条带开采煤柱长期稳定性评价及煤柱设计方法

发布时间：2018-09-09 18:04

【摘要】：煤柱在地下水、风化作用等多种因素的作用下会发生剥离和尺寸缩减,使煤柱发生渐进性失稳破坏。基于煤柱的渐进性剥离行为和剥离体的堆积特性,建立了煤柱的非均匀剥离模型;分析了煤柱剥离的影响因素、煤柱安全系数与煤柱剥离的关系,建立了条带煤柱长期稳定性评价方法;讨论了采出率、地表沉陷控制和煤柱长期安全系数的协同关系。分析表明:煤柱的剥离与煤的碎胀系数、休止角和采宽采厚比有关,可利用剥离角确定煤柱的极限破坏程度。煤柱的宽高比越大,剥离对其稳定性的影响程度越小。该模型适用于条带煤柱长期稳定性评价。
[Abstract]:Under the action of groundwater, weathering and other factors, the coal pillar will be stripped off and the size will be reduced, which will lead to progressive instability and failure of the coal pillar. Based on the progressive peeling behavior of coal pillar and the stacking characteristics of coal pillar, a non-uniform peeling model of coal pillar is established, and the influence factors of coal pillar stripping, the relationship between coal pillar safety factor and coal pillar stripping are analyzed. The long-term stability evaluation method of strip coal pillar is established, and the synergistic relationship among extraction rate, surface subsidence control and long-term safety factor of coal pillar is discussed. The analysis shows that the peeling of coal pillar is related to the breaking expansion coefficient of coal, the angle of repose and the ratio of mining width to mining thickness, and the ultimate failure degree of coal pillar can be determined by peeling angle. The greater the ratio of width to height of coal pillar, the smaller the influence of peeling on its stability. The model is suitable for long-term stability evaluation of strip coal pillar.
【作者单位】：中国矿业大学环境与测绘学院;
【基金】：国家自然科学基金资助项目(41272389) 地质灾害防治与地质环境保护国家重点实验室开放基金资助项目(SKLGP2016K008)
【分类号】：TD822.3

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