Abstract
In order to explore the mechanism of floor dynamic rupture, the current study adopts a thin plate model to further investigate the condition of floor failure. One of the possible explanations could be floor buckling due to high horizontal stress and dynamic disturbance ultimately leading to rapid and massive release of elastic energy thus inducing dynamic rupture. Seismic computed tomography and 3D location were employed to explore the evolution characteristics of floor stress distribution and positions of mine tremors. In the regions of floor dynamic rupture, higher P-wave velocity was recorded prior to the dynamic rupture. On the contrary, relatively lower reading was observed after the dynamic rupture thus depicting a high stress concentration condition. Meanwhile, evolution of mine tremors revealed the accumulation and subsequent release of energy during the dynamic rupture process. It was further revealed that dynamic rupture was induced due to the superposition of static and dynamic stresses: (i) the high static stress concentration due to frontal and lateral abutment stress from coal pillar and (ii) dynamic stress from the fracture and caving of coal pillar, hard roof, and key stratum. In the later part of this study, the floor dynamic rupture occurrence process would be reproduced through numerical simulations within a 0.6 sec time frame. The above-mentioned findings would be used to propose a feasible mechanism for prewarning and prevention of floor dynamic rupture using seismic computed tomography and mine tremors 3D location.
Highlights
Demand for fossil fuel, especially coal, has been increasing rapidly in China and worldwide
In order to explore the mechanism of floor dynamic rupture, this paper adopts a thin plate model to investigate the floor failure condition
Using the parameters of P-velocity distribution and stress concentration factor, the evolution characteristics of dynamic rupture were explored in the 1307 LCF, and the regions of tailentry and local 1307 LCF experienced higher wave velocity prior to the dynamic rupture and lower wave velocity after the dynamic rupture
Summary
Demand for fossil fuel, especially coal, has been increasing rapidly in China and worldwide. Several scholars have adopted various methods to study floor failure, for example, numerical simulation (UDEC), laboratory experiments, and in situ tests. Investigated the roadway faces failure mechanism by conducting small scale model tests. A. Tang [11] adopted numerical simulations to study the impact of humid conditions on the floor rupture of roadway in the swelling ground. Many scholars have studied dynamic rupture induced by hard rock [14], coal pillar [15, 16], fault [17, 18] and tectonic stress [19, 20], employing stress, strain and energy, and so forth as frequently used parameters but very few literatures had focused on floor dynamic rupture. Numerical simulation was adopted to reproduce the floor dynamic rupture process owing to its geological setting
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