Abstract
The stability of open-pit mining is a hot issue in geotechnical engineering. A mining railroad is in operation on the slope where the east exhaust inclined shaft and the east sand injection inclined shaft on the Laohutai Mine are located, and it was necessary to determine whether railroad vibration would have an impact on the safety of the inclined shafts. With this project as the background, the dynamic response of the slope with inside two inclined shafts was conducted under train loading. A three-dimensional numerical model by using PLAXIS 3D was established to analyze the stability of the slope. The results show that the dynamic reaction caused by the full-loaded train is significantly greater than the no-load train. The safety factor of the slope under the dynamic load is 1.201, and the maximum displacement of the slope which occurred in the gravel layer directly beneath the train track is about 5 mm. The acceleration responses of the two inclined shafts are almost consistent. The maximum horizontal and vertical acceleration occur at the epidote weak layer. The acceleration directly below the load increases significantly. Therefore, it can be considered that the slopes are stable under the action of train vibration, and the influence on the two inclined shafts is small and negligible.
Highlights
The waste dump is the inevitable product of open-pit mining, because it is generally adjacent to the mining site, and its stability is related to the safety of draining open-air mining age and stripping personnel and equipment [3,4,5]
Slope Stability Analysis imum horizontal acceleration of 0.23 g, vertical acceleration of 0.32 g is close to the measAfter applying train load, the displacement of slope is shown in Figure 14 below
The horizontal and vertical accelerations change in a the scale of the inclined shaft in Laohutai mine is rare in the world
Summary
Open-pit mining is an important method of mineral resources mining [1,2]. According to the existing data, China’s open-pit iron ore production accounts for about 90% of the total iron ore output, non-ferrous metals account for about 52%, chemical minerals account for about 7%, and construction materials are nearly 100%. The waste dump is the inevitable product of open-pit mining, because it is generally adjacent to the mining site, and its stability is related to the safety of draining open-air mining age and stripping personnel and equipment [3,4,5]. Scholars in the open-air mining industry have attached great importance to the research of the waste dump. With the development of open-pit mining, the stability of open-pit high slope and inclined shaft has become one of the key technical problems in mine resources development [11]
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