成层饱和砂中输水隧洞的地震响应及减震技术研究

It has important application value to study the seismic response and the seismic reduction technique of convey tunnel in saturated sand layers in the guarantee of urban water supply security. By using a theory analysis method, this project intends to study the seismic problem of convey tunnel in saturated sand layers. Firstly, we will develop a seismic study model about convey tunnel in saturated sand layers, and will obtain wave field of the model and seismic response of the convey tunnel by using the wave function expansion method, and will analyze the impact of various factors on the earthquake response of the convey tunnel lining, and will get the earthquake disaster mechanism and principles of the water convey tunnel eventually. Secondly, establish dynamic analysis models of the water convey tunnel in saturated sand layers respectively adopting technologies of foam concrete shock absorption layer and tunnel surrounding rock grouting reinforcement, reveal the working mechanism of the various methods of vibration isolation technology of the water convey tunnel in saturated sand layers, so as to put forward suitable technical means for stratified water conveyance tunnel in saturated sand shock absorption technology. Through research, we will reveal the earthquake damage mechanism and the vibration isolation technology’s damping effect of the convey tunnel in saturated sand layer, and provide certain theoretical reference for convey tunnel seismic design and reinforcement.

成层饱和砂中输水隧道的地震响应和减震技术研究在城市供水安全保障方面有着十分重要的应用价值。本项目拟采用理论分析的研究手段，针对成层饱和砂中输水隧道的抗震问题展开研究工作。一方面，建立成层饱和砂中输水隧洞的地震响应研究模型，采用波动解法得到模型的波动场及隧洞的地震响应，进而分析各种因素对输水隧洞地震响应的影响程度，获得成层饱和砂中输水隧洞的地震灾变机理和规律。另一方面，分别建立采取了泡沫混凝土隔震层和围岩注浆加固等减震隔震技术手段的成层饱和砂中输水隧洞动力分析模型，研究各种减震隔震技术对输水隧洞地震响应的影响，揭示各种减震隔震技术在成层饱和砂中输水隧洞减震中的作用机理，从而提出适用于成层饱和砂中输水隧洞减震的技术手段。通过课题的研究，可以揭示出成层饱和砂中输水隧洞的地震破坏机理以及多种减震隔震技术的减震效应，为输水隧洞的抗震设计和抗震加固提供一定的理论参考。

成层饱和砂中输水隧道的地震响应和减震技术研究在城市供水安全保障方面有着十分重要的应用价值。本项目采用理论分析的研究手段，研究了成层饱和砂中输水隧道的地震响应和减隔震层的隔震效应。首先，采用波动解法分析了各种因素对输水隧洞地震响应的影响程度，获得了成层饱和砂中输水隧洞的地震灾变机理和规律。其次，研究了泡沫混凝土隔震层和围岩注浆加固层对输水隧洞地震响应的影响。研究表明：隧洞内部充水状态的改变对衬砌位移和加速度响应的影响较小，但引起衬砌应力产生较大变化，在满水状态时应力最大；选择围岩等级较高的地层进行隧洞建设，可以提升隧洞抵御地震作用的能力；随着衬砌混凝土强度等级的提高，输水隧洞衬砌的动位移响应和动加速度响应变化不大，但动应力变化极为突出；减震层的设置对隧道衬砌的应力能起到降低的作用，而且注浆层的减震效果比泡沫混凝土减震层要好；减震层的厚度变化或者刚度变化对满水隧道和空隧的减震效果都有很大影响。研究成果为输水隧洞的抗震设计和抗震加固提供一定的理论参考。项目资助发表核心论文5篇，待发表2篇。