摘要
两河口水电站地下厂房地质条件复杂,属于高地应力区,加之受进、出水口布置的限制,其洞轴线选择是一个难点。笔者采用三维非线性有限元方法,对两河口地下厂房N3°E和N7°W两个轴线方案展开平行分析。模拟加固措施和实际开挖过程,对两个方案的地下厂房洞室群围岩应力应变特征和稳定性进行分析评价。分析表明:与N7°W轴线方案相比,N3°E轴线方案较好的规避了地应力释放,可以显著限制变形和塑性区发展,建议采用N3°E方案。
Geological condition of underground powerhouse is complex in Lianghekou hydropower station,and the place belongs to high stress area. It’s hard to consider both hydraulic characteristics of passageway and stability of surrounding rock when to choose an axial azimuth of the underground powerhouse cavern. Three-dimensional nonlinear finite element is carried out for axis N3°E and N7°W respectively,then the comparison of the stress-strain,the stability of surrounding rock and supporting parameters in the two different axis programs are made. As the analysis shows,compared with N7°W axis scheme,the N3°E axis plan avoids stress release better,which significantly limits the deformation and the development of plastic zone. So the N3°E solution is recommended.
出处
《地下空间与工程学报》
CSCD
北大核心
2016年第1期227-235,共9页
Chinese Journal of Underground Space and Engineering
关键词
地下厂房
纵轴线
围岩
稳定性分析
underground powerhouse
axial azimuth
surrounding rock
stability analysis
