刀柱式采空区煤柱合理承载时间分析

发布时间：2018-10-31 10:43

【摘要】：为解决坚硬顶板工作面刀柱式采空区对上部煤层开采影响的问题,基于广义开尔文体描述煤柱的流变特性,建立煤柱-顶板系统力学模型,结合最小势能原理,得出采空区煤柱的有效承载时间计算公式,并依据公式对影响煤柱承载时间的影响因素进行了分析,最后结合工程实例进行验证。结果表明:采空区煤柱-顶板系统将随时间逐渐破坏至失稳;煤柱的有效承载时间与自身黏性系数成正线性关系、与瞬时弹性系数近似呈"抛物线"关系、与横截面积成正比例关系、与长期弹性系数、顶板刚度和煤柱高度近似呈负指数关系;建立的基于煤柱流变特性的采空区煤柱-顶板体系力学模型所推导出的煤柱有效承载时间计算公式具有一定的准确性。
[Abstract]:In order to solve the problem of the influence of cutter pillar goaf in hard roof working face on the mining of upper coal seam, based on the generalized Kelvin body describing the rheological characteristics of coal pillar, the mechanical model of coal pillar-roof system is established, combined with the principle of minimum potential energy. The formula for calculating effective bearing time of coal pillar in goaf is obtained, and the factors influencing the bearing time of coal pillar are analyzed according to the formula. Finally, an example is given to verify it. The results show that the coal pillar-roof system in goaf will be destroyed to instability with time. The effective loading time of coal pillar has a positive linear relationship with its viscosity coefficient, parabola relation with instantaneous elastic coefficient, a positive proportion relationship with cross sectional area, and long-term elastic coefficient. There is a negative exponential relationship between roof stiffness and coal pillar height. The formula for calculating the effective bearing time of coal pillar based on the mechanical model of coal pillar-roof system in goaf based on the rheological characteristics of coal pillar has certain accuracy.
【作者单位】：煤炭科学研究总院开采研究分院;天地科技股份有限公司开采设计事业部;
【基金】：国家科技重大专项资助项目(2016ZX05045007-003) 中国煤炭科工集团科技创新基金面上资助项目(2016MS011)
【分类号】：TD32

【参考文献】