P波作用下衬砌混凝土的爆破安全振动速度研究

Study on the safety velocity for concrete lining under P wave loading

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China

摘要: 隧洞爆破开挖诱发的爆破地震会对邻近的衬砌混凝土产生不利影响，利用应力波(P波)在混凝土与基岩结合面处的透、反射规律研究结合面处的应力状态，并通过结合面的抗拉强度分析，提出了一种确定衬砌混凝土安全振动速度的理论计算方法。计算结果表明，新浇筑衬砌混凝土极限振动速度随着基岩弹模的增大而降低，而爆破地震波频率的影响非常有限。我国现行采用的新浇筑大体积混凝土基础面上的爆破安全振动速度有一定的安全储备。
- 爆炸力学 /
- 安全振动速度 /
- 爆破振动 /
- 衬砌混凝土 /
- P波
Abstract: The vibration is induced by blasting during tunnel excavation that can have some adverse effect on the adjacent concrete lining. A theoretical method to determine safety velocity of concrete lining under blasting vibration loading is proposed, by calculating the stress on concrete-rock interface caused by blasting seismic (P wave), and analyzing the tensile strength of the interface. Calculated results show that the safety vibration velocity decrease with the increase of elasticity modulus of bedrock, and that the effect of the frequency of blasting seismic is weak. The safety vibration velocity for young foundation concrete adopted in our country is of some safety.
- mechanics of explosion /
- safety velocity /
- blasting vibration /
- concrete lining /
- P wave