| High pressure sprinkling grouting technology is one of the methods of soil improvement. Its principle is to chisel pipe with special nozzle in soil lay of appointed depth by drills, then jet slurry or water from the nozzle at the pressure of 20-40MPa and come into being jet grouting destroying soil layer. Among the destroyed soil granules, the thinner wells up from the ground with slurry or water, and the others mix with slurry under the effect of jet's impact force, centrifugal force, gravity and so on, then are further rearranged according to certain ratio of soil and quality, concreting to form consolidation in the soil layer.This paper based on Dayoushan tunnel project, illustrates the high pressure jet grouting pile composite foundation in loess tunnel foundation treatment, treated the reasonable application of the composite foundation bearing capacity, and meet the need of project of high pressure jet grouting pile composite foundation of calculation in design and construction. In design, reasonable selected the pile diameter, the pile length is calculated and the design parameter single pile bearing capacity eigenvalues. In construction work on construction parameters, selection, and puts forward the high pressure jet grouting pile problems that should be paid attention to in the construction. After the loess tunnel after the foundation treatment has been open to traffic, and is running well, explains the high pressure jet grouting pile foundation reinforced loess tunnel obvious effect, of great economic benefits and social benefits, is worth popularizing widely application. characteristics, and indicated weak links to supporting system construction force is ignored.
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