摘要
运用动力有限元数值方法，研究了拱形坑道衬砌在爆破荷载作用下的破坏机理与影响破坏范围的主要因素。计算结果表明；在炸药距离坑道较近的情况下，衬砌的主要破坏形式表现为纵横方向的弯曲拉伸、竖直向的压缩剪切和内表面的层裂等复合破坏模式。随着装药距离增大，衬砌破坏范围先增大后减小，其破坏形态由压剪破坏逐渐转为拉伸破坏；混凝土衬砌中配筋率的提高对抗震塌能力有一定的提高。随着衬砌厚跨比的增大，混凝土衬砌的破坏范围逐步减小，衬砌更倾向于剪切破坏。
The dynamic finite element method is employed to analyze the failure mechanism of vaulted tunnel concrete lining and the factors influencing failure range under the impact of explosion, The result indicates that the failure mode of concrete lining is made up of flexure, stress-shear, and cracking into layers under the condition of the explosive closing to concrete lining. With the increase of the distance between the explosive and the lining, the failure range increases firstly. Then, it declines and the failure modes is converted gradually from stress-shear to flexure. The increase of reinforcement ratio can enhance the ability of tunnel resisting failure. As the ratio of thickness to height of cross-section increases, the failure range decreases and the failure mode has the tendency of sheafing failure.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期4900-4904,共5页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
爆炸荷载
混凝土衬砌
tunnel engineering
blasting loading
concrete lining
