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Theory and test of underground explosions:Coupling rule between cratering and ground shock

Underground Space 2024年第4期17卷 146-160页

作者： Wei Guo Jie Li Benjun Shi Tianhan Xu Xiaohui Xu Gan Li Jie Shi State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact Army Engineering University of PLANanjing 210007China

Calculating the parameters of the ground shock induced by an underground explosion is a complex energy coupling *** is difficult to establish a unified ground shock coupling law from limited test *** paper summarizes the research results obtained at home and abroad and systematically analyzes the coupling mechanism of craters formed by an underground explosion and the ground *** differences between the concepts of"closed-explosion critical depth"and"equivalent closed-explosion critical depth"are clearly *** spreading of the ground shock energy is attributed to the explosive expansion of the air cavity,revealing a linear relationship between the volume of the cavity region(or the volume of the crack region)and the ground shock energy associated with the underground *** proportionality factor is related to the mechanical properties of the medium and is independent of the magnitude of the explosion *** on this,a theoretical calculation formula and conversion method for the ground shock coupling coefficient were *** tests were conducted in clay and Plexiglass under varying burial *** test results were consistent with the theoretically calculated *** study provides a theoretical basis for the design of explosion-resistant structures in underground engineering.

关键词： Underground explosion Ground shock coupling Coupling coefficient Equivalent closed explosion Experimental study

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Non-dimensional analysis on blast wave propagation in foam concrete:Minimum thickness to avoid stress enhancement

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Defence Technology（防务技术） 2024年第6期36卷 30-46页

作者： Ya Yang Xiangzhen Kong Qin Fang State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007JiangsuChina

Foam concrete is a prospective material in defense engineering to protect structures due to its high energy absorption capability resulted from the long plateau ***,stress enhancement rather than stress mitigation may happen when foam concrete is used as sacrificial claddings placed in the path of an incoming blast *** investigate this interesting phenomenon,a one-dimensional difference model for blast wave propagation in foam concrete is firstly proposed and numerically solved by improving the second-order Godunov *** difference model and numerical algorithm are validated against experimental results including both the stress mitigation and the stress *** difference model is then used to numerically analyze the blast wave propagation and deformation of material in which the effects of blast loads,stress-strain relation and length of foam concrete are *** particular,the concept of minimum thickness of foam concrete to avoid stress enhancement is ***,non-dimensional analysis on the minimum thickness is conducted and an empirical formula is proposed by curve-fitting the numerical data,which can provide a reference for the application of foam concrete in defense engineering.

关键词： Foam concrete Blast wave propagation Non-dimensional analysis Stress enhancement

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Effect of diagenetic variation on the static and dynamic mechanical behavior of coral reef limestone

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International Journal of Mining Science and Technology 2024年第7期34卷 893-908页

作者： Linjian Ma Jiajun Deng Mingyang Wang Jianping Wang Bin Fang Jiawen Wu State Key Laboratory of Explosion&Impact and Disaster Prevention&Mitigation Army Engineering University of PLANanjing 210007China Naval Research Institute Beijing 100070China

Coral reef limestone at different depositional depths and facies differ remarkably on the textural and mineralogical characteristics,owing to the complex sedimentary *** explore the effects of pore structure and mineral composition associated with diagenetic variation on the mechanical behavior of reef limestone,a series of quasi-static and dynamic compression tests along with microscopic examinations were performed on the reef limestone at shallow and deep burial *** is revealed that the shallow reef limestone(SRL)is classified as a porous aragonite-type carbonate rock with high porosity(55.3±3.2)%and pore *** comparison,the deep reef limestone(DRL)is mainly composed of dense calcite-type calcium carbonate with low porosity(4.9±1.6)%and pore *** DRL strengthened and stiffened by the tight grain framework consistently displays much higher values of the dynamic compressive strength,elastic modulus,brittleness index,and specific energy absorption than those of the *** gap between two types of limestone further increases with an increase in strain *** appears that the failure pattern of SRL is dominated by the inherent defects like weak bonding interfaces and growth lines,revealed by the intricate fracturing network and mixed ***,although the preexisting megapores in DRL may affect the crack propagation on pore tips to a certain distance,it hardly alters the axial splitting failure of DRL under *** stress wave propagation and attenuation in SRL is primarily controlled by the reflection and diffusion caused by plenty mesopores,as well as an energy dissipation in layer-wise pore collapse and adjacent grain crushing,while the stress wave in DRL is highly hinged on the insulation and diffraction induced by the isolated *** process is accompanied by the energy dissipation behavior of inelastic deformation resulted from the pore-emanated microcracking.

