摘要
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 bearing capacity of thin roof with pure beam structure in filling route under granular fill- ing, the optimization of arch structure was proposed based on the shear stress theory formula of the pure beams and the granular arch effect. Then contrast tests were carried out to simulate on the bearing capacity of two structures by soft- ware. The results showed that the arch roof had a better bearing performance because both sides of the roof shear area had been thickened. On this basis, the roof structure optimi- zation of anchorage plate-arch in filling route was proposed to reduce the impact of the spatial connection caused by the unconnected roofs. The deformation rules during upward mining was comparative studied on three roof structures of sole beam, arch beam and anchorage plate-arch by similar material simulation. The results showed that the pure beam structure had the largest critical thickness, and appeared shear slide at both slides; the pure arch structure had a larger critical thickness and a more obvious strain than anchorage plate-arch structure. It proved that the anchorage plate-arch structure enhanced the effect of roof-contact filling, and re- stricted the roof deformation in the filling route.
出处
《矿业研究与开发》
CAS
北大核心
2016年第6期82-85,共4页
Mining Research and Development
基金
国家自然科学基金资助项目(51304083)
江西省科技支撑计划项目(20141BBE50005)
关键词
充填散体
顶板结构
锚桩盘-拱结构
应力应变规律
相似材料模型
Granular materials for filling, Roof structure, Anchorage plate-arch structure, Stress-strain law, Similar material model
