Abstract
In this study, a self‐designed scaled physical model was conducted to investigate the variation laws of lateral pressure under different stoping sequences and granular gradings, and drawing ore in the experiments was used to simulate the mining process. Under the limiting equilibrium state, the values of lateral pressure increased exponentially with the increasing depth of granular media, and the growth rate of lateral pressure gradually decreased as the depth of granular media increased. Then, the laboratory results indicated that the distribution laws of lateral pressure were divided into three parts, namely, the drawing influencing region, the upper descending zone, and the central growth area. As the height of the isolated extraction zone (IEZ) increased, the scope of the drawing influencing region and the upper descending zone increased, while the range of central growth area decreased. In the case of an invariable height of IEZ, more reduction ratio and the scope for drawing influencing region could be appeared in the lower wall. Increasing the space between the drawpoints and granular grading were an effective way to control the reduction rate of lateral pressure in the drawing influencing region, while the scope of the above parts kept stable. Moreover, the average values of lateral pressure showed an increasing trend as the granular grading decreased at the same number of drawing ore.
Highlights
En, the corresponding drawpoints were unfolded and the previous steps were repeated
Ren et al [35] and He et al [36] reported the distribution laws of lateral pressure from different orebody dip conditions, which seemed consistent with the scope of drawing influencing region, but to a certain extent had its variation on the upper descending zone and the central growth area. ese abovementioned results are under the invariable width of orebody, and the vibration of blasting is not considered; further studies are essential to improve this simple description to the more comprehensive results of complex gravity flow encountered in actual mines
A laboratory-scaled physical model was designed to investigate the influence of stoping sequence and granular grading on the lateral pressure during the drawing process
Summary
Castro et al [31] reported that the shape of the isolated extraction zone (IEZ) was not significantly affected by the geometrical scale using a large 3D physical model. The drawing-ore device was made up of upper and lower walls, front and back walls, drawpoints, and test channels, with the size of 50 cm × 25 cm × 160 cm (width × length × height). En, the values of lateral pressure with different heights were transferred from the test channels to the data collection system during the drawing process. A total of 9 physical simulation tests were designed to study the influence of the stoping sequence and granular grading on the distribution laws of lateral pressure. Measured height (m) 1.45 1.25 1.05 0.85 0.65 0.45 0.25 0.05 1.45 1.25 1.05 0.85 0.65 0.45 0.25 0.05 on the testing data, the drawing-ore device was remained horizontal on the ground and the adjusting bar was fixed on the experimental model. After completing the above steps, the drawpoints were blocked with the elastic materials so as to simulate the real state without blasting. en, the incompact ores were
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