厚砾石层斜井开挖围岩破坏机理模型试验研究  

Experimental study of the failure mechanism in surrounding rock of an inclined shaft excavated through a thick gravel stratum

作　　者：岳中文[1] 杨仁树[1,2] 孙中辉[1] 窦波洋[1] 潘长春[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,北京100083 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《中国矿业大学学报》2011年第3期368-372,共5页Journal of China University of Mining & Technology

基　　金：国家"十一五"科技支撑计划项目(2007BAK24B00);中央高校基本科研业务费资助项目

摘　　要：以新疆伊犁一矿为工程背景,通过相似模拟试验研究了厚砾石层斜井围岩破坏机理,分析了围岩压力和位移变化规律.研究表明,在斜井开挖过程中,井筒围岩塌方破坏从拱顶开始,并逐渐向上发展;无水砾石层井筒围岩从浅到深,随着压力差的增大,对应部位围岩失稳的可能性也越大;井筒开挖过程中,围岩应力总体呈下降趋势变化,围岩破坏过程中,拱顶和两帮垂直、水平应力均呈减小趋势变化;拱顶围岩位移变化量大于侧帮位移量,底板位移量最小.研究结果为优化支护方式提供了实验依据.The mechanism of failure in surrounding rock of an inclined shaft built through a thick gravel stratum at the First mine of Yili in Xinjinag municipality was investigated.The stresses and strains in the rock were analyzed.The collapse begins at the dome and gradually caves upward during the excavation process.Greater pressure differences in the surrounding rock increase the likelihood that the structure will be unstable.Stress declines in the wall rock as excavation proceeds.And,both vertical and horizontal stresses within the vault and two side walls are reduced by rock failure.Vault rock is displaced more than side wall rock while the floor stratum shows the least displacement.These results will be helpful for the optimization of support design during practical engineering.

关 键 词：厚砾石层 斜井 破坏机理 模型试验 

分 类 号：TD322[矿业工程—矿井建设]