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Abstract
In this study, based on the example of the ground vibration damage response of a thick and hard rock layer fracture type mine quake, and by applying the theories of mine pressure, rock mechanics and vibration energy principle, the concept of “vibration damage boundary” of mine quake ground, which uses particle vibration velocity to evaluate the vibration damage, is proposed. In addition, the quantitative prediction method of the ground vibration damage boundary is preliminarily established. The research results reveal that the elastic deformation of the fixed support end of the thick and hard rock layer structure in the stope is the main energy source for the formation of mine quakes, and that the particle vibration velocity caused by the propagation of focal energy to the ground can reasonably reflect the response degree of vibration damage. The proposed prediction method considers the “instantaneous” motion characteristics of mining thick and hard rock layer and the dynamic load effect of “mine quakes.” The method can deepen our understanding of mining ground damage prediction, and increase the reliability of ground damage boundary prediction. Finally, the results are used to predict the ground vibration damage boundary of limestone primary fracture in the longwall 16101 face of the Fuping Coal Mine.
Highlights
Mining ground damage is one of the main research areas in the coal mining industry. [1–2] For a long period time, with the continuous exploitation of China’s underground coal resources, the frequency of mine quakes has drastically increased. [3–5] In addition to inducing disasters such as underground rockburst, shallow surface strong mine quakes may cause certain vibration damage to ground facilities, intensify the contradictions of workers and farmers in the mining area, and affect the stability and stable development of the mining area, and even society as a whole
Mine quakes with energy greater than 10 [5] have occurred in typical thick and hard rock mines such as the Yima Qianqiu Coal Mine, Xinwen Huafeng Coal Mine and Yanzhou Nantun Coal Mine in China. [11–13] Due to the fact that the thick and hard rock layer has the characteristics of large thickness, high strength, good integrity and great distance from the coal seam, the mine quake induced by the fracture of thick and hard rock layer often possesses the remarkable characteristics of “large fracture scale,” “high released energy” and “long vibration propagation distance.”
The view of “ground vibration damage boundary” was proposed based on the cases where mine quake was induced by the movement of thick and hard rock layer, and the laws of thick and hard rock layer and energy propagation
Summary
Mining ground damage is one of the main research areas in the coal mining industry. [1–2] For a long period time, with the continuous exploitation of China’s underground coal resources, the frequency of mine quakes has drastically increased. [3–5] In addition to inducing disasters such as underground rockburst, shallow surface strong mine quakes may cause certain vibration damage to ground facilities, intensify the contradictions of workers and farmers in the mining area, and affect the stability and stable development of the mining area, and even society as a whole. [8–10] Underground mining results in thick and hard rock layer fractures to induce mine quakes, and the ground vibration damage. [14–15] In the past, the prediction of mining ground damage boundary has mainly been based on the laws of rock strata movement and surface subsidence, which mainly investigated the “slow” movement characteristics of rock strata from mining overburden to the ground. It did not fully consider the ground “vibration damage boundary” caused by the mine quake induced by “instantaneous” fracture of thick and hard rock layers in the stope. The present paper, based on the engineering background of ground vibration damage induced by thick and hard rock layer fractures in the Fuping Coal Mine, Hebei Province, explores the ground vibration damage principle and boundary prediction model of thick and hard rock layer fracture, so as to provide a novel understanding and method for the theoretical research and boundary prediction of ground damage in coal mining
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