摘要
两体结构是冲击地压和煤与瓦斯突出的基本结构,采用FLAC3D模拟软件中的硬化软化模型,较为全面地探讨了各力学几何参数对两体岩石结构破坏的影响。首先,利用塑性剪切应变等值线图,模拟首次呈现了两体结构冲击失稳过程中的弹性回跳和应变局部化现象。模拟结果表明,强度差异是发生冲击失稳破坏的必要条件,硬体变形模量的增加使其冲击能量减弱。其次,模拟研究了一体两介质和两体结构单轴压缩失稳破坏的区别,发现增加界面强度可以减缓两体结构的冲击性。最后,不同的高度比及高径比的模拟表明,两体岩石结构的冲击失稳只在一定的高径比范围内发生(硬体>0.05,软体>0.5),且在相同的软体高度下,动态破坏时间随高度比的增加而减小,即破坏的突然性增加。
It is known that two-body rock structure, formed by one hard rock and another soft one, is the most basic rock structures of rockburst and coal ＆ gas outburst. It investigated entirely the deformation and failure behavior of two-body rock structure by model of strain hardening ＆ softening （SS） from FLAC3D, which varied with mechanical properties and geometry parameters of the structure. Firstly, the elastic rebound and strain localization was reappeared first time by es_plastic contour from FLAC3D. It also indicated by the simulation that the strength difference is one of the necessary conditions of the burst failure while the modulus increase of hard part decreases the burst energy. Secondly, it distinguished failure pattern of one-body-two-property ＆ two-body-two-property with modeling, which suggests that the strength increase of interface can decreases the burst energy. Finally, it implicated that the burst failure happened only if the ratio of height and radius of rock stay in a proper alteration （for soft part is 0.5, hard part is 0.05）. With simulation of same height of soft part, the burst time of failure deduced with the height ratio of the hard and soft, which indicated a more sudden burst failure.
出处
《采矿与安全工程学报》
EI
北大核心
2012年第6期833-839,共7页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2009CB219603)
国家创新研究群体基金项目(50221402)
华北水利水电学院自主科研项目(201111-001375)
关键词
两体岩石结构
数值模拟
弹性回跳
应变局部化
冲击地压
two-body rock structure
numerical simulation
elastic rebound
strain localization
rockburst