关键词： Reef limestone Dynamic behavior Mineral composition Pore structure Wave propagation Energy dissipation

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Experimental study on the irreversible displacement evolution and energy dissipation characteristics of disturbance instability of regular joints

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Deep Underground Science and Engineering 2023年第1期2卷 20-36页

作者： Jianan Yang Pengxian Fan Mingyang Wang Jie Li Lu Dong State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact Army Engineering University of PLANanjingChina

To investigate the disturbance-induced shear instability mechanism of structural catastrophe in the deep rock mass,MTS 815 material testing machine was used to carry out quasi-static loading tests and disturbance shear tests on symmetrical regular dentate joints of two materials at three undulation angles under specific initial static stress,disturbance frequency,and peak *** test results indicate that:(i)the total ultimate instability displacement is only related to the intrinsic properties of the joints but not to the initial static stress and disturbance parameters;(ii)the cumulative irreversible displacement required for the disturbance instability conforms to the logistic inverse function relationship with the number of disturbances,displaying the variation trend of“rapid increase in the front,stable in the middle,and sudden increase in the rear”;(iii)the accumulation of plastic deformation energy is consistent with the evolution law of irreversible displacement of joints and the overall proportion of hysteretic energy is not large;(iv)the dissipated energy required for the instability of each group of joints is basically the same under various disturbance conditions,and this energy is mainly controlled by the initial shear stress and has no connection with the disturbance *** stability of the total disturbance deformation and the disturbance energy law of the joints revealed in the tests provide data support for reasonably determining the disturbance instability criterion of joints.

关键词： coupled static-dynamic loading instability energy irreversible displacement joints stability

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Assessment of ultra-high tensile-strength polyurea for underground roof fall support: Insights from work of adhesion

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Geohazard Mechanics 2025年第1期3卷 28-41页

作者： Hou, Bobin Xing, Haozhe Yue, Songlin Zhang, Zhongwei Qiu, Yanqyu Wang, Mingyang State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact Army Engineering University of PLA Nanjing 210007 China

Underground mining often faces the threat of roof fall disaster. As a new type of supporting technology, thin spray-on liner (TSL) has gained an increasing attention in underground mining due to its notable tensile strength, elongation capability, and bond strength with rock surfaces. To evaluate the roof fall support performance of TSL based on a novel ultra-high tensile-strength polyurea, tensile adhesive strength between polyurea and rock substrates were tested under different thicknesses, curing conditions, substrate strength, primer and coating method. Meanwhile, this study proposed a new testing method for dynamic tensile adhesive strength between TSL material and rock. The results indicate that the adhesive strength is inversely proportional to the square root of the coating thickness. When the curing time exceeds 7 days, the adhesive strength remains relatively constant. As the curing temperature/humidity increases, the adhesive strength gradually increases. But when the humidity exceeds 70%, the adhesive strength significantly decreases. Since the soft rock has the tensile strength that even lower than the adhesive strength, polyurea-based TSL is more suitable for harder rock from the perspective of adhesive strength. The application of a primer significantly improves the tensile adhesive strength more than 10 MPa. When the coating thickness is less than 2 mm, the adhesive strength of sprayed polyurea is significantly higher than that of brushed polyurea. Dynamic adhesive strength exhibits an insignificant loading rate effect with DIF ranging from 1.05 to 1.34. Based on the adhesion results, a supporting model was established, assessing the capability of supporting roof loose rock mass by polyurea-based TSL. © 2025 The Author(s)

关键词： Adhesion strength Polyurea Rock support Roof fall Thin spray-on liner

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Experimental and numerical simulation of the attenuation effect of blast shock waves in tunnels at different altitudes

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Defence Technology(防务技术) 2025年第1期43卷 120-141页

作者： Changjiang Liu Hujun Li Zhen Wang Yong He Guokai Zhang Mingyang Wang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact People's Liberation Army Engineering UniversityNanjing 210014China

Traffic engineering such as tunnels in various altitudinal gradient zone are at risk of accidental explosion,which can damage personnel and *** prediction of the distribution pattern of explosive loads and shock wave propagation process in semi-enclosed structures at various altitude environment is key research focus in the fields of explosion shock and fluid *** effect of altitude on the propagation of shock waves in tunnels was investigated by conducting explosion test and numerical *** on the experimental and numerical simulation results,a prediction model for the attenuation of the peak overpressure of tunnel shock waves at different altitudes was *** results showed that the peak overpressure decreased at the same measurement points in the tunnel entrance under the high altitude *** contrast,an increase in altitude accelerated the propagation speed of the shock wave in the *** average error between the peak shock wave overpressure obtained using the overpressure prediction formula and the measured test data was less than15%,the average error between the propagation velocity of shock waves predicted values and the test data is less than 10%.The method can effectively predict the overpressure attenuation of blast wave in tunnel at various altitudes.

