煤柱稳定性的时间相关性分析

利用最小势能原理，在分析了煤柱与顶板的相互关系以及煤柱受力状况后，建立了考虑顶板刚度及煤柱软化与流变特性的煤柱时间相关稳定性分析模型，引入煤岩体的蠕变本构关系，对煤柱的长期变形和稳定性进行了分析，得到了煤柱保持长期稳定的必要条件以及煤柱保持稳定的最小时间计算公式.在利用短壁开采方法控制地表沉陷的工程中，对煤柱变形与稳定性进行了预测，其结果与现场实测一致.

Analysis of the time-dependence of the coal pillar stability

The minimum potential energy principle was used to analyze the relationship between coal pillar and the roof and the force bearing condition of coal pillar, and then the analysis model on the time-dependence of the coal pillar stability was built considering the stiffness of roof and the softening and rheoloyieal characteristics of coal pillar. The creep constitutive function of coal rock mass was introduced to analyze the long time deformation and stability of coal pillar, and the necessary conditions of long time stability for the coal pillar and the minimum time formula which was used to judge the stability of coal pillar were obtained. The deformation and stabihty of coal pillar were predicted in the project on controlling ground subsidence with the short-wall mining method, and the results have a good accordance with the measurement at site.