高应力巷道底板破裂形态特征研究

Research on fracture shape of high stress roadway floor

为了研究深部高应力巷道底板破裂形态及剪切带的发育规律,采用试验、理论分析、数值计算和现场测试等方法,建立一种岩石应变软化模型,对岩石压缩变形破坏过程中剪切带的形成机制进行研究,模拟与试验的峰值应力、残余强度误差在10%~20%,模型能够较好地体现岩石峰后的应变软化力学特征;基于该应变软化本构关系,建立高应力巷道围岩应变局部化分析的数值模型,系统分析了高应力巷道底板剪切带发育规律及破裂形态。巷道钻孔窥视结果表明,深部高应力巷道底板会形成局部破裂与变形,模拟研究结果与实际巷道底板破坏形态相符。

In order to study the rupture form of the high stress roadway floor and the development law of the shear zone,research methods such as laboratory experiments,theoretical analysis,numerical calculation,and field test were comprehensively adopted.By establishing a strain softening model of rock,the formation mechanism of shear zone in the process of rock compression deformation and failure was studied.The error of peak stress and residual strength between the simulation and the laboratory test was from 10%to 20%,and the model can well reflect the mechanical characteristics of strain softening after peak;based on this strain softening constitutive relationship,a numerical model for strain localization analysis of the surrounding rock of high stress roadway was established,and the development law and fracture shape of the shear zone of high stress roadway floor were systematically analyzed.The results of borehole peek show that the deep high stress roadway floor will form local fracture and deformation,and the simulation research results are consistent with the actual roadway floor failure shape.