Waterjet ground-breaking mechanism 3.1 Factors affect ground-breaking effect of the water jet. Water and gas injection is coaxial jet grouting pile sealing curtain, high pressure water jet crushing effect of the soil and water jet outlet pressure, injection speed, nozzle diameter, nozzle shape and other factors; and the air jet speed, direction and flow size, etc. factors; and by factors broken soil density, particle size and size distribution, shear strength and so on. As the injection pressure increases, the effective spray distance increases, but the flow of the jet stream has a greater impact on the water jet pressure. Water jet exit velocity increased pressure rotating pile seal curtain, increased energy carried by ground-breaking effect increased. Greater velocity air jets, high-pressure water jet velocity decay, the smaller cement mixing Pile Cofferdam, air jet flow increases, the proliferation of the water jet is reduced, increasing the effective distance jet, can achieve better ground-breaking effects, thus pile diameter increases. 3.2 waterjet damaging effects on soil. Water jet ground-breaking results, with the physical and mechanical properties of the soil medium varies. When the initial injection, damaged the soil in three-pressed state water jet impingement point tables, soil by water jet punching dented deformation. JET surface and in the soil, it will generate two forces: one from the nozzle close at JET in which the plot is small, the pressure is much greater than the weight of soil stress, and thus in the soil to produce less of a shear force; one in the more distant from the nozzle, the jet pressure can not destroy the soil occurred, but can be compacted soil and squeeze the liquid portion of the jet in the soil, resulting in a squeezing pressure in the soil. For non-cohesive soil, infiltration dominant; for clay soil sealing curtain, compaction play a major role. When the water jet is moved into between soil particles, soil after being cut and destroyed. Due to the unevenness of the soil, water jet generating first into the large pores lateral squeezing pressure to crack boundary chunk of soil is washed down, tumbling to less pressure at the jet stopped. Therefore, where the jet pressure is small clods will not damage occurs because of this is the existence of massive soil injection pile body. XPL-50 Anchor Drill Rig Jet The main purpose of this model can be used for all kinds of soft ground reinforcement, high-rise building basement seepage treatment, rivers dam remediation, rail road bridge pier reinforcement. By combining different modules for fixed spray can, put spray, jet grouting and other construction technology; Single, double, triple Churning various construction requirements.