| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災研究所 === 94 === Soil water characteristic curve (SWCC) is an important function of unsaturated soil. It defines the volumetric water content corresponding to a particular suction in the soil. In addition, relationships exist between SWCC and hydraulic property of unsaturated soil; as a result conventional method used in measuring unsaturated hydraulic property, which is expensive, time consuming, and labor intensive, can be replaced by the more economical back analysis of the SWCC. However, before this can be done, it is necessary to have a database of the SWCC of local soils. Performing SWCC laboratory tests for all the local soils is tedious. Several methods (Arya and Paris, 1981; Tyler and Wheatcraft, 1989 and Aubertin et al., 2003) have been made to estimate the SWCC relationships from available soil properties such as particle-size distribution, bulk density, void rate and liquid limit. The estimation methods used are referred to as pedo-transfer function (PTF).
In this study, eight PTFs proposed by Gupta and Larson (1975), Fredlund et al. (1997), Vereecken et al. (1989), Scheinost et al. (1997), Arya and Paris (1981), Tyler and Wheatcraft (1989), Zhuang et al. (2001) and Aubertin (2003) have been used and analyzed for various Taiwan soils with different textures such as SM, CL, CH, ML and MH soils. The PTF estimation results were compared with the experimental SWCC results. Improvement has been made to the methods proposed by Gupta and Larson (1975), Arya and Paris (1981), Fredlund et al. (1997) and Scheinost et al. (1997) and better estimations of SWCC for the above soils have been obtained.
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