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为提高散体充填体下进路纯梁结构薄顶板的自身承载性能,基于纯梁剪应力理论公式及散体搭拱效应提出拱结构优化,利用软件进行两种结构的承压对比模拟试验,结果表明,加厚顶板两侧剪切区域的拱结构承载性能更优。在此基础上,为降低充填未接顶空间贯通的影响,提出锚桩盘-拱形充填进路顶板结构支护优化,利用相似模型试验模拟研究纯梁、纯拱、锚桩盘-拱3种结构上采过程中顶板变形变化规律,结果表明,纯梁顶板临界厚度最厚,两侧剪切滑落,纯拱顶板临界厚度比锚桩盘-拱大,两侧应变更明显,表明锚桩盘-拱结构增加了充填接顶效果,且对充填进路顶板变形有限制作用。
In order to improve the self-bearing performance of the thin roof under purefill structure, the optimization of arch structure is proposed based on the theoretical formula of pure beam shear stress and the effect of bulk arching. By means of software simulation test of the two structures, The results show that the arch structures on both sides of the thickened roof have better bearing capacity. On this basis, in order to reduce the influence of the unfinished roof space penetration, the roof support optimization of the anchor-arch-arch filling approach is proposed, and the simulation analysis of pure beam, pure arch and anchor plate-arch 3 The results show that the critical thickness of the pure beam roof is the thickest with the shear thinning on both sides, and the critical thickness of the pure arch roof is larger than that of the anchor plate-arch, and the strain on both sides is more obvious, which shows that the anchor pile The disk-arch structure increases the effect of filling the roof and has a limiting effect on the deformation of the roof of the filling road.