Jinzheng Bai

China University of Mining and Technology

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Linming Dou

China University of Mining and Technology

Jinrong Cao

China University of Mining and Technology

Xuwei Li

Ministry of Ecology and Environment

Jiliang Kan

Anhui University of Science and Technology

Yanjiang Chai

China University of Mining and Technology

Jiazhuo Li

China University of Geosciences

Kunyou Zhou

Anhui University of Science and Technology

Shikang Song

China Coal Technology and Engineering Group Corp (China)

Zhengyi Wang

Tsinghua University

Wu Cai

China University of Mining and Technology

Cooperative Institutions

China University of Mining and Technology

Harbin Engineering University

Ministry of Education of the People's Republic of China

University of Hong Kong

Chinese Academy of Sciences

Shandong University

UNSW Sydney

Anhui University of Science and Technology

Dalian University of Technology

Qingdao University of Science and Technology

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Mechanism of Coal Bursts Induced by Horizontal Section Mining of Steeply Inclined Coal Seams and Application of Microseismic Multiparameter Monitoring in Early Warning

Advances in Civil Engineering (2020)

Sheng-Chuan Wang Linming Dou Zhengyi Wang Jinzheng Bai Yanjiang Chai

Coal bursts occurring in steeply inclined coal seams (SICSs) are increasingly severe. To solve this problem, a mechanical model for the distribution of static stress on coal‐rock masses along panels and the distribution of dynamic load induced by the breakage of thick and hard roofs with propagation distance was established. The stress characteristics after a superposition of dynamic and static loads on the roof and floor roadways ( R r and R f ) were determined. In addition, precursory information characteristics and index sensitivities of four indices for dynamic loads and the CT index for static loads based on seismic tomography were separately analyzed. The monitoring and warning indices for SICSs and flat seams were compared. The results showed that the static stress of R r was significantly higher than that of R f , which provided a basis for the stress‐triggering coal burst behaviors. Three indices for dynamic loads and seismic tomography results exhibited remarkable precursory information and high sensitivity. However, the performance of lack of shock index is poor. The continuous anomaly and the contradiction of indices at R r and R f can be considered as precursory information for predicting coal bursts.

Microseism

Breakage

10.1155/2020/1048624

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Citations (9)

Resisting impact mechanical analysis of an anchored roadway supporting structure under P-wave loading and its application in rock burst prevention

Arabian Journal of Geosciences (2018)

Zhengyi Wang Linming Dou Guifeng Wang Longfei Feng Kai Kang

Rock burst

Dynamic stress

Dynamic pressure

Dynamic load testing

10.1007/s12517-018-3426-5

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Citations (9)

Effect of initiation pattern on rock damage and blasting seismic under multi-hole blasting

Geomatics Natural Hazards and Risk (2023)

Jiliang Kan Linming Dou Xuwei Li Jiazhuo Li Jinzheng Bai

Formulae display:?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax in order to improve their display. Uncheck the box to turn MathJax off. This feature requires Javascript. Click on a formula to zoom.

10.1080/19475705.2023.2192334

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Citations (3)

Coal burst and mining-induced stress evolution in a deep isolated main entry area – A case study

Engineering Failure Analysis (2022)

Kunyou Zhou Linming Dou Xuwei Li Shikang Song Jinrong Cao

Rock burst

Lead (geology)

10.1016/j.engfailanal.2022.106289

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Citations (32)

Evolution Laws of Stress–Energy and Progressive Damage Mechanisms of Surrounding Rock Induced by Mining Disturbance

Applied Sciences (2023)

Jinzheng Bai Linming Dou Xuwei Li Xiaotao Ma Fangzhou Lu

The rock burst induced by the mutual disturbance of mining and excavation is significantly influenced by high static load stress and external dynamic load disturbance. In this paper, the evolution characteristics and progressive damage mechanism of surrounding rock in the process of mutual disturbance of mining and excavation are systematically studied. The results show that the evolution of surrounding rock stress can be roughly divided into three stages: rapid rise in the early stage, continuous rise and step-like decline in the middle stage, and slow rise in the late stage. In the process of parallel mining, the overlying rock movement above the goaf shows the sequence of horizontal penetration of tiny fissures—fracture intensification transition to stratification—non-coordinated caving of middle–low overlying rock—obvious horizontal cracks in the upper key layer. Only under the quasi-static loading mining action does the upper key layer not reach the breaking condition. The wave side of the heading face which is close to the focal point is affected by the dynamic load disturbance, the acceleration duration is short, and the attenuation is relatively fast, so it is the area prone to the earliest impact failure in the face of mining disturbance. The conclusion is helpful to deepen the understanding of the coal burst mechanism of mutual disturbance of mining and excavation.

Rock burst

10.3390/app13137759

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Citations (3)

Discrimination of Microseismic Events in Coal Mine Using Multifractal Method and Moment Tensor Inversion

Fractal and Fractional (2022)

Jiliang Kan Linming Dou Jiazhuo Li Shikang Song Kunyou Zhou

Discrimination of various microseismic (MS) events induced by blasting and mining in coal mines is significant for the evaluation and forecasting of rock bursts. In this paper, multifractal and moment tensor inversion methods were used to investigate the waveform characteristics and focal mechanisms of different MS events in a more quantitative way. The multifractal spectrum calculation results indicate that the three types of MS waveform have different distribution ranges in the multifractal parameters of ∆α and Δf(α). The results show that the blasting schemes also have a great influence on MS waveform characteristics. Consequently, the multifractal parameters of ∆α and Δf(α) can be used to discriminate different MS events. Further, the focal mechanisms of MS events were calculated by seismic moment tensor inversion. The results show that an explosion is not the dominant mechanism of deep-hole blasting MS events, and the CLVD and DC components account for an important proportion, indicating that some additional processes occur during blasting. Moreover, the coal-rock fracture MS events are characterized by compression implosion or compression/shear implosion mixed focal mechanisms, while the overburden movement MS events are tensile explosion or tensile/shear explosion mixed focal mechanisms. The focal mechanisms and nodal plane parameters have close relationships with the inducing factors and occurrence processes of MS events.

