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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。
With the deepening of coal mining, the surrounding rocks of deep high stress roadway show typical strain softening, rupture expansion and rheological characteristics. By establishing a linear softening model and performing viscoelastic-plastic analysis, the stress, displacement and rupture radius of surrounding rock in deep roadway are determined. Taking the tunnel of mudstone section in the bottom of Yongcheng coal mine in Shandong Province as a research background, the deformation and failure characteristics of the surrounding rock under rupture expansion and linear softening are obtained. The results show that both softening and rupture expansion have a significant effect on the surrounding displacement and the thickness of the rupture zone. Under the coupling effect, the deformation and fracture of the surrounding rock are more serious than the single factor, and the linear softening has more influence on the stability of the roadway than the rupture Expand more. Through the field measurement, the result is compared with the theoretical value to verify the correctness of the calculation.