隧道工程量大面广，地下水涌入、洪水倾灌等灾害事件频发。利用大型充气膜结构封堵隧道是及时控制灾害风险蔓延的有效新方法，但其承载条件和服役环境的复杂性也给结构分析计算带来挑战。本项目采用在非线性分析方面具有独特优势的有限质点法作为基本分析方法，通过理论推导、程序开发和模型试验对隧道防灾用大型充气膜结构展开成形与封堵失效全过程展开深入研究。从高精度点值描述、并行加速分区、流固耦合作用三方面建立充气膜非线性时变系统精细化分析的有限质点法计算模型，进行隧道侧向约束条件下充气膜折叠展开成形和来流动载作用下封堵失效全过程的高效模拟，揭示充气膜结构流固耦合动力响应规律、封堵失效机理及影响因素，开展缩尺模型试验以验证和改进数值模型及算法，通过扩展参数分析提出此类充气膜结构成形设计准则和封堵防御性能优化措施，旨在保障其成形精确、使用可靠，提高充气膜结构计算方法和设计理论水平，为工程应用提供理论指导与技术支撑。

There have been a large number of tunnel projects with a wide range of applications, and they are identified as particularly vulnerable to threats such as groundwater inflow and flood pouring. As a new technique for tunnel threat mitigation, the implementation of large-scale inflatable membrane structures to plug specific locations of the tunnel system in time to minimize the consequences of the propagation of disastrous event is now possible. But there are some challenges in the structure calculation and analysis for the inflatable membranes because of their complex bearing conditions and service environment. This project intends to carry out the research thoroughly on the whole process of unfolding and plugging-failure of large-scale inflatable membrane structures for tunnel disaster prevention via theoretical analysis, program development and experimental investigation. The finite particle method with special advantages in nonlinear analysis will be used as the basic method. A finite-particle-method model for the refined analysis of the nonlinear time-varying inflatable membrane system will be built from the aspects of high-precision point-value description, parallel-calculation partition and fluid-structure interaction (FSI). An efficient whole process simulation of the inflatable membrane for the folding/unfolding under the lateral constraint condition and thereafter dynamic plugging failure under incoming-flow load will be performed. The dynamic response law of the inflatable membrane structure considering FSI, mechanism of plugging failure and related influencing factors will be revealed. A reduced-scale model test of the inflatable membrane structure for tunnel threat mitigation will be conducted to verify the correctness of the numerical model and algorithm as well as to modify the calculation parameters. Extended parameter analysis will be performed to provide deployment-design criteria and plugging optimizations for this type of inflatable membrane structure. This project aims to ensure accurate forming and reliable use of large-scale inflatable membrane structures for tunnel threat mitigation. This research will improve the computation method and design theory of this type of membrane structures, and also provide theoretical guidelines and technological support for their engineering applications.