由于岩体中存在大量介质分界面，爆炸应力波在传播过程中将产生复杂的透、反射现象。基于应力波传播理论，考虑爆炸应力波在不同介质分界面上的透射传播规律，推导爆炸应力波入射小净距隧道衬砌结构的振动速度与应力关系的理论计算公式。在此基础上，结合隧道围岩和混凝土的动抗拉极限强度，依据极限强度准则，对爆破振动速度安全阈值进行求解。最后，结合工程实例，对推导的理论计算公式进行验证。计算结果表明，理论计算公式与数值模拟计算结果基本吻合，验证了理论计算公式的正确性。
Abstract
Due to the existence of a large number of media interfaces in rock mass, complex phenomena of transmission and reflection occur in process of explosion stress wave propagation.Here, based on the theory of stress wave propagation, considering transmission and propagation laws of blast stress wave on different interfaces of media, the theoretical calculation formula for the relationship between vibration velocity and stress of tunnel lining structure with small clear distance incident by blast stress wave was derived.Then, combined with the dynamic tensile ultimate strength of tunnel surrounding rock and concrete, according to the ultimate strength criterion, the safety threshold of blasting vibration velocity was solved.Finally, the derived theoretical calculation formula was verified with engineering examples.Results showed that the calculation results of the theoretical calculation formula are basically consistent to the numerical simulation ones to verify the correctness of the theoretical calculation formula.
关键词
隧道工程 /
应力波 /
透射 /
爆破振动 /
安全阈值
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Key words
tunnel engineering /
stress wave /
transmission /
blasting vibration /
safety threshold
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