Calculation of coefficient of compressibility for air-water mixture in gassy soils
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摘要: 气相封闭的含气泡土是一种特殊的非饱和土类型,其孔隙流体压缩性不可忽略。以小气泡概念模型假设为基础,基于理想气体变形的Bolye定律及表面张力作用等基础理论,推导分析了含封闭气泡土体孔隙混合流体的压缩系数Cgw不同计算公式。针对水饱和度较高时已有研究公式的不完善性,采用将溶于水的气体和水作为整体确定其压缩系数的处理思路,在此基础上提出了一种Cgw的计算方法,并将不同水饱和度下的计算结果与其他计算方法进行对比研究,分析了其合理性和适用性,还分析了孔隙混合流体压缩系数公式中相关参数变化规律及其对计算结果的影响。Abstract: The gassy soil containing entrapped gas bubbles is a special type of unsaturated soils, and the compressibility of air-water mixture in gassy soils cannot be ignored. Based on the conceptual model for small bubbles, the Bolye’s law of ideal gas and the surface tension effects, equations of the coefficient of compressibility for air-water mixture are derived. When the saturation is higher, the existing equations are not applicable, so a new method for Cgw is proposed, which treats the water and the gas dissolved in the water as a whole. The calculated results under different water saturations are compared with those of other existing methods. The comparitive results show that the proposed method is more reasonable. Finally, the variation characteristics and the impact on the calculated results of the related parameters in the new equation are also analyzed.
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[1] NAGESWARAN S. Effect of gas bubbles on the sea bed behavior[D]. Oxford: The University of Oxford, 1983. [2] THOMAS S D. The consolidation behaviour of gassy soil[D]. Oxford: The University of Oxford, 1987. [3] 魏海云, 詹良通, 陈云敏. 高饱和度土的压缩和固结特性及其应用[J]. 岩土工程学报, 2006, 28(2): 264-269. (WEI Hai-yun, ZHAN Liang-tong, CHEN Yun-min. Compressibility and consolidation of unsaturated soils with high degree of saturation and its application[J].Chinese Journal of Geotechnical Engineering, 2006, 28(2): 264-269. (in Chinese)) [4] 徐浩峰. 含生物气非饱和软土的固结理论研究[D]. 杭州:浙江大学, 2011. (XU Hao-feng. Studies on the consolidation theory for unsaturated soft soils containing biogas[D]. Hangzhou: Zhejiang University, 2011. (in Chinese)) [5] WHEELER S J. The undrained shear strength of soils containing large gas bubbles[J]. Géotechnique, 1988, 38(3): 399-413. [6] PIETRUSZCZAK S, PANDE G N. Constitutive relations for partially saturated soils containing gas inclusions[J]. Journal of Geotechnical Engineering, 1996, 122(1): 50-59. [7] FREDLUND D G, RAHARDJO H, FREDLUND M D. Unsaturated soil mechanics in engineering practice[M]. New York: John Wiley & Sons, 2012. [8] SCHUURMAN I E. The compressibility of an air/water mixture and a theoretical relation between the air and water pressures[J]. Géotechnique, 1966, 16(4): 269-281. [9] BISHOP A W, HENKEL D J. The measurement of soil properties in the triaxial test[M]. 2nd ed. London: Edward Arnold, 1962. [10] DORSEY N E. Properties of ordinary water-substance[M]. New York: Reinhold Publishing Corporation, 1940.
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