为了研究煤矿矩形巷道顶板稳定性问题,根据土力学与弹性力学的基本理论,建立了矩形巷道顶板稳定性分析力学模型,分析了矩形巷道不同跨距、顶板支护强度、两帮加固岩层厚度、顶板围岩深度等因素对顶板稳定性的影响。结果表明:矩形巷道顶板围岩内应力分布呈现明显的应力拱型分布;顶板围岩浅部应力等值线呈独立卵形拱分布,随着围岩深度增加,两独立拱相互叠加,围岩应力等值线总体呈现圆弧拱分布,该拱将两独立墙包裹在拱跨之间;随着巷道跨距增加至2≤l/b≤5,拱效应衰减较快,顶板围岩自身承载能力降低迅速,当l/b>5时,顶板围岩内部附加应力主要为支护反力作用,直立墙A和B附加应力叠加基本为0,拱效应逐渐消失。并基于摩尔库伦强度理论推导出了顶板稳定性控制方程。
Abstract
In order to study the roof stability of rectangular roadway in coal mine, we established the mechanics model of rectangular roadway roof based on soil mechanics and elastic mechanics theories. The effect of roadway span length, roof support strength, thickness of side-reinforced rockmass, thickness of roof surrounding rock respectively on the roof stability were analyzed. Results showed that stress in the surrounding rock of rectangular roadway roof were apparently distributed in an arch shape. Contour of shallow stress in the surrounding rock of the roof was an independent egg shape. With the increase of surrounding rock thickness, two independent arches superposed and the stress contour became a general circular arch shape, which wrapped the two independent walls in the arch span. When span length increased to 2≤l/b≤5, arch effect accelerated its attenuation, and the self-bearing capacity of roof surrounding rock reduced rapidly; when l/b>5, uplift force caused by support became the major additional stress in the surrounding rock, and the superimposed stresses of the two walls generally equaled to zero, which suggested that the arch effect gradually disappeared. Furthermore, on the basis of Mohr-Coulomb theory, the governing equation of roof stability was derived.
关键词
矩形巷道 /
应力拱 /
力学模型 /
稳定性
Key words
rectangular roadway /
stress arch /
mechanics model /
stability
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