Studies On The Anti-liquefaction Behavior Of The Loess Ground Improved By Several Methods

The anti-liquefaction behavior of loess ground improved by gravel columns is studied by 2D finite element method. It shows that the effect of gravel columns on anti-liquefaction is obvious, but the improved area is quite limited even increasing the diameters of the gravel columns because of the low permeability of loess.An explosion test was carried out on an artificially saturated loess ground. Acceleration and pore water pressure data are collected.A lab simulation experiment of explosion test on artificially saturated loess and its numerical analysis are made. By comparison, it is seen that the pore pressure ratio and strain by lab simulation and numerical analysis are very close to those obtained by explosion test. Meanwhile, the effects of load types, load strength and frequencies of the uniform cyclic load and the field explosion load on the test results are of importance.Liquefaction behavior of the loess ground improved by dynamic tamping, chemical grouting, compaction pile, replacement and pre-immersion methods are synthetically studied by field tests and lab dynamical experiments. It shows that only chemical grouting can completely eliminate liquefaction potential in loess and strengthen the loess capability of anti-deformation, meanwhile it can reduce seismic settlement and subsidence due to wetting of loess ground and improve the bearing capacity of loess ground.