【摘要】 探讨了非连续变形分析方法(DDA)动力学算法中阻尼条件施加方法,并针对具体实际问题采用速度阈值控制的复合阻尼方法提高了计算效率。以某水电工程地下主厂房为例,采用改进后非连续变形分析方法对汶川地震载荷作用下节理围岩和洞室开挖过程中锚杆的锚固作用及对边墙稳定性的影响进行研究,重点对比分析了地震载荷下洞室围岩在有无锚固条件对于拱顶、边墙和节理位移变形位移的影响。研究表明,锚杆的锚固作用对地震载荷和高应力条件下地下厂房开挖过程中洞室围岩的变形和稳定性起着关键性的作用。更多还原

【Abstract】 The damping dynamics algorithm of discontinuous deformation analysis( DDA) was discussed,and the composite damping method with velocity threshold control based on practical problems improved the computational efficiency. The underground powerhouse of a hydropower project was taken as an example,the improved DDA algorithm under Wenchuan seismic loading was used to study the anchoring effect in the process of chamber excavation on the surrounding wall deformation,joint deformation displacement. It is shown that the reinforcement with rockbolts will bring great effects on rock surroundings in controlling deformation,stress distribution and stability.更多还原