基于DEM-FEM耦合的大型地下硐室群地震响应并行数值方法与软件平台

项目名称： 基于DEM-FEM耦合的大型地下硐室群地震响应并行数值方法与软件平台

项目编号： No.11472292

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 冷先伦

作者单位： 中国科学院武汉岩土力学研究所

项目金额： 88万元

中文摘要： 赋存与大型地下洞室群围岩且与其切割的复杂地质结构是影响其静、动态稳定性的关键因素，基于此本项目采用离散元（DEM）模拟复杂地质结构、采用有限元（FEM）模拟硐室群围岩、采用DEM-FEM耦合单元模拟两种的接触与连接，以此方法研究大型地下洞室群地震破坏机理。在研究岩体与地质结构接触关系的基础上提出连续与非连续的耦合作用机制；在研究接触面变形协调、力平衡、地震波透反射等特性的基础上提出能表述动态特征的DEM-FEM新型耦合单元耦合；在研究DEM和FEM不同求解模式的基础上提出动态负载平衡的任务调度算法和高效、并行的时域求解算法，以此为理论基础，采用面向对象的编程（OOP）技术和MPI并行程序开发技术，研发基于DEM-FEM耦合的大型地下硐室群地震响应的并行数值分析软件平台，并通过经典考题对其验证。以汶川地震中映秀湾水电站大型地下洞室群的典型震害为例，采用本项目开发的软件平台再现其震害发展过程。

中文关键词： DEM-FEM耦合单元；地震响应；并行计算；时域积分；软件平台

英文摘要： The complex geological structure existing around and within the large-scale underground cavern group is the main factor that influences the static and dynamic stability of the cavern group. In the proposal, the discrete element method (DEM) is adopted to simulate the complex geological structure, and the finite element method is adopted to simulate the surrounding rock of the cavern group, while the coupled DEM-FEM method is adopted to simulate the contact and link of the two kinds of media. The method proposed is aimed at discovering the earthquake damage mechanism of the cavern group. The acting mechanism of the continuous and discontinuous parts within the rock is proposed basing on the analysis of the contact of the rock and geological structure, and the coupled DEM-FEM element which represents the dynamic character is proposed basing on the study of the compatibility of deformation, the force equilibrium of forces and the Seismic wave transmission or reflection. By analyzing the solution method's difference between the DEM and FEM, the task schedule algorithm fulfilling the dynamic load balancing and the parallel integration algorithm are proposed. The software platform simulating the seismic response of the large-scale underground cavern group with coupled DEM-FEM method is developed basing on the object oriented programing technology and MPI based parallel programing technology, and the software platform is verified by classic bench mark. The typical seismic damage of the underground cavern group in Yingxiuwan hydro power plant during Wenchuan is taken as test problem, of which the seismic damage developing process is represented by the software platform developed in this proposal.

英文关键词： coupled element of DEM-FEM;seismic response;parallel computing;time domain integral;software platform