mass Destruction Characteristics and Sensitivity Analysis of Precursor Phenomena

et al. 2022

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The accuracy of the monitoring information is particularly important for exploring fractured rock mass deformation and failure mechanisms and precursor characteristics. Appropriate monitoring methods can not only timely and effectively reflect the failure laws of fractured rock masses but also play an early warning role. To explore more reasonable monitoring methods, uniaxial compression experiments and real-time non-destructive monitoring on prefabricated fractured rock specimens through DIC, AE, and IRT were conducted; the strain field, temperature field, ringing frequency, standard deviation, etc. were analyzed; and correlation between the three methods in the information of audience was explored. The results show the following. (1) The failure evolution process of fractured rock mass can be divided into four stages. DIC can detect the initiation and propagation of cracks near the fractures of the specimen at the earliest stages. (2) The order of occurrence of precursor phenomena in multi-source monitoring information is different, which is vertical strain field > shear strain field > horizontal strain field > temperature field > ringing times. (3) The dispersion degree of standard deviation of each field is obviously different; the infrared temperature field is greater, but the strain field and temperature field show the same trend. (4) There are obvious precursors before the specimen is on the verge of instability; acoustic emission detected two consecutive increases in the cumulative number of ringing before destruction, which means the most obvious precursors. The research results can provide a theoretical basis for the precursory information capture and damage early warning of the fractured rock mass destruction process.

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Strain Field Evolution Characteristics of Free Surface during Crater Blasting in Sandstone under High Stress

Cited by 12 publications

References 29 publications

Experimental Study on the Effects of In Situ Stress on the Initiation and Propagation of Cracks during Hard Rock Blasting

Experimental Study on the Effects of In Situ Stress on the Initiation and Propagation of Cracks during Hard Rock Blasting

Damage Mechanism and Wave Attenuation Induced by Blasting in Jointed Rock

Multi-Source Information Monitoring Test of Fractured Rock Mass Destruction Characteristics and Sensitivity Analysis of Precursor Phenomena

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