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Abstract Referring to the concept of coordination number in crystallography and mineralogical science and powder material science and engineering，based on the formulas of Smith，Fisher and Young-Laplace，the corresponding relationship between macro variables such as water content，dry density，void ratio and micro variables such as saturation angle，volume between two soil particles，the quantitative calculation formula of matric suction is deduced. Calculation results show that：(1) Matric suction of unsaturated soil decreases with the increasing water content nonlinearly. (2) There is a linear correlation between matric suction and dry density，as well as void ratio. Matric suction increases with the increasing dry density at low water content while keeps no changes at high water content. The calculation result matches existing experimental results.
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Received: 04 November 2011
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2013, Vol. 32 
