摘要
基于开挖与支护计算的有限元数值格式,研究了开挖释放荷载及支护效应动态仿真计算方法,根据围岩塑性系数分布规律,提出了用于动态模拟支护效应的荷载分配系数确定算式。结果表明,将开挖问题转化为简单的加载问题可实现开挖过程的连续追踪模拟。通过荷载分配及迭代分步能合理地实现施工开挖过程动态模拟,且能较好反映锚固支护效应的影响。
Based on numerical format of finite element method（FEM） for calculation excavation and support,dynamic simulated calculation method is proposed to study excavation releasing load and support effect.On the basis of plastic coefficient distribution of the surrounding rock,load distribution coefficient is obtained,which is applied to simulate support effect dynamically.The results show that the excavation problem can be converted to simple loading and it realizes sequential trace simulation of excavation process.The further illustrated case proves that it can reasonably simulate excavation process and reflect the influence of anchorage support effect by using loading distribution and iterative method.
出处
《水电能源科学》
北大核心
2010年第12期98-100,共3页
Water Resources and Power
关键词
地下结构
开挖
支护
有限单元法
数值模拟
underground structure
excavation
support
finite element method
numerical simulation
