预制螺旋切槽尖端应力场研究

Stress Field at a Tip of a Prefabricated Spiral V-Notch

在研究传统切槽爆破的基础上,提出用螺旋切槽爆破方法进行土石方的松动爆破· 用断裂力学理论和Westergaard方法,确定了复变应力函数,推导出螺旋切槽在准静态压力作用下的裂纹尖端平面应力、应变场· 定义了螺旋切槽孔松动爆破的应力强度因子表达式,能较好地反映螺旋切槽孔的断裂力学性能,是竖直V型切槽爆破。

Based on the tranditional V_notched blasting,a technique of spirally V_notched blasting to loosen earth and rock was presented.Fracture mechanics and Westergaard stress function were adopted to build a complex stress function to derive the plane stress and strain fields at one tip of the crack under a quasi_static pressure.An expression was formulated to define the stress intensity factor of spiral V_notch loosen blasting.Factors that have effects on the stress intensity factor were studied.It is demonstrated that spiral V_notch loosen blasting is an extension of vertical V_notch blasting,straight cracking,and alike theories.