Theoretical and numerical investigations of floor dynamic rupture: A case study in Zhaolou Coal Mine, China

Mu, Zonglong; Liu, Guangjian; Yang, Jianguo; Qiang, Zhang; Javed, Atif; Gong, Shaokun; Cao, Jinglong

doi:10.1016/j.ssci.2018.12.016

Cited by 33 publications

(11 citation statements)

References 23 publications

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“…For seismic tomography, the index for static loads, according to its formula and partition of risk level, the higher the coefficient of anomaly of wave velocity within inversion region is, the higher the static stress and thus the larger the risk of coal bursts [25][26][27][28][29].…”

Section: Monitoring and Warning Indicesmentioning

confidence: 99%

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

Wang

et al. 2020

Advances in Civil Engineering

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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 (Rr and Rf) 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 Rr was significantly higher than that of Rf, 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 Rr and Rf can be considered as precursory information for predicting coal bursts.

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Section: Monitoring and Warning Indicesmentioning

confidence: 99%

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

Wang

et al. 2020

Advances in Civil Engineering

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“…anomaly (A n ) and the value to express the variation degree of velocity gradient (VG) are shown as follows [32,33]:…”

Section: Shock and Vibrationmentioning

confidence: 99%

Study on Roof Breakage‐Induced Roadway Coal Burst in an Extrathick Steeply Inclined Coal Seam

Wang

Cao

et al. 2019

Shock and Vibration

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In view of the coal burst induced by roof breakage in the steeply inclined coal seam (SICS) roadway and its mechanism, a mechanical model was established to investigate the distribution of dynamic and static stresses in the coal seam before and after the breakage of a thick hard roof. The aim of this research is to study failure laws of SICS roadways under the superposition of dynamic load induced by roof breakage and asymmetric static load. For this purpose, response characteristics including acoustic emission (AE), static stress, and acceleration were analyzed by applying different dynamic loads to different horizontal slices with a self-made similarity simulation test apparatus under combined dynamic and static loads. The theoretical model and simulation results were verified by analyzing characteristics of coal burst occurrence in the field, microseismic (MS) events, and tomographic imaging of microseismic waves. The study demonstrates the following: (1) The abutment pressure of the roof plays a dominant role in stress distribution of the coal seam slice before the breakage of the thick hard roof with the stress of the roof roadway (Rr) being obviously higher than that of the floor roadway (Rf). (2) High-energy MS events and AE events are concentrated on the roof side after the breakage of the thick hard roof, and coal bursts are more easily induced by the superposition of high dynamic and static stresses on the roof side. Coal burst in the roadway is jointly determined by dynamic and static stresses. Under the same static stress, response characteristics increase with the rise of intensity of dynamic loads. When dynamic stress is the same, coal burst easily occurs in the roadway with high static stress.

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“…According to the maximum horizontal stress theory [21,22], the horizontal stress is usually greater than the vertical stress, and the stability of the roadway roof and floor is mainly affected by the horizontal stress. erefore, after the excavation of the bottom gas extraction roadway, the vertical stress transfers to the ribs and the horizontal stress transfers to the roof and floor.…”

Section: Analysis Of Stress and Deformation Law Of A Bottom Gas Extramentioning

confidence: 99%

Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference

Pan

et al. 2019

Advances in Civil Engineering

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Taking Pingbao Coal Mine as the engineering background, the stress distribution, surrounding rock displacement, and plastic zone distribution characteristics of a bottom gas extraction roadway are simulated by FLAC3D under multiple disturbances. The mining disturbance due to the overlying coal seam is obtained: the deformation of the roof subsidence and lower rib closure of the bottom gas extraction roadway are larger than the floor heave and upper rib closure, respectively. According to the mechanical analysis of the bottom gas extraction roadway, the equations for calculating the displacement at each point on the surface of the bottom gas extraction roadway and the methods for calculating the maximum displacement, the maximum normal stress, and the maximum shear stress are obtained to reasonably explain the deformation of the bottom gas extraction roadway under multiple disturbances. Then, the bolt-mesh-anchor and ladder beam support mode are designed. After onsite observation of the bottom gas extraction roadway of the 12030 coal mining face of the Pingbao Coal Mine, it is concluded that the deformation characteristics of the bottom gas extraction roadway basically conform to the abovementioned equations and that the support is effective. This paper can provide a reference for the optimization of bottom gas extraction roadway positioning, the determination of support parameters, and the deformation prediction around a bottom gas extraction roadway under similar conditions.

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Theoretical and numerical investigations of floor dynamic rupture: A case study in Zhaolou Coal Mine, China

Cited by 33 publications

References 23 publications

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

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

Study on Roof Breakage‐Induced Roadway Coal Burst in an Extrathick Steeply Inclined Coal Seam

Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference

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