An experimental and numerical study on strengthening collapsible loess foundation with plain soil compaction pile

The bored compaction pile is one of the most effective methods to treat collapsible loess foundation and improve its bearing capacity. The collapsible loess foundation of a proposed project is treated by a plain soil compaction pile, and the field load test is carried out. The test includes different pile length conditions and different pile spacing conditions. Based on settlement displacement and compaction coefficient, the foundation treatment effect is evaluated, and the settlement displacement is verified by numerical simulation. The results show that when the pile spacing is the same, the longer the pile length, the longer the soil reinforcement area, and the smaller the displacement and settlement. The reduction of pile spacing can effectively improve the bearing capacity of the foundation, and the longer the pile length, the more obvious the effect of improving the bearing capacity of the foundation.