Ground pressure characteristics of the ore body and the overburden deformation of the stope depend highly on the combined influence of geological conditions and mining disturbance. The ore body inclination, as a natural geological factor, has a nonnegligible effect on the underground mining. The ore angle plays a great role in the stress distribution of the overlying rock layer, resulting in the movement and destruction of the rock layer. The variation of the ore angle dominates the stress distribution of the overburden rock, the forms of movement, destruction, and the surface moving basin. Here, taking the geological mining conditions of the deep ore body mining in Jinning Phosphate Mine as the engineering background, we adopt a similar material ratio scheme of each rock layer in the mining area via the similarity theory and the principle of orthogonal experiment. We conduct systematic study on the strata movement, mining failure characteristics, and movement of the overlying rock in stope using a similar simulation test under two different ore angles of 20° and 50°. We found that, as the ore body inclination increases from 20° to 50°, the overburden unloading area of the stope extending to the deep part of the rock layer in the vertical direction is more obvious and its shape is more asymmetric about the stope center. The unloading area is more concentrated in the middle and upper part of the stope, while the upward development trend is more obvious. The relevant results can provide a certain reference for the underground mining of the mines and those with similar conditions.

中文翻译：

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基于物理模拟的不同角度开采矿体下地压

矿体地压特征和采场上覆变形高度依赖于地质条件和开采扰动的综合影响。矿体倾角作为一种自然地质因素，对地下开采的影响不可忽视。矿角对上覆岩层的应力分布起着很大的作用，导致岩层的运动和破坏。矿石角度的变化支配着上覆岩的应力分布、运动、破坏的形式以及地表运动盆地。在此，以晋宁磷矿深部矿体开采地质开采条件为工程背景，我们通过相似理论和正交试验的原理，采用了矿区各岩层的相似材料配比方案。我们在20°和50°两种不同的矿石角度下，通过类似的模拟试验，对采场内的地层运动、开采破坏特征和上覆岩石的运动进行了系统研究。我们发现，随着矿体倾角从20°增加到50°，垂直方向延伸至岩层深部的采场上覆卸载区更加明显，其形状关于采场中心更加不对称。 . 卸料区更集中在采场中上部，向上发展趋势更为明显。