软化与膨胀作用下深部巷道围岩黏弹塑性分析

随着煤矿开采的逐渐加深,深部高应力巷道围岩表现出典型的应变软化、破裂膨胀及流变特征.通过建立线性软化模型,进行黏弹塑性力学分析,确定了深部巷道围岩的应力、位移和破裂区半径.以山东省郓城煤矿井底车场泥岩段巷道为研究背景进行实例计算,得出了破裂膨胀和线性软化作用下围岩的变形破坏特征.结果表明:软化和破裂膨胀对巷道的周边位移和破裂区厚度都有显著影响；耦合作用下,围岩的变形和破碎比单因素作用下更加严重；其中线性软化对巷道稳定性的影响比破裂膨胀更大.并通过现场实测,将结果与理论值进行对比,验证了计算的正确性.

Visco-Elastoplastic Analysis on the Deep Underground Roadway Surrounding Rocks Considering Softening and Swelling

With the coal mine excavated deeper gradually,strain softening,swelling fracture and rheology of the rock appear around deep and high stress underground roadways.The stress,displace-ment and radius of cracked region are obtained,after linear softening model is built and visco-elasto-plastic mechanics analysis on the deep underground roadway surrounding rock is done.According to an example based on the research background of the mudstone roadways in the shaft station of Yuncheng coal mine in Shandong province,the failure and deformation character of rocks have been analyzed with the influence of swelling fracture and strain softening.The result shows that both swelling and softening have played an important role on the deformation of roadway and the thickness of cracked region.The deformation and failure under coupled action is more serious than the other situations,and softening ac-tion is more disadvantaged to the stability of surrounding rocks than swelling.After comparing the data from actual measurement with the theoretical value,it proves the correctness of the research.