摘要
地下工程的特殊地质环境和岩石自身的构造(存在微裂隙)决定了岩石的破坏主要以压剪破坏为主.而地下硐室的破坏如岩爆等也以剪切型破坏为主.剪切型裂纹与张性裂纹的不同使得岩石破坏时释放出较大的能量.岩石破坏过程中自身力学参数的弱化,使得应力应变关系并不能准确反映岩石变形破坏的本质.因此,以能量的耗散和释放原理,分析了岩石变形破坏过程中的能量变化,并以单轴压剪破坏为例研究了岩石破坏过程的各种能量的传递、转化关系,计算了压剪破坏后岩石释放的各种能量所占总变形能的比例,对认识硐室围岩应力重分布后积聚的可释放变形能的能量分配,硐室发生岩爆时动能大小及岩爆的量级,具有一定指导意义.
The special geological environment and the construction of the rock decide that the shear failure is the most common failure mode.And the failure of the underground cavity such as rock burst is also damaged as shear failure.The shear crack is different from the tensile crack in that the rock can release a large amount of energy at the shear failure mode.The weakening of the mechanical parameters in the failure process makes the relationship of the strain-stress can＇t reflect the essence of the deformation and failure.Consequently,research on the deformation and failure process of rock used by energy is important.Based on the theory of energy dissipation and energy release,we study the energy changes and take the uniaxial compression shear failure as an example to study the transmission relationship of the kinds of energy,compute the proportion of the kinds of energy released after the rock failure.The study is significant in realizing the proportion of the kinds of energy after the stress re-distribution and the magnitude of the kinetic energy and the rock burst.
出处
《采矿与安全工程学报》
EI
北大核心
2010年第2期179-184,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(40772173)
国家重点基础研究发展计划(973)项目(2009CB724607)
教育部新世纪优秀人才支持计划项目(NCET-08-0336)
山东省自然科学基金项目(Y2007F52)
关键词
剪切破坏
岩爆
能量耗散
能量释放
shear failure
rock burst
energy dissipation
Energy release
