摘要
瀑布沟水电站地下厂房赋存于复杂的地质环境中,厂房开挖过程中岩爆活动频繁。为分析围岩应力对岩爆活动的影响,研究初始地应力理论和计算方法,对厂房区域的地应力实测值进行线性回归,并在ANSYS中实现初始地应力的加载,得到与实际勘测结果相接近的初始地应力场。在此基础上,对地下厂房的开挖过程进行三维有限元数值模拟,根据岩爆判别准则对岩爆危险区域进行预测,并给出危险等级分类。岩爆模拟结果和现场监测结果基本吻合。研究结果表明,瀑布沟水电站地下厂房围岩区域的构造应力显著,且具有较强的方向性。地下厂房围岩整体上稳定,拱脚、洞室交口处围岩容易发生高等级岩爆。
The underground powerhouse of Pubugou Hydropower Station is located in the complex geological environments.Rockburst happens frequently during the excavation of powerhouse.The initial stress and its computing method are studied to analyze the effect of surrounding rock stress on rockburst.The linear regression is adopted to test the geostress of powerhouse.The loading of initial geostress is accomplished in ANSYS;and the initial geostress field close to the actually measured one is obtained.3D finite element numerical simulation is conducted for the excavation of underground powerhouse.According to the rockburst discrimination criteria,the dangerous region where rockburst is apt to happen is predicted;and the dangerous degree is classified.The prediction result of rockburst almost accords with the monitoring one in field.The study results show that the geostress of the underground powerhouse in the Pubugou Hydropower Station is prominent and has stronger directional property.The surrounding rock in the underground powerhouse is stable in the whole.High-level rockburst is easy to happen at the arch springing and intersection of caverns.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第A01期2894-2900,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2002CB412707)
关键词
岩石力学
岩爆
应力判据
初始地应力
有限元
rock mechanics
rockburst
discrimination criterion of stress
initial geostress
finite element
