A new Method for Measuring Mode-I Dynamic Fracture Toughness of Rock under Blasting Loads

Zhu, Zheming; Xu, Wenfei; Feng, Ruoqi

doi:10.1007/s40799-016-0093-x

Cited by 19 publications

(2 citation statements)

References 22 publications

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“…Yi et al 22 studied influences of in-situ stress on rock breakage in the blasting process and concluded that crack propagation near the blastholes is mainly controlled by blast loads while in-situ stress mainly affects the direction of propagation of distant cracks. By conducting tests and simulation, Zhu et al 23 – 26 measured the crack initiation toughness and crack propagation in rocks under in-situ stress and described the fracture behaviors and characteristics of rocks under blast loads. Li et al 27 investigated the evolution of seepage in fractured rock masses under mining-induced stress.…”

Section: Introductionmentioning

confidence: 99%

Shaping characteristics of excavation contours in sequential controlled fracture blasting of rock-anchored beams in Shuangjiangkou underground powerhouse

Chen,

Huang,

Zhang

et al. 2023

Sci Rep

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Influences of high in-situ stress generally need to be considered when excavating deep underground caverns. The dynamic fracture behaviors of rocks under blast loads were investigated by using the rock-anchored beam excavation in underground powerhouses of Shuangjiangkou Hydropower Station in Sichuan Province, China as the engineering background. To solve the problems of the poor blasting breakage effect of rocks and the difficulty in protecting surrounding rocks during excavation, mechanical properties of granite under static and dynamic loads were investigated and the sequential controlled fracture blasting (SCFB) method was adopted during in-situ tests. Based on the Riedel-Hiermaier-Thoma constitutive model and the strength criterion, software LS-DYNA was employed to simulate the dynamic propagation of blasting-induced cracks. The contour shaping effect obtained via numerical simulation is generally consistent with the test results. The results show that SCFB can to some extent control the direction of crack initiation and rock fracture behavior of the blasthole wall cracks and the spacing of successive bursting holes is about 10 times the diameter of the blastholes when the cracks between the blastholes are shaped the best effect. Moreover, the magnitude and direction of principal in-situ stress can both affect the propagation path and length of blasting-induced cracks. The results of the research on the excavation and construction of deeply buried underground caverns have a certain reference value.

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Section: Introductionmentioning

confidence: 99%

Shaping characteristics of excavation contours in sequential controlled fracture blasting of rock-anchored beams in Shuangjiangkou underground powerhouse

Chen,

Huang,

Zhang

et al. 2023

Sci Rep

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“…Liu et al [14] studied the dynamic fracture toughness and other fracture parameters of type I crack under the explosive load and pointed out that there was an in ection point on the propagation path and the obvious crack arrest at the in ection point. For rock dynamic fracture toughness of mode I crack under blasting loads, Zhu et al [15] put forward a new measuring method. At the same time, in order to calculate the displacements near the crack tip, the 1/4 node element from ANSYS code is used.…”

Section: Introductionmentioning

confidence: 99%

Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens

Liu

Zhu

Liu

et al. 2019

Shock and Vibration

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Radial cracks may exist around tunnel edge, and these cracks may propagate and weaken tunnel stability under nearby blasting operations. In order to study the blast-induced fracture behavior of radial cracks emanating from a tunnel spandrel, a tunnel model containing a spandrel crack (TMCSC) with different inclination angles was proposed in this paper. Crack propagation gauges (CPGs) and strain gauges were used in the experiments to measure crack initiation moment and propagation time. Finite difference models were established by using AUTODYN code to simulate crack propagation behavior and propagation path. ABAQUS code was used to calculate dynamic stress intensity factors (SIFs). The results show that (1) crack inclination angles affect crack initiation angles and crack propagation lengths significantly; (2) critical SIFs of both mode I and mode II decrease gradually with the increase of the crack propagation speed; (3) the dynamic energy release rates vary during crack propagation; and (4) there are “crack arrest points” on the crack propagation paths in which the crack propagation speed is very small.

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Mixed-mode I/II dynamic fracture behavior in PMMA driven by stress waves

et al. 2023

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A new Method for Measuring Mode-I Dynamic Fracture Toughness of Rock under Blasting Loads

Cited by 19 publications

References 22 publications

Shaping characteristics of excavation contours in sequential controlled fracture blasting of rock-anchored beams in Shuangjiangkou underground powerhouse

Shaping characteristics of excavation contours in sequential controlled fracture blasting of rock-anchored beams in Shuangjiangkou underground powerhouse

Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens

Mixed-mode I/II dynamic fracture behavior in PMMA driven by stress waves

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