Stress field at a tip of a prefabricated spiral \(V\)-notch. (English) Zbl 1092.74524
Summary: Based on the traditional \(V\)-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.
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