| Summary: | 碩士 === 國立屏東科技大學 === 土木工程系碩士班 === 93 === The main objective of this study is to investigate the bearing capacity characteristics of reversed circulation piles in mudstones . Different varieties of information related to administrative zones, geological formation, meteorological and hydrogeological data, soil classification, land use capability, high speed rail corridor, mudstone properties, group piles construction and their load test in situ, have been categorized and classified into two main sections, i.e. under natural environment and construction environment. This information will serve as reference for subsequent regional environment analysis. Based on the principle governing the design of reversed circulation pile and the characteristic analysis of its bearing capacity, it is used in the estimation and analysis for piles bearing capacity.
Soil condition surrounding the pile and the dead load of the pile contribute to the bearing capacity of the pile. This study deals specifically with the different loading on the piles in different soil conditions, together with bearing capacity of the soil strata at different depth, to produce a comparison analysis. From this study, it is concluded that the bearing capacity of pile is highest when the pile toe embedded into sandstone or sandy soil, moderate in mudstone and least in clayey or sedimentary layer. It also reveals that contribution of the bearing capacity from the pile toe embedded in mudstone is low compared to the total weight of the pile; hence, it is not used for end bearing pile design. Additionally, this study further reveals that during reversed circulation piles construction, it is important to pay particular attention on the removal of the sediments under the piles and the duration of the pile construction; this will affect the bearing capacity of the piles in the mudstone strata.
In order to overcome the problems of mudstone strata complexity and construction difficulty, the actual soil strata and analysis data, precise pile locations, accurate determination of the bearing capacity of the soil strata, surrounding piles design and stringent construction management are necessary and need to be investigated during piles design stage. This will ensure good quality, economical, safe and durable piles constructed in mudstone area.
|
|---|
