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中文摘要：
利用应力波理论对节理岩体的爆破松动机理进行了探讨,同时利用动力有限元数值模拟方法验证了理论分析结果。研究表明,爆破荷载的加载阶段对岩体的挤压蓄能和快速卸载阶段的弹性回复是岩体产生后续松动位移的根本原因;节理岩体的爆破松动在开挖面的法向表现为岩体的剪切错动,在平行于开挖面方向表现为结构面的张开;拉格朗日坐标下的动力有限元数值方法,如ANSYS/LS-DYNA程序,能够较好地用来模拟节理岩体的爆破松动过程。
英文摘要：
With the theory of stress wave,it discussed mechanism of jointed rock loosing under blasting load.And this was verified by a numerical simulation using the dynamic finite element method.Results show that,compression of blasting load can store strain energy in rocks and quick unloading of the stresses can lead to elastic recovery,which are the essential reason for rock loosing during blast excavation.Blast disturbance can induce rock loosing,typical characteristics are shear moving of rocks in the normal direction of excavation surface and opening of weak planes in the parallel direction.The dynamic finite element method,which adopts Lagrange coordinates,can be used to simulate better the loosing process of jointed rock under blasting load.For example,the program of ANSYS/LS-DYNA is good for this case.
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