摘要
对TBM斜井围岩应力场和渗流场进行耦合分析,基于统一强度理论对斜井围岩进行弹塑性力学研究,考虑中间主应力、侧压力系数、斜井倾角和渗流作用的影响,推导出TBM斜井衬砌和围岩中应力、位移解析表达式及塑性区半径计算式。结合工程实例计算分析,结果表明考虑中间主应力作用时,围岩自身稳定性得到增强;在二向非等压状态下,围岩侧压力系数、斜井倾角和渗流作用会对围岩塑性区分布和应力大小产生不同程度的影响。研究结果为渗流条件下TBM斜井施工及安全性评价提供了理论依据,具有工程参考意义。
Based on unified strength criterion, coupling analysis of stress field and seepage field is used and the elastic-plastic mechanical analysis of TBM inclined shaft is presented. The analytical solu- tion of stresses, as well as displacements of lining structure, surrounding rocks and plastic radius are de- rived from the consideration of intermediate principal stress, lateral pressure coefficient, inclined shaft angle, and seepage forces. Analytical calculation is conducted based on a project background. The re- sults have shown that the stability of surrounding rocks increases with the intermediate principal stress effects; the plastic radius and stresses of surrounding rocks are differently influenced by lateral pressure coefficient, inclined shaft angle and seepage forces under two-dimension unequal pressure. The research results provide theoretical basis for the construction and safety analysis of TBM inclined shaft, and have reference value to similar projects.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2016年第5期819-826,共8页
Journal of Mining & Safety Engineering
基金
国家自然科学基金重点项目(U1261212)
国家自然科学基金项目(51274209
41472259)
关键词
TBM斜井
中间主应力
侧压力系数
渗流作用
塑性区半径
围岩应力
TBM inclined shaft
intermediate principal stress
lateral pressure coefficient
seepageforces
plastic radius
stresses of surrounding rocks
