The research of composite groundsill with CFG and GC piles to resist soil liquefaction

Based on a practical engineering project (in yanjiao), which uses composite foundation with CFG & GC piles to improve the bearing capacity of composite foundation and deal with the soil liquefaction. The composite foundation´s capacity and function mechanism are analyzed in the paper, and test results of the composite foundation are also discussed. These include the test results of the carrying capacity of single CFG or GC pile vertical static load and heavy dynamic penetration test (DPT), the test results of the pile´s quality affected by low stain dynamic test and the test results of standard penetration test (SPT). From the analysis of the test results, we can get The following conclusions: (1) That the engineering project shows that the application of the composite foundation to resisting soil liquefaction is successful, which sets an example for widely application of the composite foundation with CFG and GC piles to treating the soil liquefaction of foundations; (2) The composite foundation with CFG and GC piles has the functions of quickening up the soil´s drainage and consolidation; (3) The dynamic load and the shock absorption function of the piles can increase soil´s density, and thereby abate or clear up soil liquefaction. The test results presented in the paper can be applied1 to the similar projects.