259 / 2023-09-30 18:48:38

Study on the spatial-temporal deformation characteristics on the slope of coal mine

Mine slope； deformation field；strain analysis；crack development；

In this study, a deformed slope at the edge of the main industrial site of Ribi Coal Mine in Qingshui County, Jincheng City, Shanxi Province, is used as an example to quantitatively investigate the property characteristics of the slope deformation through the displacement-strain model under the small deformation condition and the finite deformation condition. The results show that the deformation of this slope is characterised by double non-uniformity in the time and space domains. Before localised sliding, the deformation mainly occurs at the leading edge of the slope, and its middle and rear parts have very weak deformation during the whole monitoring cycle. After localised sliding, the expansion deformation of the whole slope undergoes rapid decay over time. As of July 2021, the expansion and compression deformations within the slope are close to 0. On the other hand, the machine value of the maximum shear strain does not show similar temporal decay characteristics. In addition, we found that the local strain extreme domain crack development is closely related. The crack location on the strong body of the landslide leading edge support has a local maximum strain rate extreme value of more than -126.8. Another crack is located at PB03 and PB04, which experiences an abrupt spatial change in the positive-negative expansion extreme value, suggesting that this crack has relatively significant local deformation even though the deformation of the entire slope is relatively stable in the time period. Overall, quantitatively investigating the characteristics of the relative deformation field of slopes and its changes with time can provide some support for further research on landslide evolution mechanisms and risk warning.