摘要
为了防止浅埋隧道爆破振动对其上方建筑物的损坏，对爆破引起地表振动机理进行了研究．某隧道进口浅埋段沿隧道纵向用爆破振动仪器对振动速度进行了跟踪监测，发现存在空洞效应，即无论在掌子面前方还是后方，离掌子面10m处，地表振动速度最大，并向两侧衰减，且成洞区地表振动速度是对称于掌子面的非成洞区振动速度的1．3倍，随着距离增加振动速度减小；采用数值模拟方法进行研究，发现类似结论．在浅埋隧道爆破施工中，成洞区地表的振动速度具有放大作用，是非成洞区的1．2—1．5倍．如果在浅埋隧道实施爆破防振措施时没有考虑到空洞效应，会导致振动效应判据和安全距离失误，引起工程事故．
In order to prevent damage of building induced by blasting vibration in shallow tunnel, the surface vibration mechanism from blasting vibration is studied. Ground velocity was monitored a- long tunnel longitudinal direction of the entrance of some tunnel by using blasting vibration instru- ment. The result shows that whether in front of the face of tunnel or at the back of the face of tunnel along tunnel longitudinal direction the vibration velocity at 10 m from the face is the biggest and vi- bration velocity of cavity zone is 1.3 times of that of non-cavity zone symmetrical about the face, and then the velocity decreases with the distance increasing. This is hollow effect. The conclusion was proved with numerical simulation. During the construction of shallow tunnels, ground vibration velocity of cavity zone is amplified, being 1.2 - 1.5 times of that of non-cavity zone. If hollow effect induced by blasting vibration in shallow tunnel is not taken into account, errors in criterion of vibration effect and safety distance would occur, which may cause engineering accidents.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第1期176-179,共4页
Journal of Southeast University：Natural Science Edition
关键词
浅埋隧道
空洞效应
爆破
振动速度
振动效应判据
衰减规律
shallow tunnel
hollow effect
blasting
vibration velocity
criterion of vibration effect
attenuation law
