施工期大型地下洞室群快速反馈分析方法及应用

Rapid Feedback Analysis Method and Its Application for Underground Caverns During Construction

基于工程地质构造特征和监控测量数据,选用弹塑性有限差分计算方法进行正计算,采用区间分析优化和正交试验设计方法,建立了区间正交反馈分析优化模型和技术路线。在工程实践中,通过针对性的实验方案设计和正演计算分析,取得最优模型参数值,应用最优参数通过正演计算对后续工程问题进行预演分析。针对后续施工过程中可能存在的问题,提前采取适当的施工方法和加固措施。通过对某大型地下水电站洞室群施工过程的仿真模拟和反馈分析,验证该方法的可行性和优越性,同时对工程建设过程中的稳定性问题进行了定量和定性分析,以优化设计和施工方案。

Based on the geological structure features and monitoring data in the actual project, elastoplastic finite- difference calculation method was selected for the direct approach. New feedback analysis optimization model and technology roadmap for huge underground caverns were established by using interval analysis optimization and orthogonal design method. In engineering practice, optimal model parameters obtained by pointed design of the program and properly direct approach analysis will be used for predictive analysis in the following projects. Then the problems that may exist in the following construction process will be forecast so that appropriate construction meth- ods and reinforcement measures will be taken in advance. In this paper,simulation and feedback analysis of the con- struction process in a large underground hydropower caverns were carried out to verify the feasibility and advantages of the method. In addition, the stability problems in the construction process were also discussed quantitatively and qualitatively in order to optimize the design and construction methods.