二次支护围岩-支护结构耦合作用黏弹性解析  

Visco-elastical analysis on interaction between surrounding rock mass and liners of two support processes

作　　者：罗生虎[1,2] 伍永平[2,3] 解盘石[2,3] 

机构地区：[1]西安科技大学理学院,陕西西安710054 [2]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,陕西西安710054 [3]西安科技大学能源学院,陕西西安710054

出　　处：《中国矿业大学学报》2017年第3期528-536,共9页Journal of China University of Mining & Technology

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)

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.In the underground rock engineering,the mechanical properties of surrounding rock mass exhibits time-dependent,as long as the rock mass stress level reaches or exceeds the rock rheological limit.In this paper,based on the viscoelastic theory,a time dependent viscoelastic model of coupling action between surrounding rock mass and support,which includes the two support process and the spatial effect of excavation face,was employed,and the analytical solution was obtained.At the same time,according to the solving method advised by this paper,the coupling action between surrounding rock mass and many supports could also be obtained.Then,the influence of the installation time on the support force was discussed in detail byacase.The results show that the installation time has a certain impact on the stability of tunnel.With the increase of the first installation time,the support force between surrounding rock mass and first support decreases,but the support force between first support and second support increases.With the increase of the second installation time,the support force between surrounding rock mass and first support and the support force between first support and second support both decrease.

关 键 词：围岩 黏弹性 耦合 支护时间 

分 类 号：TD26[矿业工程—矿井建设]