非对称荷载作用下圆形洞室塑性区边界的近似计算  

Approximate calculation for plastic zone boundary of circular cavity under the asymmetric load

作　　者：李宇翔[1] 彭永久 林全坤[1] 韦轶[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]湖北省荆门市东宝区公路管理局,湖北荆门448000

出　　处：《公路工程》2012年第4期128-131,共4页Highway Engineering

摘　　要：考虑到隧道围岩塑性区的边界受到中间主应力的影响,通过对Morh-Coulomb和Drucker-Prager两个屈服准则在工程中的运用比较,结果表明在运用Drucker-Prager计算塑性区边界时围岩塑性区增大,证明中间主应力对塑性区有影响。该理论弥补了Morh-Coulomb理论未考虑中主应力对塑性区范围的影响,为工程实践提供更加安全的计算理论。Considering the effect of border of plastic zone surrounding rock in tunnel by the intermediate principal stress. Through comparison between Morh-Coulomb and Drucker-Prager which are two yield criterions in the engineering project. The results show that using the Drucker-Prager calculation for plastic zone boundaries enlarging the surrounding rock mass, which proved the intermediate principal stress has the influence on the plastic zone. This theory to make up for the Morh-Coulomb which did not take the influence for range of plastic zone by the intermediate principal stress into account, and providing more secure computing theory of the engineering practice.

关 键 词：Morh-colomb DRUCKER-PRAGER 中间主应力 塑性区 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]