摘要
为了研究隧道爆破振动施工对隧道混凝土二衬结构的影响,结合湖南省张家界老木峪2号隧道对自制不同强度的混凝土试块在不同龄期、不同爆心距的条件下进行爆破振动试验。首先通过正交试验判断出爆破振动对各因素影响程度的大小,然后采用压力试验机测出不同强度混凝土试块的极限荷载,最后通过混凝土试块抗压强度的变化规律分析其对二衬结构的影响。试验结果表明:混凝土强度是抵抗爆破振动的主要因素,在Ⅳ级围岩台阶法施工情况下,24 h龄期时距爆破中心60 m处的C45强度混凝土受爆破影响最小。爆心距15 m处,C30,C35,C40和C45的混凝土强度折减比分别为21.1%,16.8%,13.2%和1.0%,远大于爆心距60 m处C30,C35,C40和C45的混凝土强度折减比4.1%,3.1%,2.2%和2.1%。
In order to investigate the effect of blasting vibration construction on the secondary lining of tunnel,blasting vibration tests were carried out on self-made concrete blocks with different strength at different ages and different distance from explosive source blasting in Laomuyu No.2 Tunnel of Zhangjiajie,Hunan Province.First,the influence degree of blasting vibration on each factor was judged by orthogonal tests.Then,the ultimate load of concrete blocks with different strength was measured by pressure testing machine.Finally,the influence of blasting vibration on the secondary lining was analyzed by the change rule of compressive strength of concrete blocks.The test results show that the concrete strength is the main factor to resist blasting vibration.Under the condition of stage IV surrounding rock bench construction,the C45 strength concrete at 60 m from the blasting center in 24 hage period is least affected by blasting.The strength reduction ratios of C30,C35,C40 and C45 are 21.1%,16.8%,13.2%and 11.0%respectively at 15 m of the detonation center distance,which are much larger than those of C30,C35,C40 and C45 at 60 m of the detonation center distance by 4.1%,3.1%,2.2%and 2.1%.
作者
陈秋南
贺泳超
邹根
李君杰
周相识
周光裕
CHEN Qiunan;HE Yongchao;ZOU Gen;LI Junjie;ZHOU Xiangshi;ZHOU Guangyu(Hunan Provincal Key Laboratory of Geotechnical Engineering for Stablility Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Sunshine Construction Co.,Ltd,Changsha 410022,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2020年第3期676-681,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51909087,51878270,51778227)
湖南交通科技进步与创新项目(201712)
湖南省教育厅科研项目(18K064)。
关键词
隧道
爆破振动
混凝土强度
二次衬砌
tunnel
blasting vibration
concrete strength
secondary lining
