锚杆长度对洞室抗爆性能影响的模型试验研究  

Model experiment study on influence of anti-blast characteristics of rock bolt length on wall rock of underground cavern

作　　者：杨自友[1,2] 顾金才[2,3] 陈安敏[3] 徐景茂[3] 

机构地区：[1]安徽建筑工业学院土木工程学院,合肥230022 [2]中国科学技术大学近代力学系,合肥230026 [3]总参工程兵科研三所,河南洛阳471023

出　　处：《振动与冲击》2009年第1期24-27,50,共5页Journal of Vibration and Shock

摘　　要：采用模型试验的方法,在集中装药爆炸波作用下,研究了长度不同的锚杆对洞室围岩的抗爆性能的不同影响程度,比较和分析了测点的应力、洞壁表面应变、洞室顶底板相对位移、顶底板及侧墙加速度和围岩宏观破坏形态。结果显示:较长锚杆可以扩大对围岩的加固范围和改变拱顶围岩的受力状态,有效限制围岩的变形,能较好地维护了洞室的稳定性;当锚杆间距一定时,破坏裂纹只是在锚杆加固区域外产生和延伸,试验结果为防护工程及坑道围岩的加固方法提供了参考。Different influence levels of anti-blast of wall rock reinforced by two kinds of rock bolts which have different length around two underground openings were studied using a model experiment method under action of explosive stress waves produced by focus charging.The effects of the different length of the rock bolts on stress in wall rock,surface strain of two underground openings,the roof-to-floor relative displacements of two underground openings,accelerations of roof,floor and ribs as well as macroscopical damage forms were compared and analyzed.The results indicated that when the wall rock of underground openings is reinforced by the longer rock bolts,the reinforcement range can be enlarged and the stress state of the vault wall rock can also be modified,the distortion of the wall rock is restricted efficiently and the stability of the underground cavern is maintained.When the distance between rock bolts reaches a given size,the damage cracks produced and extended only exist outside the reinforced zone.The experiment results provided a reference for reinforcement methods of wall rock in protection projects and tunnels.

关 键 词：锚杆 岩石力学 爆炸应力波 模型试验 

分 类 号：TU457[建筑科学—岩土工程]