Analysis of Slurry Diffusion Mechanism of the Splitting Grouted in Dam Reinforcement

Abstract

The reinforcement of disease dam in China is one urgent problem to be solved. Because the rivers and lakes in south of China are quite a lot, and many dams have been built in these rivers and lakes for power station and farmland irrigation in the 1960s or 1970s. Those dams are being “ill” because the building technology at that time is under-developed which causes those dams mostly to be being “ill”. With the increase of dam operation time, the majority of disease dams have been becoming seriously and have to be reinforced to extend the operation time. As one techology of dam reinforcement methods for environmental protection and save material, the splitting grouted has been created firstly and used in many dam reinforcements in China. With this technology, a certain amount of grouting pressure is applied at the dam axis to control the split dam body at first; after that, an appropriate amount of seriflux is injected into the dam body to fill the holes and crannies in the dam body, and form an effective anti-seepage solid bodies, thus improving the stress state of dam body and achieving the consolidating the dam structure. In the reinforcement technology, the slurry has been filled inside dam body, the slurry diffusion mechanism is the important for studying the working principle of splitting grouted. So, based on the numerical simulation, the slurry diffusion law has been simulated to investigate the mechanism of slurry diffusion. At the same time, the deformation of dam during the splitting grouted has been comparative demonstration. Through those numerical calculation, it can be founded that the strength of dam is improved and cracks are filled which because the splitting slurry has been diffusing from grouting port to dam body, and the dam has been moving to both sides of dam body. Those would lead to fill the fractures in dam body and form the impervious wall along the grouted ports.