Technical session 2g: Pile foundations (Ⅰ): Piled rafts, bearing capacity, and analysis

摘要

As it has been mentioned the papers submitted for this session span a wide variety of topics. Some of the papers present new developments and some are improvements in their respective area. In the papers submitted in the areas of numerical analysis and analytical methods, new developments and improvements were presented. The methods were validated by back-analysis of model test results and full-scale test results conducted on pile rafts, pile group and single piles. In most cases, the comparison between measured and predicted values indicat good agreement. This shows that significant progress has been made in the area. However, there are issues which still need further clarification. The papers in the area of model-test present investigation results conducted on pile rafts, pile group and single piles using 1g-model test, centrifuge model test and shaking table model tests. Influences of different parameters like pile length, number of piles, pile spacing and diameter of piles on the load-settlement and load sharing behaviors of pile-raft foundations subjected to lateral and vertical loads were investigated by different authors using lg-model tests. The results obtained are very important to understand the performance mechanism and the soil-structure-interaction behavior of pile-raft foundations. In fact all the model tests were conducted in dry sands. This will limit the application of the experimental results to pile-raft foundations in clays or in general other types of soils. The data obtained from the centrifuge model test and shaking table tests are very useful to understand the influences of inertia forces and forces due to lateral spreading on piles in liquefiable soils.