Explosion‐Induced Stress Wave Propagation in Interacting Fault System: Numerical Modeling and Implications for Chaoyang Coal Mine

Feng, Xiaoting; Zhang, Qiming; Ali, Muhammad

doi:10.1155/2019/5856080

Cited by 15 publications

(4 citation statements)

References 34 publications

(33 reference statements)

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“…When the stress wave passes through the fault, part of the energy of the stress wave will be absorbed by the fault, resulting in obvious attenuation of dynamic response, and the angle of the fault has a great impact on this phenomenon 15 . During the propagation of stress wave, due to the existence of fault, the reflection effect of stress wave will also occur 16 , which intensifies the damage of rock mass in the area between fault and fault 17 , 18 . The structure of weak interlayer is similar to that of fault.…”

Section: Introductionmentioning

confidence: 99%

Study on blasting characteristics of rock mass with weak interlayer based on energy field

Cui

Xie

Qiao

et al. 2022

Sci Rep

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In order to explore the influence of weak interlayer on blasting characteristics in natural rock mass, by using the particle flow code (PFC2D), a single hole blasting numerical model of hard rock with soft interlayer is established. The blasting experiments at different positions and thicknesses of weak interlayer are carried out. Then an in-depth analysis from the perspectives of crack effect, stress field and energy field is made. Results showed that: (i) When the explosion is initiated outside the weak interlayer, if the interlayer is located within about twice the radius of the crushing area, the closer the interlayer is to the blast hole, the higher the damage degree of the rock mass around the blast hole. And the number of cracks will increase by about 1–2% when the distance between the weak interlayer and the blast hole decreases by 0.5 m. (ii) When detonating outside the weak interlayer, if the interlayer is within about 4 times radius of the crushing area, the hard rock on both sides of the weak interlayer will in a high stress state. Under the same case, the peak kinetic energy and peak friction energy will increase by about 23 and 13%, respectively, and the peak strain energy will increase by about 218 kJ for every 0.1 m increase in the thickness of the weak interlayer.

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Section: Introductionmentioning

confidence: 99%

Study on blasting characteristics of rock mass with weak interlayer based on energy field

Cui

Xie

Qiao

et al. 2022

Sci Rep

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show abstract

“…However, few studies consider the coupling effect of joint characteristics and stress field. The study shows that the joints under confining pressure can attenuate to a specific extent corresponding to the force waves [20,21]. As a result, the author considers the qualities of the filling joint material under the joint influence conditions and the coupling impact of various confining pressure levels.…”

Section: Introductionmentioning

confidence: 99%

Study on Stress Evolution and Crushing Behavior of Jointed Rock Mass under Confining Pressure and Joint Materials

Wang

Qihu

Fuli³

et al. 2023

Geofluids

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To study the effects of confining pressure and joint material properties on stress evolution and fracture behavior of jointed rock mass under SHPB impact load, the numerical software LS-DYNA and the indoor SHPB impact system are used to carry out experimental research on intact rock mass and jointed rock mass. The peak stress, reflection and transmission coefficient, and specimen failure state of rock specimens under different schemes are obtained. The effects of confining pressure level and joint material properties on the propagation and attenuation law of explosive stress waves are expounded. The test results show that when the confining pressure is within a specific range, the impact resistance of the limestone specimen can be increased, and the more difficult it is to be destroyed. Moreover, if the confining pressure continues to increase after rising to the peak value, the impact resistance of rock specimens will decline. In that case, the impact resistance of the specimen will decrease—the dynamic strength of jointed rock mass changes with a change in joint material. The dynamic strength of cement jointed rock is the highest, that of gypsum jointed rock is the second, and that of epoxy resin jointed rock is the lowest. The impact damage resistance of the jointed rock has the same law as the above.

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“…The average deformation of the advanced headings in the working face has been controlled [20]. Feng et al [21] used COMSOL to study the influence of faults on stress wave propagation and indicated that the elastic modulus, density, and Poisson's ratio of the fault surrounding rock significantly influence stress wave attenuation. He et al [22] studied seismic wave propagation due to a remote seismic source and found that the seismic wave attenuates more rapidly in weaker rock formations.…”

Section: Introductionmentioning

confidence: 99%

Seismic Mitigation Effect of Overlying Weakening Strata in Underground Coal Mines

et al. 2023

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Artificial construction of a weakening zone over the roadway is an essential method for preventing coal bursts and rock bursts caused by strong mining tremors. However, concerning the seismic absorption and load reduction capabilities of an artificial structural weakening zone, the degree of rock mass damage to the roadway under weakening zone protection remains unclear. This study employed principles of elasticity and UDEC (Universal Distinct Element Code) to explore the seismic attenuation and load reduction capabilities of the weakening zone. The results indicate that the absorbing ability of the weakening zone increases exponentially with its weakening coefficient. Under the same dynamic load disturbance, when the weakening coefficient rises from 0.00 to 0.99, the sidewall displacement from the elastic wave source side changes from 0.400 m to 0.228 m. The total number of cracks in the roadway-surrounding rock, and the ranges of overstressed zones decreased linearly. The critical threshold of the roadway resisting the mining tremor disturbance increased. In particular, when the mining tremor is located directly above the roadway, the initial deformation of the roof is the largest, and the cumulative deformation of the rib is greater than the roof. By creating a weakening zone with a coefficient exceeding 0.95, the roadway remains unaffected by the 20 MPa dynamic loading. The study provides a theoretical basis for controlling coal burst that is triggered by mining tremors.

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Explosion‐Induced Stress Wave Propagation in Interacting Fault System: Numerical Modeling and Implications for Chaoyang Coal Mine

Cited by 15 publications

References 34 publications

Study on blasting characteristics of rock mass with weak interlayer based on energy field

Study on blasting characteristics of rock mass with weak interlayer based on energy field

Study on Stress Evolution and Crushing Behavior of Jointed Rock Mass under Confining Pressure and Joint Materials

Seismic Mitigation Effect of Overlying Weakening Strata in Underground Coal Mines

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