Abstract: In order to address deficiencies of existing forcible entry tools in cutting performance and applicability as cutting is one of the effective ways for emergency rescue, study was conducted on influence degree of pre-mixed AWJ on demolition and cutting of concrete, and an optimized method was proposed. Then, effects of process parameters such as jet pressure, traverse speed, impact angle, and target distance on cutting performance were studied mainly by single-factor experiments and orthogonal experiments. Finally, a prediction model of cutting depth was obtained through multiple linear regression analysis. The results show that cutting depth varies significantly due to influence of different parameters. It increases along with the increase of jet pressure, decrease with that of traverse speed while increase and then decreases in that case of target distance with the optimal target distance at 4mm. As impact angle fluctuates, the optimal impact angle is 80°. And these parameters rank as jet pressure, traverse speed, target distance according to their influence degree from big to small on cutting depth.

Key words: forcible entry device, abrasive water jet (AWJ), cutting depth, prediction model, multiple linear regression analysis, orthogonal experiment