大断面回采巷道非均匀变形破坏与控制对策

Non-uniform deformation failure and control countermeasures of large section recovery mining in roadway

受特殊围岩结构和复杂采动应力场影响,大断面回采巷道在采掘过程中呈现出非线性力学特征,导致其变形和破坏均呈现出显著非均匀特征,即巷道变形破坏从关键部位开始逐渐扩展,最终导致整个巷道非均匀变形失稳。根据巷道围岩非均匀变形破坏特征,研究其内在力学机制,提出有效的围岩控制对策和支护方案,并进行现场应用,取得了显著工程效果。

Affected by Special surrounding rock structure and complex mining stress field, with non-linear mechanical characteristics in large section recovery roadway mining, the damage and deformation with obviously non-uniform feature,roadway damage starts from the key part and develops, causing non-uniform deformation and instability in the whole roadway. Based on the damage features, the mechanical mechanism was studied to give effective surrounding rock control measures and support plan, with obvious engineering effect.