Study of Large Scale Top-Down Construction
A very complex means of interaction between the earth-retaining structure and soil, the top-down method of underground construction can be often simplified as a kind of two-dimensional plane strain in the normal practices of deep excavation design, while commonly involved in the analysis of excavation projects would be such programs as the WALL, RIDO, FREW, FLAC and PLAXIS, and among these, the most frequently applied program would be RIDO. RIDO represents a kind of one-dimensional analysis program based on both the Winkler Model and the elastoplastic balance theory that not only features the advantages of easy enter and fast operation, but also demonstrates a lack of the clear background of analysis theories. Because the top-down construction method would adopt the basement floor as an earthretaining structure used in the event of excavation projects, this method can measure more up to conditions for the plane strain analysis than does the top-down construction method. To probe further into the real activities of top-down construction, this study will take as its case the top-down construction (with the depth of excavation at about G.L-17.56 m) of a certain large area approximately 335 m ( length)× 130 m ( width) in the Kaohsiung city that has been analyzed by way of the RIDO program in the original design, where the PLAXIS, a two-dimensional finite element analysis method, will be applied to simulate the analysis of peer conditions, which is based both on the Mohr-Coulomb and Soft-Soil Model, and where the numerical simulation of excavation process will be fulfilled on the basis of on-site conditions and in view of such factors as base excavating depth, base excavating shape, support system deployment and soil layer demarcation, etc. Meanwhile, the mesh boundary condition shall be postulated to be the absence of neither the horizontal nor lateral displacement beyond the areas of excavation influence unless such cases as the deflection of retaining walls or ground surface settlement (troughs) are discussed, and shall be compared and analyzed with the on-site observational data.
component Plane strain Top-down construction method RIDO Finite element method PLAXIS
Cheng-Tao Ho Shong-Loong Chen
Ph. D. Candidate, Graduate Institute of Engineering Technology, National Taipei University of Techno Associate Professor , Graduate Institute of Civil and Disaster Prevention Engineering, National Taip
国际会议
三峡
英文
1074-1078
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）