摘要
层状岩体的物理力学特性沿层面和层面法向各异,为明显的各向异性,其破坏形式和破坏机理与一般岩体也不同。本文根据层状岩体的物理力学性质分析了其破坏特性及其迭代计算方法,推导了损伤状态应力表达式和损伤刚度修正表达式,改进了三维非线性层状各向异性弹塑性损伤有限元数值计算方法并运用于工程实例中。计算分析了岩层倾角对洞室围岩稳定的影响,对各种岩层倾角方案的位移、破坏体积、破坏类型和能量耗散等指标进行对比分析和综合评价,结合工程经验,得出层状岩体中地下洞室的合理布置方式。分析结果与工程实际相吻合。
The failure characteristics and the calculation method of layered rock were expounded according to the anisotropic physical and mechanical characteristics of rock. The computational formulas for stress and stiffness in rock mass damaged state were deduced. By using 3-D nonlinear anisotropic elastic-plastic finite element method, the influence of rock inclination angle on surrounding rock stability of underground cavern in a hydroelectric power station was analyzed. Some indexes for scheme comparison and comprehensive assessment such as displacement, failure volume, damaged modes and energy dissipation for various schemes were calculated and the reasonable layout of underground caverns was proposed accordingly. The result is in accordance with engineering practice.
出处
《水利学报》
EI
CSCD
北大核心
2009年第7期798-804,共7页
Journal of Hydraulic Engineering
基金
国家自然科学基金重大研究计划支撑项目(90715042)
国家杰出青年科学基金(50725931)
国家科技支撑计划项目(2008BAB29B01)
关键词
层状岩体
各向异性
破坏模式
数值模拟
岩层倾角
围岩稳定
Anisotropy
Caves
Computer simulation
Computer simulation languages
Convergence of numerical methods
Energy dissipation
Failure analysis
Hydroelectric power
Hydroelectric power plants
Rock bolting
Rock mechanics
Safety engineering
Underground structures
