3D CPT-based Stratification Reconstruction Using Cluster Analysis

• Main Authors: Yi-Quan Chen, 陳奕全
• Other Authors: Jianye Ching
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/8v3677

碩士 === 國立臺灣大學 === 土木工程學研究所 === 105 === Cone Penetration Test with Pore Pressure Measurement(CPTu) is one of the most popular in-situ test recently. Soil engineering properties can be determined and subsurface stratification can be assessed from the CPTu data. In more details, CPTu data is transformed into soil type variable, Ic. The corresponding soil type classification is available. (Robertson 1990) Ching et al. (2015) proposed a single sounding CPTu stratification algorithm using Wavelet Transform Modulus Maxima (WTMM). It can capture the depth of which Ic changes dramatically relative to that of the nearby depth, and this depth is regarded as the soil boundary surface. Because of the fact that soil layer unit or soil boundary surface is in 3-dimensional form, the multiple sounding CPTu data with WTMM results should contain the information of 3D soil stratification, giving the motivation of this study. This study tries to reconstruct 3D stratification using cluster analysis and is based on WTMM results. Agglomerative hierarchical clustering is used. Additional constraints, Monte Carlo Simulation, Optimization are added to make this algorithm more suitable for the stratification problem.