Crack Propagation Law Affected by Natural Fracture and Water Jet Slot under Blast Loading

Su, Dongxu; Kang, Yinhu; Yan, Fei; Zheng, Dandan; Wang, X.; Wei, Mingyao

doi:10.1134/s0010508218060151

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…Explosive. Consider the characteristics of high temperature and high pressure of explosive explosion, MAT_HIGH_EXPLOSIVE_BURN was chosen as the explosive model, and the Jones-Wilkens-Lee (JWL) equation of state (EOS) was used to model the pressure released by the chemical energy in the engineering calculations [42], it can be written in formula (11). e following parameters were used: explosive density ρ e of 1.93 × 10 3 kg/m 3 , detonation velocity v d of 9.93 × 10 3 m/s, output pressure p cut of 3.37 × 10 4 MPa, and the input parameters were A of 3.7 × 10 5 MPa, B of 7.43 × 10 3 MPa, R 1 of 4.15, R 2 of 0.95, and ω of 0.30.…”

Section: Simulation Materials Modelmentioning

confidence: 99%

“…Derived wing cracks are generated at the tip of natural fracture due to the stress concentration effect of explosion stress wave, and the length of derived wing cracks for case SN V -1 is slightly larger than the length of derived wing cracks for case SN I -1 and case SN I -3. at is because the existence of water jet slot causes explosion stress wave concentrate in this direction of water jet slot [11]. If the distance between blast hole and natural fracture, the derived wing cracks will no longer occur.…”

Section: Experiments On Propagation Law Of Blast-induced Crack Under ...mentioning

confidence: 99%

“…Generally speaking, the more uniform the rock is, the more favorable it is to control the propagation of blastinduced crack. However, rock mass contains a large number of joints and ssures, which has a great in uence on the propagation of blast-induced crack [10][11][12]. erefore, it is of great signi cance to analyze the e ect of natural fracture on the blast-induced crack propagation.…”

Section: Introductionmentioning

confidence: 99%

“…However, for the water jet slotted, guided, controlled blasting technology, the existence of jet slots will affect the propagation law of blast-induced cracks [6,7], so it is necessary to study the combined effect mechanism of natural fracture and water jet slot on the propagation of blast-induced crack. Based on this, an attempt was made in this article to study the propagation law for blast-induced crack affected by inclined natural fracture and water jet slot [11]. e stress wave theory was applied to characterize the explosion stress wave transmission law.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Combined Effect of Inclined Natural Fracture and Water Jet Slot on the Blast-Induced Crack Propagation Law

Jia

Zhu

et al. 2022

Shock and Vibration

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For the purpose of uncovering the influence law on the explosion stress wave transmission and blast-induced crack propagation by inclined natural fracture and water jet slot, the influential mechanism for the transmission law of explosion stress wave due to inclined natural fracture was analyzed based on stress wave theory in this article. Next, the evolution law of explosion stress wave and blast-induced crack propagation affected by inclined natural fracture and water jet slot were simulated by ANSYS/LS-DYNA, and an experiment was conducted to understand the crack propagation law under explosion shock wave loading. The results indicate that the existence of inclined natural fracture will affect the “guiding effect” of water jet slot on blast-induced crack propagation by changing the propagation path and mechanical properties of the explosion stress wave. When the distance between inclined natural fracture and blast hole is too small, the water jet slot cannot play a guiding role in propagation process of blast-induced main crack. With the increase of the distance, the propagation direction of blast-induced crack is affected by both inclined natural fracture and water jet slot. When the distance increases further and exceeds a certain value, inclined natural fracture cannot affect the guiding effect of water jet slot in propagation process of blast-induced main crack.

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Section: Simulation Materials Modelmentioning

confidence: 99%

Section: Experiments On Propagation Law Of Blast-induced Crack Under ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on the Combined Effect of Inclined Natural Fracture and Water Jet Slot on the Blast-Induced Crack Propagation Law

Jia

Zhu

et al. 2022

Shock and Vibration

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show abstract

“…Therefore, the rock breaking process by high-pressure water jet is very complex [12]. At present, there are mainly five theories [13,14,15]: ① quasi-static elastic crushing theory [16,17]; ② stress wave theory [18]; ③ cavitation rock breaking theory [19,20,21,22]; ④ crack propagation theory [23,24,25]; and ⑤ seepage stress and damage fracture theory [26]. Natural gas hydrate deposit is a kind of weakly cemented mineral, and its mechanical properties is significantly different from rock.…”

Section: Introductionmentioning

confidence: 99%

Structure and arrangement optimization of non-diagenetic gas hydrate jet crushing nozzles based on CFD simulation

Fang

Zhong

et al. 2022

J. Eng. Appl. Sci.

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To optimize the optimal nozzle structure and multiple nozzle arrangement for hydrate jet crushing and to promote the development of solid fluidization extraction technology for shallow unconformity hydrate in China’s oceans, the submerged jet flow field of six commonly used nozzle structures in the downhole in-situ jet crushing process was analyzed on the basis of the solid fluidization extraction process in double-layer pipes, and the effect of the jet hole arrangement on the overflow performance of hydrate slurry in the outer annulus of double-layer pipes was also investigated. It was demonstrated that tapered straight nozzles were preferably selected as the nozzle type for hydrate solid fluidization mining process based on jet core stage length, jet energy dissipation rate, and jet fluid axial velocity. In the meantime, the optimum arrangement of the nozzles was preferred on the basis of the annular pressure drop and the flow resistance coefficient, with the number of single circle not higher than 3 and the axial spacing of the nozzles not lower than 50 mm. This study can provide a theoretical basis for nozzle selection and tool design for the solid fluidization jet crushing process of marine unconformable hydrates.

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Study on blast‐induced cracks penetration characteristics of double water jet slotted boreholes

Su,

Chen,

Chen

et al. 2024

Energy Science & Engineering

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Studying the penetration characteristics of blast‐induced cracks during double water jet slotted boreholes blasting is theoretically and practically significant since it acts both by the “superposition effect” of explosion‐induced stress waves and the “guiding effect” of water jet slots. A combination of experimental testing and numerical simulation was adopted to investigate the transmission law of explosion‐induced stress waves and the propagation law of blast‐induced cracks first. Then the penetration characteristics of blast‐induced cracks was analyzed according to rock blasting theory and rock fracture mechanics theory. The results indicate that the rock between the two boreholes is mainly subjected to a tensile failure mode due to the combined effect of the “superposition effect” of explosion‐induced stress wave and the “guiding effect” of water jet slot during double water jet slotted boreholes blasting. The hole spacing significantly affects the penetration mode of blast‐induced cracks during double water jet slotted boreholes blasting, and unless it reaches a certain value, a single flat through‐crack will form between two slotted boreholes. In addition, when the blast‐induced cracks successfully penetrate each other, the hole spacing of double water jet slotted boreholes increases by 33.3% compared with that of double circular boreholes under the same conditions. The research results can provide guidance for the application of directional controlled blasting technology with water jet assistance.

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Crack Propagation Law Affected by Natural Fracture and Water Jet Slot under Blast Loading

Cited by 6 publications

References 15 publications

Study on the Combined Effect of Inclined Natural Fracture and Water Jet Slot on the Blast-Induced Crack Propagation Law

Study on the Combined Effect of Inclined Natural Fracture and Water Jet Slot on the Blast-Induced Crack Propagation Law

Structure and arrangement optimization of non-diagenetic gas hydrate jet crushing nozzles based on CFD simulation

Study on blast‐induced cracks penetration characteristics of double water jet slotted boreholes

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