摘要
针对马路坪矿的一种典型软岩巷道,根据其地质条件和力学特性,将巷道围岩分成弹性区、塑性区和破裂区,进行弹塑性力学分析,得到其位移的封闭解析解。采用颗粒流软件PFC2D对软岩巷道开挖后围岩变形破坏规律进行数值模拟,探讨围岩各个关键部位的位移分布特征,研究结果与巷道弹塑性解能很好地吻合,说明基本模型的正确性,进而利用模型模拟支护,分析支护效果随支护时间的变化规律。所得结果可为类似巷道的破裂机制分析和支护设计提供理论指导。
Based on the specific geological condition and mechanical properties of rock, the surrounding rocks of a typical soft tunnel of Maluping mine, were divided into three regions, i. e. the elastic region, the plastic region and the cracked region. The closed-form analytical solutions for the displacement in the three regions were derived by an elastoplastic model. Finally, By means of particle flow software PFC2D deformation failure regularity for soft tunnel after excavation was simulated. The displacement distribution of different parts in surrounding rock in detail was analyzed. The results match those of the elastoplastic analysis well, which proves the correctness of the basic model, And then by means of the model the tunnel after lining was simulated, and the variation law of the lining effect versus the lining time was researched. The relevant results may provide theoretical foundations for the cracked mechanism analysis and reinforcement of the similar tunnels.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第4期1639-1646,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(10872218
50934006)
国家重点基础研究发展计划("973"计划)项目(2010CB732004)
中南大学学位论文创新资助项目(2011ssxt277)
关键词
软岩巷道
弹塑性模型
颗粒流模拟
位移
支护
soft tunnel
elastoplastic model
particle flow simulation
displacement
liner
