| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災技術研究所 === 90 === Low pressure grouting has been used to improve the soil condition. Since the complex nature of soil properties, the quality and quality control are likely beyond expectation. Therefore, an indoor grouting facility is established and grouting simulation can be conducted inside the chamber. This will help us to examine the grouting results and study the mechanism. In a long run, this procedure can be used to adjust the grouting work plan.
All related information of low pressure grouting and indoor grouting are studies, constant head permeability feeling and sand raining testing are conducted to establish the relation of permeability and void ratio, and also set up the raining procedure and grouting procedure. In addition, pore pressure monitoring system is installed inside the chamber; this will help to trace the grouting nature and analysis. After the soil sample is made of raining procedure, water pumping is adopted to explore the permeable nature of sample, and then the bentonite grout is pump next. By excavation the results of grouting can be examined with eyes, the grouting record and excess pore water pressure records are analyzed to study the influence from the soil preparation, pumping pressure and pumping rate.
In this study, bentonite grout initiates the fracturing grouting. The other similar researches from literature also show the fracture nature from suspension grout. Vertical stress is bigger than horizontal stress is valid in normally consolidated soil, so that the grouting results show a series of vertical fracturing planes.
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