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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >3D analysis of longwall face stability in thick coal seams
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3D analysis of longwall face stability in thick coal seams

机译：厚煤层长墙面稳定性的3D分析

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摘要

Face falls remain the most difficult engineering problem in single-cut longwall mining. In this paper we investigated mining of two adjacent longwall faces using 3D nonlinear analysis, to obtain a better understanding of the stress distribution around excavations and development of failed zones. The gob loading behaviour was included by applying a variable force to the roof and floor behind the longwall face. The results show that:(1) Face failures developed in the upper portion of the face extend deeper ahead of the mined face than those in the bottom portion,(2) Stress distribution and development of yielded zones ahead of the coal face vary along the panel width,(3) The maximum vertical stress concentration factor (VSCF) ahead of the longwall face occurs around the middle section of the panel width,(4) The middle section of a longwall face also experiences the most failed zones in the unmined coal,(5) The previously mined-out face increases the VSCF and volumes of failed zones in the adjacent longwall face; however, the effect extends only a short distance along the width of the panel close to the previously mined-out panel,(6) With increasing seam height, the stiffness of the coal face is reduced and therefore the longwall face carries less vertical load, but it deforms more and the yielded zones are larger,(7) With decreasing GSI of the mined seam mass, the cohesion and angle of internal friction are reduced, resulting in a lower vertical stress concentration factor and larger yielded zones spatially ahead of the face.
机译：脸部落下仍然是单削长墙矿业中最困难的工程问题。在本文中，我们使用3D非线性分析调查了两个相邻的长墙面面的挖掘，以更好地了解挖掘和发育失败区域的应力分布。通过将变量力应用于长墙面背后的屋顶和地板来包括GOB加载行为。结果表明：（1）在面部的上部开发的面部故障在开采的面前延伸比底部的面部更深，（2）煤面前方的屈服区的应力分布和发育变化沿着面板宽度，（3）在长墙面面前的最大垂直应力集中因子（VSCF）发生在面板宽度的中间部分周围，（4）长墙面的中间部分也经历了未传输煤中最失地的区域（5）（5）先前采矿面增加了相邻的长墙面中的VSCF和失效区域的卷;然而，效果仅沿着靠近先前喷出的面板的面板的宽度延伸的短距离，（6）随着接缝高度的增加，煤面的刚度降低，因此长壁面携带较少的垂直载荷，但是，越来越变形，并且所产生的区域较大，（7）随着挖掘接缝质量的降低，内部摩擦的内聚力和角度降低，导致较低的垂直应力集中因子和较大的屈服区域在脸部前面空间地均匀。

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