Microseism

Multifractal system

Focal mechanism

10.3390/fractalfract6070361

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Citations (9)

Mechanism of Coal Burst Triggered by Mining-Induced Fault Slip Under High-Stress Conditions: A Case Study

Frontiers in Earth Science (2022)

Jinzheng Bai Linming Dou Jiazhuo Li Kunyou Zhou Jinrong Cao

Coal burst disaster is easily triggered by mining-induced fault unloading instability involving underground engineering. The high-static stress environment caused by complex geological structures increases the difficulty in predicting and alleviating such geological disasters caused by humans. At present, the mechanism of coal burst induced by mining-induced slip fault under high-stress conditions still cannot be reasonably explained. In this study, the burst accidents occurring near mining-induced slip fault under high-stress conditions were carefully combined, and the “time–space–intensity” correlation of excavation, fault, and syncline and anticline structure of the mining areas was summarized. On this basis, the rotation characteristics of the main stress field of the fault surface subjected to mining under high-stress conditions and the evolution law of stress were analyzed. Last, based on the spectrum characteristics of mining-induced tremors, the first motion of the P-wave, and the ratio of Es/Ep, the source mechanism behind mining-induced fault slip under high-stress conditions was revealed. The results demonstrate that the coal burst triggered by the fault slip instability under high-stress conditions is closely related to the excavation disturbance and the fold structure. Mining activities trigger the unloading and activation of the discontinuous structural surface of the fault, the rotation of the stress field, and the release of a large amount of elastic strain energy and cause dynamic disasters such as coal bursts. The research results in this study are helpful to enrich the cognition of the inducing mechanism of fault coal burst.

Rock burst

Stress field

Anticline

10.3389/feart.2022.884974

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Citations (9)

Mechanism of Coal Burst Triggered by Disturbing Mining-Induced Stress: An Experimental Investigation

Applied Sciences (2022)

Jinzheng Bai Linming Dou Xuwei Li Jinrong Cao Kangkang Wang

The true triaxial test can accurately simulate the dynamic and static load superposition environment of deep mining and then reproduce the spatial and temporal evolution process of coal-rock dynamic disasters. This study used a self-developed true triaxial coal-rock dynamic behavior test system to investigate the dynamic failure characteristics and mechanism of coal bursts under different mining-induced stress disturbances. The results show that the perturbation duration of the coal samples under quasi-static load decreases with the increase of the disturbance rate, and the perturbation stress level increases first and then decreases. The coal samples can accumulate higher strain energy and show progressive and dynamic failure. The perturbation duration and stress peak of the coal sample under the cycle load decreased with the increase of the cycle amplitude and frequency, and the coal sample first spalled off on the free surface. The damage then developed internally until the coal burst. The perturbation duration and stress peak of coal samples decrease with the increase of transient stress and the perturbation stress levels. The dynamic failure process of coal samples is straightforward, and the strength of coal burst is violent and is more difficult to predict. The conclusions obtained help to deepen the understanding of the triggering mechanism of coal bursts.

10.3390/app122110993

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Citations (1)

Mechanism of Hard‐Roof Rock Burst Control by the Deep‐Hole Blasting: Numerical Study Based on Particle Flow

Shock and Vibration (2021)

A.H. Lu Linming Dou Jinzheng Bai Yanjiang Chai Kunyou Zhou

In underground coal mines, the deep‐hole blasting (DHB) technology is generally adopted for thick hard‐roof control. This technology uses the energy released by explosives to weaken the energy storage capacity of hard roof so as to prevent hard‐roof rock burst disasters. In this paper, a numerical simulation model of roof DHB was established based on particle flow and the damage range of single‐hole blasting with concentrated cylindrical charge was studied. The temporal and spatial evolutions of overlying strata, the distribution of the force chain structure, and the working resistance of hydraulic pressure in the mining process before and after the application of DHB were contrastively analyzed. The following beneficial conclusions were drawn. The blasting‐induced single‐hole damage range is generally characterized by annular zoning. After the application of DHB, overall the collapse morphology of the key strata in the mining process changes from long‐distance instantaneous slipping instability to stratified short‐arm stepped synergistic subsidence. The density and strength of force chains in the overburden are notably reduced; the peak value of compressive force chain strength in the key strata in the mining process falls by 17.85% as a result of DHB. The monitoring results of the working resistance of hydraulic support reveal that the DHB technology can effectively shorten the step distance of periodic weighting and reduce the variation amplitude of overburden load during weighting. In summary, the mechanism of hard‐roof rock burst control by DHB is reflected by both static load reduction and dynamic load reaction.

Overburden

Rock burst

Overburden pressure

10.1155/2021/9527956

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Citations (23)

Experimental investigation into damage and failure process of coal-rock composite structures with different roof lithologies under mining-induced stress loading

International Journal of Rock Mechanics and Mining Sciences (2023)

Yanjiang Chai Linming Dou Wu Cai Piotr Małkowski Xuwei Li

Acoustic Emission

Lithology

Material failure theory

10.1016/j.ijrmms.2023.105479

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Citations (26)