Test Research And Calculation Analysis Of Weak Foundation Treatment Of Ash Dam By Sand Drain Preloading Method

Due to high water content,high void ratio,high compressibility,low shear strength,low permeability and low bearing capacity of soft grounds,it is extremely disadvantageous to carry out constructed activities on the soft ground. As a simple and effective method of soft ground treatments,the sand drain preloading method has been widely used in construction projects.This dissertation is based on the treatment of soft foundation of the ash dam in ash storage yard of Guangan Thermal Power station. The key issue to the preloading method of dam which uses the self-weight to preload is the speed of the embankment. The magnitude and velocity of the loading have a strong effect on the consolidation velocity,settlement,bearing capacity of ground,construction period and the stability of dam slope. The Experimental study and numerical analysis are used to research the properties of consolidation settlement and strength increase of soft soils of the dam foundation before and after being treated with sand drain,and then to analyze the stability of the dam slope and finally to determine the best scheme to embankment. This research method could be the references to the design and construction of the future same kind project.The mainly contents are as follows:1. Elaborating the present research and development situations on the sand drain preloading method and consolidation theory of sand drain;2. Analyzing the engineering geologic conditions,the geological genesis of the soft soils and the thickness distribution of the soft soils within the area of the ash...