针对大粒径地层钻孔工效低、精度差、射流喷射范围小、形成墙体防渗质量差的缺点,研究了射流在大粒径地层内的作用机理,提出不同于细颗粒地层的射流作用方式,得出复杂地层高喷处理的可行性。造型配套国内外先进施工设备,并完成二管法、三管法高喷设备的配套,形成以高压力、大流量高压射浆为特点的高喷施工工法 In view of the low work efficiency, poor precision and small jet injection range of large diameter borehole formation, the imperfection quality of the wall is poor. The mechanism of the jet flow in the large particle size formation is studied and the jet effect different from the fine particle formation is proposed Way, come to the complex formation of high-jet treatment feasibility. Modeling supporting advanced construction equipment at home and abroad, and the completion of two-pipe method, three-pipe high-jet equipment supporting the formation of high pressure, high-pressure high-pressure jet grouting for the characteristics of high-spray construction method