基于D-P准则的深埋隧道破碎化分区规律研究

深部洞室开挖因应力重分布而使围岩出现松动区、塑性区、弹性区,基于D-P准则对深埋隧道围岩破碎化分区提出划分准则,利用ANSYS软件分析不同埋深3个区域发展状况并与规范推荐荷载高度进行对比,揭示埋深对松动区、塑性区半径的影响。研究结果表明,Rp,Rc与埋深H近似呈线性关系,与芬纳公式走向基本一致;当埋深超过某一临界埋深时,松动区迅速发展而呈现指数型增长;松动区分布形态及范围随埋深不同而呈现明显差异。

Studies on Fragmentation Zone Distribution Laws of Deep Tunnel Based on Drucker-Prager Yield Criterion

The broken zone, plastic zone and elastic zone appear in the surrounding rock due to the stress redistribution cased by excavation of deep tunnels. The fragmentation zone distribution laws of surrounding rock of deep tunnel are pro- posed on basis of Drucker-Prager yield criterion. The developing situations of 3 zones under different cover depths are analyzed by means of ANSYS and compared with load height recommended in the criterion. Influence of cover depth on radius of broken zone and plastic zone. The study results show that there is a linear relation between Rp, Rc and cover depth H, the trend of Fenner Formula. When the cover depth exceeds a critical depth,the broken zone develops rapidly and presents exponential growth. The distribution and the scope of broken zone the cover depth.