Abstract:The double hight pressure jet grouting was used to treat the anti-seepage of sand gravel foundation, and the appropriate grouting method and constrution process parameters were selected through the test. During the construction process, these process parameters were strictly controlled to ensure the integrity, continuity and high strength of the anti-seepage wall after grouting. The results of well pumping test and water injection test in borehole show that the anti-seepage performance index of high-pressure rotary jet grouting anti-seepage wall meets the design requirements and achieves the expected treatment effect. The engineering practice has proved that the anti-seepage treatment technology of sand gravel foundation by double pipe high pressure rotary jet grouting is feasible.