【摘要】 基于泡沫混凝土作为隧道隔震材料在力学性能上的要求,开展了影响泡沫混凝土隔震性能的九因素四水平正交试验,通过正交试验得到了影响泡沫混凝土隔震性能的主要因素及各组分的最佳配合比,并研制得到了一种高性能泡沫混凝土。静力与动力试验结果表明该高性能泡沫混凝土的强度、延性、防水性能较普通泡沫混凝土都有明显改善。同时,为验证其作为隧道隔震层的减震效果,将其运用于西藏嘎隆拉隧道洞口段的抗震计算中。数值计算结果显示高性能泡沫混凝土可以有效降低隧道衬砌单元的应力及塑性破坏区的大小,从而证明其具有良好的隔震性能。综合考虑高性能泡沫混凝土的隔震性能与经济性,研究成果对高烈度区隧道的抗震设计有较好的借鉴意义。更多还原

【Abstract】 Protecting the lining of the tunnel with high intensity by coating materials is an effective way to reduce seismic damage.In order to produce a type of economical and reliable seismic-isolation material,an orthogonal experiment on foam concrete is performed.The main factors influencing the seismic-isolation property and the optimum mixture ratio of foam concrete are obtained,and a new type of high-performance foam concrete is developed.The static and dynamic tests results show that the strength,ductility and watertightness of the foam concrete are significantly improved.Besides,in order to check its seismic-isolation property,the high-performance foam concrete as filling materials of Galongla tunnel in Tibet is simulated by FEM.The simulated results show the high-performance foam concrete can remarkably decrease the stress and the plastic zone in final lining,so it can effectively reduce the seismic damage of the tunnel.Considering the seismic-isolation property and low price of high-performance foam concrete,it is a good reference for the anti-seismic design of tunnels in high intensity zone.更多还原