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分析了水射流土层扩孔参数,建立了射流参数与土体参数的关系.通过实验,研究了射流参数和钻杆运动参数对扩孔效果的影响.结果表明:提高扩孔效果必须增大射流功率,在射流作用力大于土体临界破坏力的条件下,增大射流流量比增大射流压力更加有效;合理地匹配钻杆运动参数更有利于扩孔效果的提高.工程应用证明,运用水射流扩孔技术制作多环扩孔型锚杆是可行的,锚杆承载力明显提高.
The relationship between jet parameters and soil parameters was analyzed.The influence of jet parameters and drill rod parameters on the effect of expanding holes was studied.The results show that the effect of expanding the hole must be increased The jet power is more effective when the jet force is greater than the critical destructive force of soil so as to increase the jet flow rate and increase the jet pressure more reasonably. Water jet reaming technology to make multi-ring reaming bolt is feasible, the anchor capacity was significantly improved.