岩石峰值强度后变形速度特性及其在巷道围岩分区碎裂分析中的应用

Characteristics of deformation rate beyond rock peak strength and their application in analyzing zonal fragmentation in surrounding rocks of roadway

考虑岩石的亚临界和超临界变形.在超临界变形软岩体显示的移动速率较大,将导致类似于动能的增加,随着动能密度到达规定值.一部分具有超临界变形的岩体被假定与主体部分分离.基于此种假设,研究了柱面开口范围内的分区碎裂问题.结果表明:考虑到岩体形成的特点(膨胀、内部摩擦力角),提出岩体区域破碎计算示意图,确定了"假"等高线形成分母为2^(1/2)的几何级数的条件.

Rock deformations are considered as two stages including subcritical deformation and supercritical deformation.At supercritical deformation stage,the displacement velocities of soft rock mass are considerably high,which induces a similar increase in kinetic energy.As the kinetic energy density reaches a specified value,a part of the rock mass with supercritical deformation is assumed to be separated from main rock body.Based on this assumption,this study investigates the zonal fragmentation within fractured area of a cylindrical rock.Considering the characteristics of rock formation(expansion,angle of internal friction),this study presents a calculation graph for rock zonal fragmentation,and defines the conditions for geometric series of artificial contour with a denominator of 2^(1/2).