关键词： Shock wave propagation Tunnel Altitude effect Peak overpressure Shock waves velocity Engineering safety

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Layered metastructure containing freely-designed local resonators for wave attenuation

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Defence Technology（防务技术） 2024年第2期32卷 23-31页

作者： Yu Li Huguang He Jiang Feng Hailong Chen Fengnian Jin Hualin Fan State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China Rocket Force University of Engineering Xi'an 710025China Henan International Joint Laboratory of Dynamics of Impact and Disaster of Engineering Structures Department of Civil EngineeringNanyang Institute of TechnologyNanyang 473004China Guangxi Key Laboratory of Disaster Prevention and Engineering Safety and Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationCollege of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China Research Center of Lightweight Structures and Intelligent Manufacturing State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China

Combining periodic layered structure with three-dimensional cylindrical local resonators,a hybrid metastructure with improved wave isolation ability was designed and investigated through theoretical and numerical *** metastructure is composed of periodic rubber layers and concrete layers embedded with three-dimensional resonators,which can be freely designed with multi local resonant frequencies to attenuate vibrations at required frequencies and widen the attenuation *** metastructure can also effectively attenuate seismic *** with layered rubber-based structures,the metastructure has more excellent wave attenuation effects with greater attenuation and wider bandgap.

关键词： Layered metastructure Local resonator Wave attenuation

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Quantitative characterization of cellular morphology of turbulent hydrogen-air spherically expanding flames

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International Journal of Hydrogen Energy 2025年 142卷 548-556页

作者： Zhao, Haoran Bao, Shikai Shi, Zhenghao Quan, Minbo Tian, Fuchao Yuan, Chunmiao Li, Gang Fire & Explosion Protection Laboratory Northeastern University Shenyang110819 China State Key Laboratory of Coal Mine Disaster Prevention and Control China Coal Technology and Engineering Group Shenyang Research Institute Shenfu Demonstration Zone 113122 China

In the present study, the morphology evolution of turbulent hydrogen expanding flames is comprehensively investigated. A quantitative characterization method of turbulent flame cellularity is proposed based on machine leaning. A series of experimental data (cell size, cell number, onset of cell division, and fractal excess) of turbulent flame morphology are obtained, and the effects of turbulent intensity, equivalence ratio and pressure are analyzed. The results indicate that the morphology evolution of turbulent expanding flames can be divided into self-similar crack stage, cell division stage, and cell saturation stage. The onset of cell division and the fractal excess are evidently promoted by turbulent disturbance, and the saturated cell size is mainly controlled by Kolmogorov length scale. Based on above experimental data, two empirical models of onset and fractal excess are correlated as Pecr = 49.4·(u’/SL)−0.56 and dt = 0.35·(u’/SL)0.24 respectively. All above results imply that the mechanism of turbulent flame cellularity is essentially different from that of laminar flames. The cellular morphology of turbulent flames is dominated by turbulent disturbance, and the flame intrinsic instability plays a secondary role. © 2025 Hydrogen Energy Publications LLC

关键词： Premixed flames

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High-velocity projectile penetration test and theoretical calculation of pseudo fluid penetration of calcareous sand

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Defence Technology（防务技术） 2024年第12期42卷 105-115页

作者： Wei Guo Yanyu Qiu Mingyang Wang State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

To explore the penetration resistance of calcareous sand media,penetration tests have been conducted in the velocity range of 200-1000 m/s using conical-nosed projectiles with a diameter of 14.5 ***,a pseudo fluid penetration model applicable to the penetration of rigid projectiles in sand media is established according to the approximate flow of compacted sand in the adjacent zone of *** correlation between the impedance function of projectile-target interaction and the internal friction features of pseudo fluid is clarified,and the effects of sand density,cone angle of nose-shaped projectile,and dynamic hardness on the penetration depth are *** results verify the feasibility,wide applicability,and much lower error(with respect to the experimental data)of the proposed model as compared to the Slepyan hydrodynamic model.

关键词： Calcareous sand Penetration tests Slepyan hydrodynamic model Internal friction penetration model

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Numerical Simulation of Tunnel Gas explosion and Structural Damage Analysis Based on ANSYS/LS-DYNA 24

Numerical Simulation of Tunnel Gas Explosion and Structural ...

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5th International Conference on Computer Science and Management Technology, ICCSMT 2024

作者： Deng, Zhaoyu State Key Laboratory of Coal Mine Disaster Prevention and Control Chongqing China

ISBN: (纸本)9798400709999

To investigate the damage and destruction caused by gas explosion shock waves to the wall structures of a roadway, the physical and mathematical models of gas explosion in roadways were established using ANSYS/LS-DYNA to conduct a numerical simulation study on the destructive characteristics of gas explosion shock waves in excavation roadways. The results indicate that the Excess pressure measurements are higher at the edge and center positions of the roadway wall, resulting in relatively more severe damage to the wall. The shock waves also exhibit reflection and superposition on the axial wall of the roadway, leading to fluctuations in the overall Excess pressure peak. After the gas explosion, the shock waves propagate towards the opening direction, with the maximum load applied to the wall in the gas zone, gradually spreading to the air zone. As the energy of the explosion shock waves decays, the stress continues to be applied to the wall structure, with concentrated pressure exerting static damage to the wall structure. Ultimately, the damage exceeds the structure's bearing capacity, resulting in the instability and destruction of the roadway. These research findings provide theoretical references for optimizing the design of roadway structures. © 2024 Copyright held by the owner/author(s). Publication rights licensed to ACM.

关键词： Walls (structural partitions)

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