摘要
通过3D有限元数值模拟,在分析某深埋隧道煤系地层隧道开挖、初期支护和二次支护动态施工过程的基础上,重点分析了下卧煤层(倾角α=35°,厚度h=2.8m)按全陷落法分段开采后隧道支护结构的位移、应力特征,得到了下卧煤层经济安全的禁采深度。为复杂地质条件下煤系地层隧道建设和合理开采矿产资源提供了科学依据。
Dynamic construction process which consists of excavation, primary lining and secondary lining of deep buried tunnel （depth above the crown of tunnel about 490 m） was analysed in coal measures strata by 3D FEM numerical simulation. Characteristics of the tunnel support structural displacement and stress changes were analysed emphatically when underlying coal bed （dip angle α =30°, thickness h=2.8 m） was exploited according to sub-level and full collapse method. Economic and safe prohibiting exploited depth of underlying coal bed is presented. So that a scientific basis for tunnel construction of coal measures strata and reasonable exploiting mineral resources in complex geological conditions is offered.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第9期1448-1451,1455,共5页
Rock and Soil Mechanics
基金
国家自然科学基金重点项目(No.50334060)。
关键词
下卧煤层
开采
深埋隧道
数值分析
结构稳定性
underlying coal bed
exploitation
deep buried tunnel
numerical analysis
structural stability
