下穿村庄隧道爆破振动对地表建筑的影响  

Blast-induced ground vibration from tunnel undercrossing a village

作　　者：樊浩博[1] 邱军领 谢永利[1] 郭春霞[2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]西安建筑科技大学理学院,陕西西安710055

出　　处：《解放军理工大学学报（自然科学版）》2016年第3期209-214,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：中央高校基本科研业务费专项资金资助项目(310821165011);交通运输部西部交通建设科技资助项目(200731800018)

摘　　要：为研究下穿村庄隧道爆破施工时对地表建筑结构的影响,以某隧道为依托,采用数值模拟对地表建筑质点振动速度进行了分析,并与建筑结构的应力分布规律进行了对比,结合现场爆破振动测试,对地表振动速度衰减规律进行了研究,并指出了爆破振动的显著影响区域。数值模拟结果表明：隧道爆破时,地表建筑的竖向振动速度远大于横向,随着时间和距离的增大,振动速度迅速衰减;地表建筑主要承受水平方向的拉应力,振动速度不能完全反映建筑结构的受力状况。现场测试结果表明：地表振速随着与爆源距离的增大迅速下降;装药量为54kg时,地表振动速度最大为1.313cm/s。距爆源水平距离0-50m范围是爆破振动显著影响区域,模拟结果和测试结果吻合良好。To study the effect of blasting-induced vibration on ground buildings when tunnel undercrossing a village, based on a highway tunnel, the peak particle velocity （PPV） of the ground buildings was simula- ted using a 3D numerical model, and the comparative study of the stress of building structure and vibration velocity conducted. The attenuation of ground vibration velocity was analyzed combined with a blasting vibration test, and the significantly affected region also proposed. The numerical results show that the verti- cal vibration velocity is much larger than transverse velocity in the tunnel blasting construction. And the vibration velocity decreases quickly with the increase of time and distance. The ground buildings are mainly subjected to horizontal tensile stress under the blasting loads. PPV cannot totally represent the stress state of the buildings. The test results indicate that PPV decreases with the increase of distance to the blasting source. PPV is only 1. 313 cm/s when the explosive charge is 54 kg. The significant horizontal affection re- gion of blasting vibration is within 50 m to blasting source, and the numerical results and the test results are consistent.

关 键 词：下穿村庄隧道 数值模拟 现场测试 振动速度 应力 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]