岩爆问题中岩块弹射速度的数值计算与实验研究

发布时间：2019-02-12 17:57

【摘要】：发生岩爆时,弹射出的岩块携带着大量的动能。为计算破坏块体的弹射速度,首先建立了数值计算的平面模型,利用能量守恒原理和破坏前后模型的应变能差计算出能量释放量,进一步算出岩块的弹射速度;后通过单轴压缩实验,运用高速相机拍摄试件破坏的过程,根据2张照片的时间差和岩块移动的距离,得出岩块的弹射速度。经比较,实验与数值模拟的结果相近,验证了数值方法的合理性。这种较简单的数值方法可为计算岩爆问题中岩块的弹射速度和地下采场发生破坏时能量转移的定量计算提供参考。
[Abstract]:When a rock burst occurs, the ejected rock mass carries a great deal of kinetic energy. In order to calculate the ejection velocity of the failure block, the plane model of numerical calculation is established, the energy release amount is calculated by using the principle of conservation of energy and the strain energy difference of the model before and after the failure, and the ejection velocity of the rock block is further calculated. After the uniaxial compression experiment, the damage process of the specimen was taken by high speed camera. According to the time difference of the two photos and the distance of the rock block moving, the ejection speed of the rock block was obtained. By comparison, the experimental results are close to those of numerical simulation, and the rationality of the numerical method is verified. This simple numerical method can be used to calculate the ejection velocity of rock block and the quantitative calculation of energy transfer during failure of underground stope.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室;四川大学水利水电学院;中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家“973”重点基础研究发展计划资助项目(2010CB732005;2010CB226802;2011CB201201) 国家自然科学基金资助项目(41072242;51079093)
【分类号】：TU452

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