高压水射流螺旋式切槽辅助松动爆破模型

基于水射流独特的切割优势提出了高压水射流螺旋式切槽辅助松动爆破的新方法,实验研究了高压水射流切割煤岩体所形成缝槽的断口形貌并建立了其几何模型.在此基础上,基于断裂力学理论同时结合Westergaard方法,确定了复变函数,进而推导出爆生气体准静态作用下射流螺旋切槽孔的应力场公式,得到了射流螺旋切槽孔缝槽尖端应力强度因子计算公式,并分析了高压水射流切槽辅助松动爆破松动效应.最后,采用ANSYS/LS-DYNA数值模拟软件对该模型进行了验证,结果符合较好.

Model of Loosen Blasting Assisted by High-Pressure Water Jet Spiral-Notch

A new technology of loosen blasting assisted by high-pressure water jet spiral-notch was put forward based on its unique advantages of water jet cutting， and the geometric model for water jet notched boreholes was established based on experiments. Furthermore， by employing fracture mechanics and Westergaard stress function method， the functions of complex variables was confirmed， and the stress field acted upon the spirally water jet notching borehole by quasi-static explosion gas was derived. The stress intensity factor of spiral-notch boreholes with high-pressure water jet was determined， and the loosening effect of loosen blasting assisted by high-pressure water jet spiral-notch was also analyzed. Finally， ANSYS/LS-DYNA was applied to verify the theoretical model， and the results of the numerical simulation are almost comparable to the model.