Research of limit grouting pressure in compaction grouting

The limit pressure of spherical cavity expansion was solved by the law of conservation, in which the volume change of spherical cavity was balanced with the compression of granular soil and the energy given out from spherical cavity expansion was absorbed by the volume change and shear strain caused in granular soil. The stress-strain-volume change relationships and nonlinear strength behaviors of granular soils under high stresses were described. This method can be used to estimate the resistance of compaction grouting. The analysis shows that the limit pressure is determined by the characteristics of stress-strain-volume change relationships and the strength of granular soil, and has no concern with the pressure of super stratum. The theoretical values agree with the measured values from the field test.