原岩应力对圆形硐室围岩塑性区的影响分析  

Influence Analysis of In-situ Stress on Plastic Zone of Circular Chamber Surrounding Rock

作　　者：叶金胜[1] 经来旺 朱玉飞 陈思羽 周建[1] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学力学与光电物理学院,安徽淮南232001

出　　处：《煤矿安全》2017年第9期204-207,共4页Safety in Coal Mines

摘　　要：为了探究原岩应力对塑性区应力的影响,采用SMP(Spatially Mobilized Plane)屈服准则对轴对称的圆形硐室进行理论分析,利用硐室周边和硐室围岩弹塑性交界处的应力边界条件,分别得到了塑性区的应力和硐室的支护力与原岩应力的关系式;研究表明,硐室围岩塑性区的应力和硐室支护力不仅仅与围岩的力学性质有关而且还与原岩应力有关。通过算例分析了原岩应力对塑性区的应力和硐室支护力的影响,分析结果表明:塑性区的应力会随着原岩应力的增大而增大,并且在不同深度处,沿着硐室围岩深部逐渐增大,并且塑性区的应力和支护力均与原岩应力存在明显的线性关系。In order to investigate the influence of original rock stress on the stress of plastic zone, SMP （Spatially Mobilized plane） criterion is used as elasto-plastic analytical method of circular chamber. Under the conditions that the stress is continuous at the elastic-plastic interface and periphery of chamber, the computational formulae of chamber surrounding rock stress and the supporting force are obtained. The studies show that the plastic stress and support pressure are not only related to the mechanical properties of itself but also in-situ stress. And through numerical examples, we analyzed the influence of original rock stress on the plastic zone stress and the supporting force. It is well worth notice that the stress of the plastic zone increases with the increase of the original rock stress, and increases gradually along the depth of the surrounding rock. Similarly, the results obtained the stress of plastic zone and the support pressure has significant linear relationship with the in-situ stress.

关 键 词：SMP(Spatially Mobilized Plane)屈服准则 原岩应力 圆形硐室 塑性区应力 支护力 

分 类 号：TD315[矿业工程—矿井建设]