洪水、地震、爆炸等自然和人为灾害均会导致建筑结构损坏,甚至倒塌,为解决有限单元法(Finite Element Method,FEM)和离散单元法(Discrete Element Method,DEM)等常用模拟仿真方法难以准确高效地模拟结构大变形及倒塌全过程的问题,采用...洪水、地震、爆炸等自然和人为灾害均会导致建筑结构损坏,甚至倒塌,为解决有限单元法(Finite Element Method,FEM)和离散单元法(Discrete Element Method,DEM)等常用模拟仿真方法难以准确高效地模拟结构大变形及倒塌全过程的问题,采用应用单元法(Applied Element Method,AEM)构建模型,并与FEM、DEM进行了对比,分析了3种方法的适用范围及AEM在洪水、地震、爆炸等灾害中的应用情况。研究结果表明,AEM能够高效且可靠地模拟结构从小变形到倒塌的全过程,具有广阔的应用前景。展开更多
Besides the cross sections of roadways and the tendency and obliquity of roadway axes, the major controlling factors affecting the height of a collapsing roof include the weak lithological structure of surrounding roc...Besides the cross sections of roadways and the tendency and obliquity of roadway axes, the major controlling factors affecting the height of a collapsing roof include the weak lithological structure of surrounding rocks. This thesis analyzes the effect of two single and weak lithological structures of both sides and the roof on the height of a collapsing roof in a deep soft rock road- way. Using the two-dimensional UDEC3.1 software, a numerical structures of both sides of a roadway and of two weak lithological simulation was carried out on the models of weak lithological structures of roof of different depths. We reconstruct the overall processes from a break-away layer, bending, subsidence and the cracking of a collapsing roof. We also illustrate the distribution characteristics of displacement fields in the surrounding rock after the roof collapse in a deep soft rock roadway. The results of our numerical simulations indicate that the form of a roof collapse is side-expanding when the roadway is a weak structure at both sides The height of the roof collapse is related to the lithological combination of the roof when the roadway is a weak structure of the roof.展开更多
文摘洪水、地震、爆炸等自然和人为灾害均会导致建筑结构损坏,甚至倒塌,为解决有限单元法(Finite Element Method,FEM)和离散单元法(Discrete Element Method,DEM)等常用模拟仿真方法难以准确高效地模拟结构大变形及倒塌全过程的问题,采用应用单元法(Applied Element Method,AEM)构建模型,并与FEM、DEM进行了对比,分析了3种方法的适用范围及AEM在洪水、地震、爆炸等灾害中的应用情况。研究结果表明,AEM能够高效且可靠地模拟结构从小变形到倒塌的全过程,具有广阔的应用前景。
基金supported by the National Basic Research Program of China (No2006 CB202200)
文摘Besides the cross sections of roadways and the tendency and obliquity of roadway axes, the major controlling factors affecting the height of a collapsing roof include the weak lithological structure of surrounding rocks. This thesis analyzes the effect of two single and weak lithological structures of both sides and the roof on the height of a collapsing roof in a deep soft rock road- way. Using the two-dimensional UDEC3.1 software, a numerical structures of both sides of a roadway and of two weak lithological simulation was carried out on the models of weak lithological structures of roof of different depths. We reconstruct the overall processes from a break-away layer, bending, subsidence and the cracking of a collapsing roof. We also illustrate the distribution characteristics of displacement fields in the surrounding rock after the roof collapse in a deep soft rock roadway. The results of our numerical simulations indicate that the form of a roof collapse is side-expanding when the roadway is a weak structure at both sides The height of the roof collapse is related to the lithological combination of the roof when the roadway is a weak structure of the roof.
