机械施工荷载作用下采空区顶板稳定性研究

发布时间：2018-04-22 15:32

本文选题：突变理论 + 地面荷载　；参考：《中国安全科学学报》2017年07期

【摘要】：为保证采空区上方作业人员和采掘设备安全,采用力学分析方法,将浅埋采空区顶板概化为固支梁力学结构模型,建立地面机械施工荷载-采空区顶板系统总势能方程。基于突变理论,构建采空区顶板失稳的尖点突变模型,获得采空区顶板突变失稳判据,建立采空区顶板保持稳定情况下机械施工荷载计算模型,并进行实例验证。结果表明:采空区顶板岩梁所受侧向水平推力越大,岩梁弹性模量越小,采空区跨距越大,采空区顶板越容易发生突变失稳,其失稳的必要条件取决于顶板内部特性,与外部作用无关;地面施工荷载作用下采空区顶板失稳的充要条件取决于顶板内部特性和外部作用。
[Abstract]:In order to ensure the safety of the workers and mining equipment above the goaf, the mechanical analysis method is used to generalize the roof of the shallow goaf as the mechanical structure model of clamped beam, and the total potential energy equation of the roof system in goaf is established. Based on the catastrophe theory, the cusp catastrophe model of roof instability in goaf is constructed, and the criterion of sudden instability of roof in goaf is obtained, and the calculation model of mechanical construction load under the condition of roof stability in goaf is established, and an example is given to verify the model. The results show that the greater the lateral horizontal thrust of roof slate beam in goaf, the smaller the elastic modulus of rock beam, the larger the span of goaf, the more prone to sudden instability of roof in goaf, and the necessary condition of instability depends on the internal characteristics of roof. The sufficient and necessary condition of roof instability in goaf under ground construction load depends on the internal characteristics and external action of roof.
【作者单位】：武汉科技大学资源与环境工程学院;冶金矿产资源高效利用与造块湖北省重点实验室;
【基金】：国家自然科学基金资助(51574183)
【分类号】：TD327.2

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