岩体中封闭爆炸破碎区尺寸参数的近似计算方法

为了进一步研究岩石中爆炸近区的变形性状,依据经典的强度破坏准则将岩石中爆炸近区分为破碎区、径向裂缝区和弹性区。应用正确的爆炸近区运动学关系式,研究了岩石中爆炸作用下各个变形区的发展,着重分析了破碎区尺寸参数与岩石介质特性参数的变化关系。利用各个变形区及与爆炸腔室之间的边界条件和裂缝增长的能量准则,获得破碎区尺寸参数的近似计算方法。结果表明,爆炸腔半径与破碎区半径在较短的时间内单调增至最大值,而后保持不变。为岩石中爆炸问题的相关研究打下基础。

Analysis of crush zone size in rock mass under explosion load

The zones near the cavity of explosion were categorized into crushing zone,radial crack zone and elastic zone based on classical failure rules.The development of these zones was studied with the correct kinetics formula near the cavity of explosion.The relation between the characteristic parameters of the separate zones and the rock was analyzed especially.The calculation results show that the radio of explosion cavity and the crush zone increase to maximum monotonously in short time and hold them on.An approximate method,which can gain crush zone size in the separate zones of deformation in rock under explosion load,was attained based on the boundary conditions of the zones,the cavity and the energy rule of growing rock cracks.