But in phase diagram – for understanding, these three matters are shown separately. Download. Introduction to geotechnical engineering : unsaturated and saturated soils / Jean-Louis Briaud. Degree of saturation for this soil sample is defined as volume of water to the volume of voids this soil sample contains. But, when the soil mass is partially saturated, its void space will be filled up by water as well as air. In the figures, weight of air (W a) is assumed to be zero. Such diagrammatic representation of separated different phases of soil mass is called phase diagram. Hazardous Waste Management. The representation of different phases of soil with diagrams is called as phase diagram. Figure 2.1(b) and Figure 2.1(c) show the phase diagram of completely saturated (two-phase system: solid and water) and dry soil (two-phase system: solid and air), respectively. Phase Diagram. Soil Phase Relations. So there is a three phase system, but when the voids are only filled with air, or only filled with water then soil becomes a two phase system. Total volume of the soil mass, V = (Va+Vw) +Vs. Soil is a three phase material which consists of solid particles which make up the soil skeleton and voids which may be full of water if the soil is saturated, may be full of air if the soil is dry, or may be partially saturated as shown in Figure 1. saturated soil, the voids are filled with water only whereas, incase of completely dry soil voids are filled with air only. References - Books: Michael D. LaGrega, Phillip L. Buckingham and Jeffery C. Evan. Soil Phase Relations. 1994. Soil deposits consist of the soil particles and the void space between the particles. Soil mass is in general a three-phase system composed of solid, liquid and gaseous matter in a blended form with each other. When the voids are only filled with water, it is said to be saturated. Soil mass is generally referred to as three-phase system because it consists of solid particles, liquid, and gas.For many civil engineering purposes, the liquid may be considered to be water and the gas as air (Figure 1 and 2) with the exception geoenvironmental, and oil and gas applications. In case of partially saturated soil, the voids are filled with both water and air. Soil Modulus 184 9.4.1 Saturated Soils 184 9.4.2 Unsaturated Soils 184 9.5 Consolidation Test 185 Construct a phase diagram for a sample of saturated soil using the observations recorded for Phase Diagram 1, however, assume that the specific gravity of the soil solids is 2.70. McGraw Hill, Inc. ... Soils S W A : Solid : Liquid : Air Soil particle Water (electrolytes) Air 6 Three Phase Diagram AIR WATER SOLID 7 Two Phase Diagram Fully Saturated Soils WATER SOLID 8 Two Phase Diagram (Oven) Dry Soils WATER SOLID AIR 9 Three Phase Diagram Dry Unit Weight 2. Solid Water Air Figure 1: Air, Water and Solid phases in a typical soil The soil will behave as a two-phase system when its void space is filled by either water or air alone.Such condition is possible when the soil is either fully saturated or fully dry.. Three-Phase Diagram of Soil. Two-Phase Diagram of Soil. Based on the data determine the following quantities from Phase Diagram 3: (i) void ratio; (ii) porosity; (iii) saturation (iv) dry mass density; (v) mass density; and (vi) water content. Figure 2.1(a) shows the phase diagram of partially saturated soil (three-phase system: solid, water and air). Vv voids W-18% Vs solids A) 0.25 B) 0.49 C) 1.90 D) 3.00 Let us consider the 3 phase diagram of a partially saturated soil. 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