以基本土壤特性評估土壤水份特徵曲線

Estimation of SWCC for various Textures Soils from Soil Physical Properties

張育誠(Yu-Cheng Chang)

指導教授 ： 魏敏樺

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00237

摘要

土壤水份特徵曲線(soil-water characteristic curve, SWCC)對於非飽和土壤是一個重要的特性函數，由特定的基質吸力所對應於體積含水量之函數關係。此外，非飽和土壤存在於有關SWCC和水力特性，一般量測非飽和水力特性是昂貴且耗時又費力，可從較經濟的方法去取代評估SWCC，但在這之前必需建立屬於本地的SWCC之資料庫。實作SWCC實驗是比較冗長且乏味的，有幾個方法(Arya and Paris, 1981; Tyler and Wheatcraft, 1989 and Aubertin et al., 2003)可以去評估SWCC從一些基本的土壤性質，例如: 粒徑分佈曲線、體積密度、孔隙比和液性限度…等，這些評估的方法總稱為土壤轉換函數(pedo-transfer function, PTF)。
本研究探討八個PTFs方法有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)和Aubertin (2003)等，使用去評估臺灣不同質地有SM、CL、CH、ML和MH等土壤，且與實驗的結果作比較。然而根據Gupta and Larson (1975), Arya and Paris (1981), Fredlund et al. (1997)和Scheinost et al. (1997) 此四種方法進行修正，使其在評估上可獲得較佳的SWCC曲線。

關鍵字

非飽和土壤 ； 基質吸力 ； 土壤水份特徵曲線 ； PTF ； SWCC.

並列摘要

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.

並列關鍵字

unsaturated soil ； matric suction ； particle size distribution ； SWCC ； PTF

參考文獻

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