盾构隧道渗水引发的结构性软土三维耦合固结理论与试验研究

本项目以盾构隧道渗水引发周围结构性软土长期固结沉降为研究背景，首先基于多孔介质三维固结理论，并考虑水位变化情况，建立盾构隧道渗水条件下隧道周围软土三维耦合固结解析理论；其次结合半解析法编程、有限元数值模拟和二次开发以及多物理场仿真计算，系统地研究结构性软土在隧道渗水条件下超静孔压和变形的发展规律，揭示隧道周围软土长期沉降发展机理和影响因素；然后通过进行超重力离心机模型试验及现场实测，探明渗流与变形的耦合机制及渗流场分布情况，为解析理论和数值计算提供验证。最终形成一套系统研究软土隧道长期沉降的理论和数值计算方法。

The research background of this project is the long-term settlement of the surrounding structured soft soil induced by leakage of shield tunnel. Firstly, based on three-dimensional Biot’s coupled consolidation theory and considering the change of water level, the analytical theory of three-dimensional coupled consolidation of soft soil around the tunnel under the condition of leakage of shield tunnel is established. Secondly, combining with semi-analytical method, finite element numerical simulation and second development, and multi-physics field simulation calculation, the development law of excess pore pressure and deformation is studied systematically, and reveals the long-term settlement development mechanism and influencing factors. Then, through hypergravity centrifuge model test and field measurement, the coupling mechanism of seepage and deformation and the distribution of seepage field are explored, which provide verification for analytical theory and numerical calculation. Finally, a set of systematic theoretical and numerical calculation methods for the study of long-term settlement of soft soil with tunnel are developed.