Comparisons of the Concrete Removal Effect by Single & Double Water Jets
The combined crushing technology with multi water jet is the main form of effectively improving the effi-ciency of concrete breaking by hydraulic in engineering.However,current theoretical research on water jet crushing concrete mainly focuses on single water jet.Based on the coupling method of smooth particle SPH hydrodynamics and FEM finite element,a numerical model of single & double water jets impacting concrete is established.The failure process,the depth,width,area and stress evolution characteristics of the failure pit are compared and ana-lyzed.The research results indicate that a single water jet is suitable for single point deep damage because its energy is concentrated.While a double water jet is suitable for large-scale shallow surface damage because its energy is more dispersed;With the same energy,the energy density of a single water jet is more concentrated than that of a double water jet.The impact depth efficiency of the former is 20.99％higher than that of the latter.The impact width efficiency of a double water jet is 32.2％higher than that of a single water jet;In terms of area,the impact failure efficiency of the double water jet is 11.1％higher than that of the single water jet;Stress analysis shows that the stress of a double water jet can be superimposed and amplified,resulting in additional damage and failure compared to a single water jet impacting concrete.This study provides reference for the application of water jet in practical en-gineering.
double water jetconcreteSPH-FEM methoddamage efficiencydamage
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