(1. Department of Applied Mechanics and Engineering，Sun Yat-Sen University，Guangzhou，Guangdong 510275，China；
2. Guangzhou Urban Planning Survey and Design Institute，Guangzhou，Guangdong 510060，China；
3. Department of Earth Sciences，Sun Yat-Sen University，Guangzhou，Guangdong 510275，China)
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.
张鹏程1，2，汤连生1，3，姜力群3，邓钟尉3. 基质吸力与含水量及干密度定量关系研究[J]. 岩石力学与工程学报, 2013, 32(s1): 2792-2797.
ZHANG Pengcheng1，2，TANG Liansheng1，3，JIANG Liqun3，DENG Zhongwei3. RESEARCH OF QUANTITATIVE RELATIONS OF MATRIC SUCTION WITH WATER CONTENT AND DRY DENSITY. , 2013, 32(s1): 2792-2797.
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2013, Vol. 32 
