Case study on long-term ground settlement of reclamation project on clay deposits in Nansha of China

Abstract

In the design of reclamation, long-term settlement is seriously concerned. This paper presents a case study on the ground settlement of a reclamation project in Nansha, China. Fourteen undisturbed soil samples were taken at different depths from this site. Both oedometer tests on fourteen specimens and triaxial hydraulic conductivity tests on nine specimens were conducted. Finite element (FE) modellings using soft soil creep (SSC) model or soft soil (SS) model for modelling clayey soils with or without creep and the calculation using a new simplified method were performed to analyze the consolidation settlement of clay deposits subjected to filled loadings. The FE simulated results and calculated results from the new simplified method were compared with the monitored data in the field. Results show that the curves of the FE modelling using SSC model and the calculation from new simplified method have the same trends as those of the measured settlements. The creep contributes to excess pore pressure dissipation during the consolidation. Furthermore, ground settlements of the reclamation are predicted with the aid of the FE and new simplified method analysis. These predictions can provide the essential information for engineers to control or reduce the settlement in future.

Multi-Stage and Multi-Parameter Influence Analysis of Deep Foundation Pit Excavation on Surrounding Environment

“…During the construction of deep foundation pits in high-rise buildings and other projects, the supporting structure interacts with the soil to adjust their stress and deformation stably so that the soil inside and outside the foundation pit is stable or unstable. This is a physical process with complex mechanisms [14][15][16][17][18][19][20]. The higher the degree of urbanization, the more complex the adjacent buildings in cities, such as adjacent high-rise buildings, viaducts, subway stations, underground pipe networks, etc.…”

Effect of Bound Water Content on Secondary Compression of Three Marine Silty Clays

“…Marine silty clays usually have particularly high water contents and high void ratios due to their special mineral and granular composition and, therefore, present with high compressibility, low bearing capacity and prominent creep behavior. With the rapid development of the economy and construction in coastal cities around the world, post-construction settlement assessment, underground space design [9] and reclamation projects [10][11][12] have become important topics in the areas of marine silty clays. In this context, a compression study on marine silty clays is critical for providing theoretical evidence for reclamation planning and environmental impact assessment.…”

An experimental investigation of the influence of plasticity on creep degradation rate

“…However, C ae increases rapidly as the yield/preconsolidation pressure is approached; it reaches its maximum at the yield/preconsolidation pressure and decreases under higher stresses. There is also evidence that C ae either increases with the effective stress until the yield/ preconsolidation pressure and remains constant thereafter [18,33] or increases almost linearly with increasing effective stress [21]. Additionally, there have been some studies on the influence of the physical properties on the C ae [1,53,58,70,77,81].…”