This paper is a tentative research on the fundamental law of the ground movement due to underground mining.

本文是用碎块体理论研究由于地下开采引起的岩层和地表移动的基本规律的初步尝试。

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The voltage loss calculating method of the low voltage electrified wire netting at ground mining area is introduced.

介绍了煤矿井下采区低压电网电压损失的计算方法。

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However, the displacement and deformation of surface ground by underground mining have destroyed initial equilibrium between the building and the ground.

但是由于地下开采引起地表产生的移动和变形，破坏了建筑物与地基之间的初始平衡状态。

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These include increasing difficulties of mining far below the ground in the key producing nation of South Africa, as well as labor issues that mean higher costs and the threat of supply disruptions due to strikes.

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Public mineral resources become private the minute you pull them from the ground, meaning the only costs incurred from mining on public land are operating expenses.

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At that time, a small quantity of US shale oil was being unlocked by mining the rock out of the ground, trucking it to centralized plants, and heating the rock to release the hydrocarbons.

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