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首页> 外文期刊>Shock and vibration >Stability Analysis and Fracture Patterns of Hard Main Roof in Longwall Top Coal Caving with Large Mining Height
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Stability Analysis and Fracture Patterns of Hard Main Roof in Longwall Top Coal Caving with Large Mining Height

机译：大型采矿高度的长墙体顶部煤矿稳定性分析与骨折图案

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摘要

In order to study the fracture patterns of hard main roof in longwall top coal caving (LTCC) with large mining height, a two-dimensional physical similarity model was created to simulate the mining process of No. 8100 large mining height face in Tongxin coal mine, China. The results show that there are three positions of broken line in hard main roof presented with the advance of longwall face, and the underground pressure induced by hard main roof fracturing presents the effect of superposition of large and small periods. It is found that there are two fracture patterns of main roof during the mining process: composite structure of lower cantilever beam and upper voussoir beam with hard main roof and composite structure instability of lower and upper voussoir beam with hard main roof. The underground pressure induced by these two fracture patterns is also analyzed by building mechanical models. In the end, the hydraulic fracture technique is introduced to presplit the main roof and weaken the effect of dynamic loads induced by composite structures instability.
机译：为了研究具有大型采矿高度的长壁顶煤崩位（LTCC）的硬主屋顶的断裂图案，创建了二维物理相似性模型，以模拟通心煤矿8100号大型采矿高度面的采矿过程， 中国。结果表明，在长壁面的前进的硬主屋顶上有三个位置，硬主屋顶压裂诱导的地下压力呈现大小周期叠加的效果。发现采矿过程中有两个主屋顶的裂缝模式：下悬臂梁和上窗口梁的复合结构，具有硬主屋顶的硬主屋顶和较低的主屋顶和上部voussoir梁的复合结构不稳定。通过建立机械模型，还分析了这两个裂缝模式引起的地下压力。最后，引入了液压断裂技术以防止主屋顶，削弱复合结构稳定性诱导的动态载荷的效果。

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