Experimental study of crack propagation and failure around a horseshoe tunnel during nearby blasting

He, Chenglong; Chen, Dayong; Xiao, Jianguang; Lu, Lin; Guo, Zhangxia

doi:10.1016/j.ijrmms.2021.104628

Cited by 20 publications

(7 citation statements)

References 22 publications

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“…Substituting the above boundary conditions into Equation (16) to Equation (25), the matrix expression related to the coefficients A n1 , A n2 , A n3 , B n1 , B n2, and B n3 can be expressed as…”

Section: Boundary Conditions and Dynamic Stress Concentrationmentioning

confidence: 99%

“…It was discovered that the surrounding rock of the underground roadway primarily showed radial fracture under the action of stress wave, and the failure modes were greatly influenced by the incoming direction of stress waves, the stress level of the surrounding rock, and so on. [24][25][26] Obviously, the mentioned research works have made a great contribution to disclosing the deformation characteristics and failure mechanisms of roadways under dynamic disturbances, providing some important theoretical basis and practical experiences for dynamic disaster prevention and controlling, as well as the support of underground roadways. However, these studies paid more attention to the deformation and failure characteristics of surrounding rock based on whether the surrounding rock was in an intact or elastic state, hardly ever taking into account the influence of the surrounding rock's excavation damaged zone (EDZ) on the dynamic mechanical response of roadway after excavation.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, field studies and physical model tests were carried out with an emphasis on the deformation and failure of underground roadways. It was discovered that the surrounding rock of the underground roadway primarily showed radial fracture under the action of stress wave, and the failure modes were greatly influenced by the incoming direction of stress waves, the stress level of the surrounding rock, and so on 24–26 . Obviously, the mentioned research works have made a great contribution to disclosing the deformation characteristics and failure mechanisms of roadways under dynamic disturbances, providing some important theoretical basis and practical experiences for dynamic disaster prevention and controlling, as well as the support of underground roadways.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of dynamic stress distribution around a circular damaged roadway under transient disturbance

Zhao,

Tao,

2023

Num Anal Meth Geomechanics

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Excavation damaged zone (EDZ) widely exists in the surrounding rock of underground roadway due to blasting excavation, which can further change the surrounding rock property and deteriorate the stability of the roadway. In the presented research, a damaged roadway model was developed to investigate the dynamic stress concentration factor (DSCF) distribution around the damaged roadway under a transient plane P wave. The influencing factors on DSCF distribution were discussed, including the shear modulus (μe/μd) of the intact surrounding rock to that of the damaged surrounding rock, the thickness of EDZ (Rd/R0), and the wavelength of the incident stress wave. Results indicated that the damaged surrounding rock around the roadway belongs to stress‐relaxed zones, and the existence of EDZ can reduce the overall DSCF of surrounding rock. As the ratio of μe/μd is increasing, both the maximum compressive and tensile stress concentrations in the damaged zones decrease gradually, which is opposite to that in the intact surrounding rock. A larger EDZ can induce a higher DSCF in the damaged surrounding rock and a smaller DSCF in the intact surrounding rock. As the incident stress wave's wavelength is increasing, the peak value of DSCF grows first before declining, finally followed by a constant value. Furthermore, the maximum compressive and tensile stress concentrations are always found near the surrounding rock that is perpendicular to and along the incoming direction of stress waves, respectively. The stress concentration in both intact and damaged surrounding rock near the incoming side of stress waves is higher than that at the transmitted side.

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Section: Boundary Conditions and Dynamic Stress Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of dynamic stress distribution around a circular damaged roadway under transient disturbance

Zhao,

Tao,

2023

Num Anal Meth Geomechanics

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“…They found that the lateral pressure is an important factor for the range of strain concentration zone around the cavern, and the severity of strain rockburst decreases with increasing lateral pressure. He et al [7] analyzed the dynamic response around a horseshoe-shaped opening under blast loading and pointed out that the loading direction significantly affects the crack propagation around the opening.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Responses and Failure Characteristics of Deep Double U-Shaped Caverns under Disturbing Loads

Liang,

Li,

Liu

2024

Applied Sciences

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The instability of double-cavern structure subjected to dynamic disturbances is a key issue for deep rock engineering. To investigate the dynamic responses of deep double U-shaped caverns, comprehensive analyses are conducted by Particle Flow Code (PFC2D), and the influences of incident directions of stress wave, cavern clearances, and cavern height ratios are discussed. The results indicate that the decreasing cavern clearance aggravates the static stress concentration on the intermediate rock pillar. When the stress wave is horizontally incident, the presence of the incident side cavern reduces peak tangential stress and kinetic energy on the non-incident side cavern; the higher the incident side cavern, the less damage on the non-incident side cavern. A vertically incident stress wave causes more severe damage in the intermediate rock pillar compared to a horizontally incident stress wave; the smaller the cavern clearance, the more violent the rockburst in the intermediate rock pillar. Comparatively, the cavern with a lower height exhibits more severe failure at the adjacent sidewall compared to the cavern with a higher height. This work can provide guidelines for disaster prevention of deep double-cavern structures.

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“…Li et al (2021) used a tunnel-shaped cavity within a rock specimen connected with a crack to study the effect of oblique incidence of blasting stress wave on crack initiation and propagation. He et al (2021) rotated the horseshoe tunnel to study the damage characteristics of a tunnel induced by oblique wave incidence, it is found that stress concentration zones tend to appear at the corners of the tunnel. The stress concentration zone is controlled by both incident and reflected waves, and affects the direction of cracks growth.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response and Failure Analysis of Underground Openings to Oblique Wave Incidence

Wang,

Chen

et al. 2024

Int. J. Geomech.

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In deep underground mine, besides the high static in-situ stress, openings such as stopes, drifts and shafts in underground mine are also frequently subjected to dynamic waves coming from blasting and earthquake. The interactions of these waves with the opening boundaries can be under arbitrary incident angles and thus would induce different damages. In order to investigate the dynamic response of openings under the oblique incidence of blasting load, numerical modelling of wave incidence to a rectangular opening at different incident angles and the associated dynamic failure is carried out under various in situ stress states. The numerical model established by the discrete element code PFC2D is first validated against theoretical results for reflection of oblique wave incidence at free surface at various incident angles. The simulation results showed that the reflected P-wave causes spalling around the opening, and the subsequent reflected SV-wave further promotes the propagation of tensile cracks. Among them, the opening ManuscriptClick here to access/download;Manuscript;Manuscript .docx 2 with vertical wave incidence is the most seriously damaged, whilst wave incidence at 15° and 30°angles results in similar damage degree on the incident side of the opening. The damage of the opening at 45° incident angle is light. With the increase of burial depth, the position of spalling at the incident side gets closer to the sidewall of the opening. When the buried depth is 1200 m, the largest number of cracks around the opening is achieved for wave incidence at 45° angle. This research can improve the understanding of the resulted failures from stress wave incidence to the openings at arbitrary angles and contribute to the design of the opening in deep underground.

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Experimental study of crack propagation and failure around a horseshoe tunnel during nearby blasting

Cited by 20 publications

References 22 publications

Theoretical analysis of dynamic stress distribution around a circular damaged roadway under transient disturbance

Theoretical analysis of dynamic stress distribution around a circular damaged roadway under transient disturbance

Dynamic Responses and Failure Characteristics of Deep Double U-Shaped Caverns under Disturbing Loads

Dynamic Response and Failure Analysis of Underground Openings to Oblique Wave Incidence

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