摘要
基于岩体开挖卸荷过程中力学参数变化理论,建立卸荷岩体有限元分析模型,运用ADINA有限元分析软件对岩体进行三维卸荷数值仿真研究。结果表明,岩体在开挖卸荷过程中,岩体的弹性模量、粘聚力和内摩擦角等力学参数随开挖卸荷量的增大而减小,但不是从初始值一直减小到零,而是随岩体的裂隙、结构面张开扩展到一定程度后,保持一定的量级不再减小。
The finite element analysis model for unloading rock mass is set up based on the changing theory of mechanical parameters during the excavation and unloading of rock mass, and the three-dimensional numerical simulation for the model is conducted by ADINA. The simulations show that the elastic modulus, cohesion and internal friction angle of rock will reduce with the increase of excavation quantity, but not reduces to zero from initial value and will keep in a certain order of magnitude when the rock cracks and structure surface extends to a certain degree.
出处
《水力发电》
北大核心
2011年第4期31-34,共4页
Water Power
关键词
有限元
岩体开挖
卸荷过程
力学特性
finite element
rock excavation
unloading process
mechanical characteristic
