二次支护围岩-支护结构耦合作用黏弹性解析

发布时间：2018-06-03 10:04

本文选题：围岩 + 黏弹性　；参考：《中国矿业大学学报》2017年03期

【摘要】：在地下岩体工程中,无论是软岩还是硬岩,只要岩体受力后的应力水平达到或超过该岩体的流变下限,都将随着时间的增长而发生流变变形.基于此,针对圆形断面巷道,在考虑巷道掘进面空间效应的基础上,根据黏弹性理论,建立巷道围岩与支护结构的二次支护耦合作用模型,并获取解析解.按照该思路,可递推出多次支护情况下围岩与支护结构的耦合作用过程.通过算例分析了初次和二次支护时间对支护结构与围岩以及支护结构与支护结构之间相互作用力的影响.结果显示,支护时间对支护结构与围岩以及支护结构与支护结构之间的相互作用力有显著的影响;当二次支护时间不变时,第1个支护结构与巷道围岩之间的相互作用力随着初次支护时间的增大而减小,第1个支护结构与第2个支护结构之间的相互作用力随着初次支护时间的增大而增大;当初次支护时间不变时,支护结构与围岩以及支护结构与支护结构之间的相互作用力都随着二次支护时间的增大而减小.
[Abstract]:In underground rock mass engineering, no matter soft rock or hard rock, as long as the stress level of rock mass reaches or exceeds the lower rheological limit of rock mass, rheological deformation will occur with the increase of time. Based on this, considering the spatial effect of roadway driving surface, the coupling model of secondary support between surrounding rock and supporting structure of roadway is established according to viscoelastic theory, and the analytical solution is obtained. According to this idea, the coupling process between surrounding rock and supporting structure can be deduced recursively. The influence of primary and secondary support time on the interaction between supporting structure and surrounding rock and between supporting structure and supporting structure is analyzed by an example. The results show that the supporting time has a significant effect on the interaction between the supporting structure and surrounding rock and between the supporting structure and the supporting structure, and when the time of secondary support is unchanged, The interaction force between the first supporting structure and the surrounding rock of roadway decreases with the increase of the initial support time, and the interaction between the first support structure and the second support structure increases with the increase of the initial supporting time. When the initial support time is invariant, the interaction force between the supporting structure and surrounding rock and between the supporting structure and the supporting structure decreases with the increase of the secondary support time.
【作者单位】：西安科技大学理学院;西安科技大学西部矿井开采及灾害防治教育部重点实验室;西安科技大学能源学院;
【基金】：国家自然科学基金重点项目(51634007);国家自然科学基金青年项目(51204132) 陕西省青年科技新星支持计划项目(2015KJXX-36)
【分类号】：TD26

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