Study on the ground mechanics index of deep soft foundation sections in the Dongting Lake region

Abstract

Due to its special geographical location, the Dongting Lake Plain has formed a unique Dongting Lake phase deep soft ground layer. In order to investigate its stratigraphic mechanical index, a research was carried out using pile foundation static load test and pile body stress test based on a trans-Dongting Lake high speed project. The results of the study show that the ultimate bearing capacity of the test piles in this project is greater than the ultimate bearing capacity of the piles proposed by the design, and the reasons for this deviation according to the pile stress test are mainly due to the clay layer, silty powder clay layer and the side friction resistance of the fine gravel layer at the end of the pile are significantly greater than the recommended value of the ground investigation data, while the side friction resistance of the fine sand layer, powder fine sand layer and gravel sand layer is basically the same as the recommended value of the ground investigation data, This can be used as a reference for similar projects in the future.