摘要
通过室内模型试验,从洞室破坏形态、破坏过程、围岩径向应力、洞壁应变、拱顶和边墙位移、拱顶和底板加速度6个方面对直墙拱顶型锚固洞室在集中装药拱部侧爆条件下破坏情况和受力变形特点进行研究。试验结果表明:在拱部侧爆情况下,洞室破坏主要发生在迎爆侧半拱,破坏类型是在拱脚发生剪切破坏,在半拱中部发生拉伸破坏,洞室围岩径向应力是破坏的主要控制因素。洞室围岩以受压为主,变形主要表现为拱部和迎爆侧边墙向洞内发生位移。根据加速度测试数据,该类洞室设计时必需采取减震措施。
By model test,the damage and the deformation characteristics of reinforced tunnel,which are straight wall and vault at mass charge,bearing explosion load from the oblique upper site of vault,are studied from six aspect of destruction form,destruction course,stress in surrounding rock,surface strain of underground tunnel,the displacements of roof and sidewall,accelerations of roof and floor.Some conclusions are drawn from the model test results.Firstly,the weakest position is semiarch facing the charge,and the fracture of tunnel is mainly found there.Secondly,the radial stress in surrounding rock is the main factor controlling the damage of reinforced tunnel.Thirdly,compressive strain of surface of tunnel occupies the leading position.Fourthly,the displacements of tunnel reveal that vault and sidewall move toward interior of tunnel.Lastly,according to the data of accelerations,the measurement of shock absorption must be considered.
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2010年第1期58-61,共4页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(10772199)
关键词
锚固洞室
集中装药
拱部侧爆
模型试验
Reinforced tunnel
Mass charge
Explosion load from the oblique upper site of vault
Model test
