裂隙岩体地震动力致裂与崩滑的不连续变形模拟分析方法研究

裂隙岩体地震动力致裂与崩滑的数值模拟理论与方法是当前地质灾害防治领域亟待深入研究的重要方向。本项目拟针对裂隙岩体崩滑过程中地震波传播及其动力效应导致震裂的特点，以崩滑全过程的概念模型和不连续变形分析（DDA）方法及其开源程序为基础，以云南鲁甸灾区昭通—巧家二级公路为依托工程，开展崩滑体动力响应的地震动输入机制、岩体震裂的破坏准则与本构关系、接触搜索与方程组求解的高效并行算法研究，开发基于CPU-GPU异构平台的DDA高效并行软件，形成裂隙岩体地震动力致裂与崩滑的DDA高效模拟方法，再现依托工程典型震害的地震动力致裂与崩滑全过程，推动DDA方法在岩体工程地震动力响应分析中的应用，为地震作用下崩滑地质灾害的评价与预测提供技术支持。

Research on numerical method for simulating the shattering-cracking and collapsing-sliding of fractured rock mass induced by earthquake is an urgent topic of the geological hazard prevention and control field. According to the characteristics of the shattering-cracking including the seismic wave propagation in the fractured rock mass and its dynamic effect, based on the full-course conceptual model for the collapsing-sliding and the discontinuous deformation analysis (DDA) method and its open source code, we firstly explore the seismic input and boundary setting methods for dynamic response of the collapsing-sliding model, as well as the failure criterion and constitutive relation considering the shattering-cracking. Secondly, using the OpenMP and CUDA technology, the parallel algorithms for searching contacts and solving equations are achieved, and high parallel computing of the DDA program is developed on the CPU-GPU heterogeneous platforms. Finally, taking the Zhaotong-Qiaojia secondary road in the disaster area caused by the 2014 Yunnan Ludian earthquake as the applicative project, the developed DDA program is used to reproduce the full-course of a typical collapsing-sliding hazard. The expected results can promote the application of DDA on the seismic dynamic response analysis for rock mass engineering, and also can provide technical support for evaluating and forecasting the collapsing-sliding induced by earthquake.